Browsing by Author "Aaij R."
  • Institution Publication
    A model-independent measurement of the CKM angle γ in partially reconstructed B± → D*h± decays with D → KS0h+h− (h = π, K)
    ( 2024-02-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Bailly-reyre A.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    A measurement of CP-violating observables in B± → D*K± and B± → D*π± decays is made where the photon or neutral pion from the D*→ Dγ or D*→ Dπ0 decay is not reconstructed. The D meson is reconstructed in the self-conjugate decay modes, D → KS0π+π− or D → KS0K+K−. The distribution of signal yields in the D decay phase space is analysed in a model-independent way. The measurement uses a data sample collected in proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of approximately 9 fb−1. The B± → D*K± and B± → D*π±CP-violating observables are interpreted in terms of hadronic parameters and the CKM angle γ, resulting in a measurement of γ = (92−17+21)°. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.
  • Institution Publication
    Amplitude analysis and branching fraction measurement of B+→D∗−Ds+π+ decays
    ( 2024-08-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adams J.A.
    ;
    Adefisoye A.A.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Bao H.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barnyakov M.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartz J.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    ;
    Bocharnikov V.
    The decays of the B+ meson to the final state D∗−Ds+π+ are studied in proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1. The ratio of branching fractions of the B+→D∗−Ds+π+ and B0→D∗−Ds+ decays is measured to be 0.173 ± 0.006 ± 0.010, where the first uncertainty is statistical and the second is systematic. Using partially reconstructed Ds∗+→Ds+γ and Ds+π0 decays, the ratio of branching fractions between the B+→D∗−Ds∗+π+ and B+→D∗−Ds+π+ decays is determined as 1.31 ± 0.07 ± 0.14. An amplitude analysis of the B+→D∗−Ds+π+ decay is performed for the first time, revealing dominant contributions from known excited charm resonances decaying to the D*−π+ final state. No significant evidence of exotic contributions in the Ds+π+ or D∗−Ds+ channels is found. The fit fraction of the scalar state Tcs¯0∗2900++ observed in the B+→D−Ds+π+ decay is determined to be less than 2.3% at a 90% confidence level.
  • Institution Publication
    Amplitude analysis and branching fraction measurement of B+→D∗−Ds+π+ decays
    ( 2024-08-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adams J.A.
    ;
    Adefisoye A.A.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Bao H.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barnyakov M.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartz J.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    ;
    Bocharnikov V.
    The decays of the B+ meson to the final state D∗−Ds+π+ are studied in proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1. The ratio of branching fractions of the B+→D∗−Ds+π+ and B0→D∗−Ds+ decays is measured to be 0.173 ± 0.006 ± 0.010, where the first uncertainty is statistical and the second is systematic. Using partially reconstructed Ds∗+→Ds+γ and Ds+π0 decays, the ratio of branching fractions between the B+→D∗−Ds∗+π+ and B+→D∗−Ds+π+ decays is determined as 1.31 ± 0.07 ± 0.14. An amplitude analysis of the B+→D∗−Ds+π+ decay is performed for the first time, revealing dominant contributions from known excited charm resonances decaying to the D*−π+ final state. No significant evidence of exotic contributions in the Ds+π+ or D∗−Ds+ channels is found. The fit fraction of the scalar state Tcs¯0∗2900++ observed in the B+→D−Ds+π+ decay is determined to be less than 2.3% at a 90% confidence level.
  • Institution Publication
    Amplitude Analysis of B± →π±K+K- Decays
    ( 2019-12-06)
    Aaij R.
    ;
    Abellán Beteta C.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Aidala C.A.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Alkhazov G.
    ;
    Alvarez Cartelle P.
    ;
    Alves A.A.
    ;
    Amato S.
    ;
    Amerio S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andreassi G.
    ;
    Andreotti M.
    ;
    Andrews J.E.
    ;
    Archilli F.
    ;
    Arnau Romeu J.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Arzymatov K.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Back J.J.
    ;
    Baker S.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baranov A.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Baryshnikov F.
    ;
    Batozskaya V.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Battista V.
    ;
    Bay A.
    ;
    Beddow J.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Beiter A.
    ;
    Bel L.J.
    ;
    Belin S.
    ;
    Beliy N.
    ;
    Bellee V.
    ;
    Belloli N.
    ;
    Belous K.
    ;
    Belyaev I.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Benson S.
    ;
    Beranek S.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bertholet E.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Betti F.
    ;
    Bettler M.O.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Birnkraut A.
    ;
    Bizzeti A.
    ;
    Bjørn M.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Bocci V.
    ;
    Boente Garcia O.
    ;
    Boettcher T.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Borghi S.
    ;
    Borghi S.
    ;
    Borisyak M.
    ;
    Borsato M.
    ;
    Boubdir M.
    ;
    Bowcock T.J.V.
    ;
    Bozzi C.
    ;
    Bozzi C.
    ;
    Braun S.
    ;
    Brodski M.
    ;
    Brodzicka J.
    ;
    Brossa Gonzalo A.
    ;
    Brundu D.
    ;
    Brundu D.
    The first amplitude analysis of the B±→π±K+K- decay is reported based on a data sample corresponding to an integrated luminosity of 3.0 fb-1 of pp collisions recorded in 2011 and 2012 with the LHCb detector. The data are found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from ππ↔KK S-wave rescattering. The dominant contributions in the π± K and K+ K- systems are the nonresonant and the B±→ρ(1450)0π± amplitudes, respectively, with fit fractions around 30%. For the rescattering contribution, a sizable fit fraction is observed. This component has the largest CP asymmetry reported to date for a single amplitude of (-66±4±2)%, where the first uncertainty is statistical and the second systematic. No significant CP violation is observed in the other contributions.
  • Institution Publication
    Amplitude analysis of the B+ →π+π+π- decay
    ( 2020-01-21)
    Aaij R.
    ;
    Beteta C.A.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Aidala C.A.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Albero A.A.
    ;
    Alkhazov G.
    ;
    Cartelle P.A.
    ;
    Alves A.A.
    ;
    Amato S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andreassi G.
    ;
    Andreotti M.
    ;
    Andrews J.E.
    ;
    Archilli F.
    ;
    Romeu J.A.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Arzymatov K.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Back J.J.
    ;
    Baker S.
    ;
    Balagura V.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baldini W.
    ;
    Baranov A.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Baryshnikov F.
    ;
    Batozskaya V.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Battista V.
    ;
    Bay A.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Beiter A.
    ;
    Bel L.J.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Beliy N.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belyaev I.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Benson S.
    ;
    Beranek S.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bertholet E.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Betti F.
    ;
    Bettler M.O.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Birnkraut A.
    ;
    Bizzeti A.
    ;
    Bizzeti A.
    ;
    Bjørn M.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Bocci V.
    ;
    Garcia O.B.
    ;
    Boettcher T.
    ;
    Boldyrev A.
    ;
    Boldyrev A.
    ;
    Bondar A.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Borghi S.
    ;
    Borghi S.
    ;
    Borisyak M.
    ;
    Borsato M.
    ;
    Boubdir M.
    ;
    Bowcock T.J.V.
    ;
    Bozzi C.
    ;
    Bozzi C.
    ;
    Braun S.
    ;
    Rodriguez A.B.
    ;
    Brodski M.
    ;
    Brodzicka J.
    ;
    Gonzalo A.B.
    ;
    Brundu D.
    ;
    Brundu D.
    The results of an amplitude analysis of the charmless three-body decay B+→π+π+π-, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3 fb-1 of pp collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behavior of the π+π- S-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the ρ(770)0, ω(782) and ρ(1450)0 resonances in the π+π- P-wave, the f2(1270) resonance in the π+π- D-wave, and the ρ3(1690)0 resonance in the π+π- F-wave. Significant CP-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of CP-violation effects in B+→π+π+π- decays.
  • Institution Publication
    Amplitude Analysis of the B0 →k∗0μ+μ- Decay
    ( 2024-03-29)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Bailly-Reyre A.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista De Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    An amplitude analysis of the B0→K∗0μ+μ- decay is presented using a dataset corresponding to an integrated luminosity of 4.7 fb-1 of pp collision data collected with the LHCb experiment. For the first time, the coefficients associated to short-distance physics effects, sensitive to processes beyond the standard model, are extracted directly from the data through a q2-unbinned amplitude analysis, where q2 is the μ+μ- invariant mass squared. Long-distance contributions, which originate from nonfactorizable QCD processes, are systematically investigated, and the most accurate assessment to date of their impact on the physical observables is obtained. The pattern of measured corrections to the short-distance couplings is found to be consistent with previous analyses of b- to s-quark transitions, with the largest discrepancy from the standard model predictions found to be at the level of 1.8 standard deviations. The global significance of the observed differences in the decay is 1.4 standard deviations.
  • Institution Publication
    Amplitude Analysis of the B0 →k∗0μ+μ- Decay
    ( 2024-03-29)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Bailly-Reyre A.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista De Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    An amplitude analysis of the B0→K∗0μ+μ- decay is presented using a dataset corresponding to an integrated luminosity of 4.7 fb-1 of pp collision data collected with the LHCb experiment. For the first time, the coefficients associated to short-distance physics effects, sensitive to processes beyond the standard model, are extracted directly from the data through a q2-unbinned amplitude analysis, where q2 is the μ+μ- invariant mass squared. Long-distance contributions, which originate from nonfactorizable QCD processes, are systematically investigated, and the most accurate assessment to date of their impact on the physical observables is obtained. The pattern of measured corrections to the short-distance couplings is found to be consistent with previous analyses of b- to s-quark transitions, with the largest discrepancy from the standard model predictions found to be at the level of 1.8 standard deviations. The global significance of the observed differences in the decay is 1.4 standard deviations.
  • Institution Publication
    Amplitude analysis of the Ds+ → π − π + π + decay
    ( 2023-07-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Afsharnia H.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Bailly-reyre A.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Berninghoff D.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bian L.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Boelhauve J.A.
    ;
    Boente Garcia O.
    A Dalitz plot analysis of the Ds+ → π − π + π + decay is presented. The analysis is based on proton-proton collision data recorded by the LHCb experiment at a centre-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 1.5 fb −1. The resonant structure of the decay is obtained using a quasi-model-independent partial-wave analysis, in which the π + π − S-wave amplitude is parameterised as a generic complex function determined by a fit to the data. The S-wave component is found to be dominant, followed by the contribution from spin-2 resonances and a small contribution from spin-1 resonances. The latter includes the first observation of the Ds+ → ω(782)π + channel in the Ds+ → π − π + π + decay. The resonant structures of the Ds+ → π − π + π + and D + → π − π + π + decays are compared, providing information about the mechanisms for the hadron formation in these decays. [Figure not available: see fulltext.].
  • Institution Publication
    Analysis of Neutral (Formula Presented)-Meson Decays into Two Muons
    ( 2022-01-28)
    Aaij R.
    ;
    Abellán Beteta C.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Afsharnia H.
    ;
    Aidala C.A.
    ;
    Aiola S.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alkhazov G.
    ;
    Alvarez Cartelle P.
    ;
    Amato S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andreianov A.
    ;
    Andreotti M.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Arzymatov K.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista Leite J.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Beiter A.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bian L.
    ;
    Bieker M.S.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Bizzeti A.
    ;
    Bjørn M.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Boelhauve J.A.
    ;
    Boente Garcia O.
    ;
    Boettcher T.
    ;
    Boldyrev A.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Bondar N.
    ;
    Borghi S.
    ;
    Borisyak M.
    ;
    Borsato M.
    ;
    Borsuk J.T.
    ;
    Bouchiba S.A.
    ;
    Bowcock T.J.V.
    ;
    Boyer A.
    ;
    Bozzi C.
    ;
    Bradley M.J.
    ;
    Braun S.
    Branching fraction and effective lifetime measurements of the rare decay Formula Presented and searches for the decays Formula Presented and Formula Presented are reported using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a luminosity of Formula Presented. The branching fraction Formula Presented and the effective lifetime Formula Presented are measured, where the first uncertainty is statistical and the second systematic. No significant signal for Formula Presented and Formula Presented decays is found and upper limits Formula Presented and Formula Presented at the 95% C.L. are determined, where the latter is limited to the range Formula Presented. The results are in agreement with the standard model expectations.
  • Institution Publication
    Analysis of Neutral (Formula Presented)-Meson Decays into Two Muons
    ( 2022-01-28)
    Aaij R.
    ;
    Abellán Beteta C.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Afsharnia H.
    ;
    Aidala C.A.
    ;
    Aiola S.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alkhazov G.
    ;
    Alvarez Cartelle P.
    ;
    Amato S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andreianov A.
    ;
    Andreotti M.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Arzymatov K.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista Leite J.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Beiter A.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bian L.
    ;
    Bieker M.S.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Bizzeti A.
    ;
    Bjørn M.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Boelhauve J.A.
    ;
    Boente Garcia O.
    ;
    Boettcher T.
    ;
    Boldyrev A.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Bondar N.
    ;
    Borghi S.
    ;
    Borisyak M.
    ;
    Borsato M.
    ;
    Borsuk J.T.
    ;
    Bouchiba S.A.
    ;
    Bowcock T.J.V.
    ;
    Boyer A.
    ;
    Bozzi C.
    ;
    Bradley M.J.
    ;
    Braun S.
    Branching fraction and effective lifetime measurements of the rare decay Formula Presented and searches for the decays Formula Presented and Formula Presented are reported using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a luminosity of Formula Presented. The branching fraction Formula Presented and the effective lifetime Formula Presented are measured, where the first uncertainty is statistical and the second systematic. No significant signal for Formula Presented and Formula Presented decays is found and upper limits Formula Presented and Formula Presented at the 95% C.L. are determined, where the latter is limited to the range Formula Presented. The results are in agreement with the standard model expectations.
  • Institution Publication
    Angular analysis of charged and neutral B → Kµ+µ- decays
    ( 2014-01-01)
    Aaij R.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Affolder A.
    ;
    Ajaltouni Z.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Ali S.
    ;
    Alkhazov G.
    ;
    Alvarez Cartelle P.
    ;
    Alves A.A.
    ;
    Alves A.A.
    ;
    Amato S.
    ;
    Amerio S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Anderlini L.
    ;
    Anderson J.
    ;
    Andreassen R.
    ;
    Andreotti M.
    ;
    Andreotti M.
    ;
    Andrews J.E.
    ;
    Appleby R.B.
    ;
    Aquines Gutierrez O.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Auriemma G.
    ;
    Auriemma G.
    ;
    Baalouch M.
    ;
    Bachmann S.
    ;
    Back J.J.
    ;
    Badalov A.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Barlow R.J.
    ;
    Barschel C.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Batozskaya V.
    ;
    Bauer T.
    ;
    Bay A.
    ;
    Beddow J.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Belogurov S.
    ;
    Belous K.
    ;
    Belyaev I.
    ;
    Ben-Haim E.
    ;
    Bencivenni G.
    ;
    Benson S.
    ;
    Benton J.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bettler M.O.
    ;
    van Beuzekom M.
    ;
    Bien A.
    ;
    Bifani S.
    ;
    Bird T.
    ;
    Bizzeti A.
    ;
    Bizzeti A.
    ;
    Bjørnstad P.M.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blouw J.
    ;
    Blusk S.
    ;
    Bocci V.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Bondar N.
    ;
    Bonivento W.
    ;
    Bonivento W.
    ;
    Borghi S.
    ;
    Borgia A.
    ;
    Borsato M.
    ;
    Bowcock T.J.V.
    ;
    Bowen E.
    ;
    Bozzi C.
    ;
    Brambach T.
    ;
    van den Brand J.
    ;
    Bressieux J.
    ;
    Brett D.
    ;
    Britsch M.
    ;
    Britton T.
    ;
    Brook N.H.
    ;
    Brown H.
    ;
    Bursche A.
    ;
    Busetto G.
    ;
    Busetto G.
    ;
    Buytaert J.
    ;
    Cadeddu S.
    ;
    Calabrese R.
    ;
    Calabrese R.
    ;
    Callot O.
    ;
    Calvi M.
    ;
    Calvi M.
    ;
    Calvo Gomez M.
    ;
    Calvo Gomez M.
    ;
    Camboni A.
    ;
    Campana P.
    ;
    Campana P.
    ;
    Campora Perez D.
    ;
    Carbone A.
    ;
    Carboni G.
    ;
    Cardinale R.
    ;
    Cardinale R.
    ;
    Cardinale R.
    ;
    Cardini A.
    ;
    Carranza-Mejia H.
    ;
    Carson L.
    ;
    Carvalho Akiba K.
    The angular distributions of the rare decays B → K+µ+µ- and B0 → K0 aSμ+μ- are studied with data corresponding to 3 fb-1 of integrated luminosity, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies with the LHCb detector. The angular distribution is described by two parameters, FH and the forward-backward asymmetry of the dimuon system AFB, which are determined in bins of the dimuon mass squared. The parameter FH is a measure of the contribution from (pseudo)scalar and tensor amplitudes to the decay width. The measurements of AFB and FH reported here are the most precise to date and are compatible with predictions from the Standard Model.
  • Institution Publication
    Branching fraction measurement of the decay B+ →ψ (2S)φ (1020)K+
    ( 2025-05-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adefisoye A.A.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Ataíde Da Silva R.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Balboni A.
    ;
    Baldini W.
    ;
    Balzani L.
    ;
    Bao H.
    ;
    Baptista De Souza Leite J.
    ;
    Barbero Pretel C.
    ;
    Barbero Pretel C.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barnyakov M.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartz J.
    ;
    Basels J.M.
    ;
    Bashir S.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battista P.B.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Behling N.A.
    ;
    Belin S.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    The branching fraction of the decay B+→ψ(2S)φ(1020)K+, relative to the topologically similar decay B+→J/ψφ(1020)K+, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The ratio is found to be 0.061±0.004±0.009, where the first uncertainty is statistical and the second systematic. Using the world-average branching fraction for B+→J/ψφ(1020)K+, the branching fraction for the decay B+→ψ(2S)φ(1020)K+ is found to be (3.0±0.2±0.5±0.2)×10-6, where the first uncertainty is statistical, the second systematic, and the third is due to the branching fraction of the normalization channel.
  • Institution Publication
    Centrality determination in heavy-ion collisions with the LHCb detector
    ( 2022-05-01)
    Aaij R.
    ;
    Beteta C.A.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Afsharnia H.
    ;
    Aidala C.A.
    ;
    Aiola S.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Albero A.A.
    ;
    Aliouche Z.
    ;
    Alkhazov G.
    ;
    Cartelle P.A.
    ;
    Amato S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andreianov A.
    ;
    Andreotti M.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Arzymatov K.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baker S.
    ;
    Rodriguez P.B.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baldini W.
    ;
    Leite J.B.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Batozskaya V.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Beiter A.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertholet E.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Betti F.
    ;
    Bettler M.O.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bian L.
    ;
    Bieker M.S.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bizzeti A.
    ;
    Bizzeti A.
    ;
    Bjørn M.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Boelhauve J.A.
    ;
    Garcia O.B.
    ;
    Boettcher T.
    ;
    Boldyrev A.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Borghi S.
    ;
    Borisyak M.
    ;
    Borsato M.
    ;
    Borsuk J.T.
    ;
    Bouchiba S.A.
    ;
    Bowcock T.J.V.
    ;
    Boyer A.
    The centrality of heavy-ion collisions is directly related to the created medium in these interactions. A procedure to determine the centrality of collisions with the LHCb detector is implemented for lead-lead collisions at √s NN = 5 TeV and lead-neon fixed-target collisions at √s NN = 69 GeV. The energy deposits in the electromagnetic calorimeter are used to determine and define the centrality classes. The correspondence between the number of participants and the centrality for the lead-lead collisions is in good agreement with the correspondence found in other experiments, and the centrality measurements for the lead-neon collisions presented here are performed for the first time in fixed-target collisions at the LHC.
  • Institution Publication
    Charmonium production in pNe collisions at √sNN=68.5 GeV
    ( 2023-07-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Beteta C.A.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Afsharnia H.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Aiola S.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Bailly-reyre A.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bian L.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Boelhauve J.A.
    ;
    Boente Garcia O.
    ;
    Boettcher T.
    ;
    Boldyrev A.
    The measurement of charmonium states produced in proton-neon (pNe) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of J/ψ and ψ(2 S) mesons is studied with a beam of 2.5 TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy sNN=68.5GeV . The data sample corresponds to an integrated luminosity of 21.7 ± 1.4 nb - 1 . The J/ψ and ψ(2 S) hadrons are reconstructed in μ+μ- final states. The J/ψ production cross-section per target nucleon in the centre-of-mass rapidity range y⋆∈ [- 2.29 , 0] is found to be 506±8±46nb/nucleon . The ratio of J/ψ and D cross-sections is evaluated to (1.06 ± 0.02 ± 0.09) % . The ψ(2 S) to J/ψ relative production rate is found to be (1.67 ± 0.27 ± 0.10) % in good agreement with other measurements involving beam and target nuclei of similar sizes.
  • Institution Publication
    Comprehensive analysis of local and nonlocal amplitudes in the B0→ K*0μ+μ− decay
    ( 2024-09-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinén F.
    ;
    Ackernley T.
    ;
    Adefisoye A.A.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Ataide Da Silva R.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Bao H.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barnyakov M.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartz J.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    ;
    Bocharnikov V.
    ;
    Boelhauve J.A.
    ;
    Boente Garcia O.
    A comprehensive study of the local and nonlocal amplitudes contributing to the decay B0 → K*0(→ K+π−)μ+μ− is performed by analysing the phase-space distribution of the decay products. The analysis is based on pp collision data corresponding to an integrated luminosity of 8.4 fb−1 collected by the LHCb experiment. This measurement employs for the first time a model of both one-particle and two-particle nonlocal amplitudes, and utilises the complete dimuon mass spectrum without any veto regions around the narrow charmonium resonances. In this way it is possible to explicitly isolate the local and nonlocal contributions and capture the interference between them. The results show that interference with nonlocal contributions, although larger than predicted, only has a minor impact on the Wilson Coefficients determined from the fit to the data. For the local contributions, the Wilson Coefficient C9, responsible for vector dimuon currents, exhibits a 2.1σ deviation from the Standard Model expectation. The Wilson Coefficients C10, C9′ and C10′ are all in better agreement than C9 with the Standard Model and the global significance is at the level of 1.5σ. The model used also accounts for nonlocal contributions from B0→ K*0[τ+τ−→ μ+μ−] rescattering, resulting in the first direct measurement of the bsττ vector effective-coupling C9τ.
  • Institution Publication
    Constraints on the KS0 →μ+μ- Branching Fraction
    ( 2020-12-02)
    Aaij R.
    ;
    Beteta C.A.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Afsharnia H.
    ;
    Aidala C.A.
    ;
    Aidala C.A.
    ;
    Aiola S.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Albero A.A.
    ;
    Alkhazov G.
    ;
    Cartelle P.A.
    ;
    Alves A.A.
    ;
    Amato S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andreassi G.
    ;
    Andreotti M.
    ;
    Archilli F.
    ;
    Romeu J.A.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Arzymatov K.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bachmann S.
    ;
    Back J.J.
    ;
    Baker S.
    ;
    Balagura V.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baldini W.
    ;
    Baranov A.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartolini M.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Bassi G.
    ;
    Batozskaya V.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Beiter A.
    ;
    Bel L.J.
    ;
    Belavin V.
    ;
    Belin S.
    ;
    Beliy N.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belyaev I.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Benson S.
    ;
    Beranek S.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Berninghoff D.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertholet E.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Betti F.
    ;
    Bettler M.O.
    ;
    Bezshyiko I.
    ;
    Bhasin S.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Bifani S.
    ;
    Billoir P.
    ;
    Bizzeti A.
    ;
    Bizzeti A.
    ;
    Bjørn M.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blusk S.
    ;
    Bobulska D.
    ;
    Bocci V.
    ;
    Garcia O.B.
    ;
    Boettcher T.
    ;
    Boldyrev A.
    ;
    Boldyrev A.
    ;
    Bondar A.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Borghi S.
    ;
    Borghi S.
    ;
    Borisyak M.
    ;
    Borsato M.
    ;
    Borsuk J.T.
    ;
    Bowcock T.J.V.
    ;
    Bozzi C.
    ;
    Bradley M.J.
    ;
    Braun S.
    A search for the decay KS0→μ+μ- is performed using proton-proton collision data, corresponding to an integrated luminosity of 5.6 fb-1 and collected with the LHCb experiment during 2016, 2017, and 2018 at a center-of-mass energy of 13 TeV. The observed signal yield is consistent with zero, yielding an upper limit of B(KS0→μ+μ-)<2.2×10-10 at 90% C.L.. The limit reduces to B(KS0→μ+μ-)<2.1×10-10 at 90% C.L. once combined with the result from data taken in 2011 and 2012.
  • Institution Publication
    Curvature-bias corrections using a pseudomass method
    ( 2024-03-01)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinen F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.
    ;
    Anelli A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista de Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Bartz J.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    ;
    Blusk S.
    ;
    Bobulska D.
    Momentum measurements for very high momentum charged particles, such as muons from electroweak vector boson decays, are particularly susceptible to charge-dependent curvature biases that arise from misalignments of tracking detectors. Low momentum charged particles used in alignment procedures have limited sensitivity to coherent displacements of such detectors, and therefore are unable to fully constrain these misalignments to the precision necessary for studies of electroweak physics. Additional approaches are therefore required to understand and correct for these effects. In this paper the curvature biases present at the LHCb detector are studied using the pseudomass method in proton-proton collision data recorded at centre of mass energy √s = 13 TeV during 2016, 2017 and 2018. The biases are determined using Z → μ+μ- decays in intervals defined by the data-taking period, magnet polarity and muon direction. Correcting for these biases, which are typically at the 10-4 GeV-1 level, improves the Z → μ+μ- mass resolution by roughly 18% and eliminates several pathological trends in the kinematic-dependence of the mean dimuon invariant mass.
  • Institution Publication
    Dalitz plot analysis of Bs0 → D ¯ 0K-π+ decays Dalitz plot analysis of ... R. Aaij et al.
    ( 2014-10-14)
    Aaij R.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Affolder A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Ali S.
    ;
    Alkhazov G.
    ;
    Alvarez Cartelle P.
    ;
    Alves A.A.
    ;
    Alves A.A.
    ;
    Amato S.
    ;
    Amerio S.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Anderson J.
    ;
    Andreassen R.
    ;
    Andreotti M.
    ;
    Andrews J.E.
    ;
    Appleby R.B.
    ;
    Aquines Gutierrez O.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Auriemma G.
    ;
    Baalouch M.
    ;
    Bachmann S.
    ;
    Back J.J.
    ;
    Badalov A.
    ;
    Baesso C.
    ;
    Baldini W.
    ;
    Barlow R.J.
    ;
    Barschel C.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Batozskaya V.
    ;
    Battista V.
    ;
    Bay A.
    ;
    Beaucourt L.
    ;
    Beddow J.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Belogurov S.
    ;
    Belous K.
    ;
    Belyaev I.
    ;
    Ben-Haim E.
    ;
    Bencivenni G.
    ;
    Benson S.
    ;
    Benton J.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bettler M.O.
    ;
    Van Beuzekom M.
    ;
    Bien A.
    ;
    Bifani S.
    ;
    Bird T.
    ;
    Bizzeti A.
    ;
    Bjørnstad P.M.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blouw J.
    ;
    Blusk S.
    ;
    Bocci V.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Bondar N.
    ;
    Bonivento W.
    ;
    Bonivento W.
    ;
    Borghi S.
    ;
    Borgia A.
    ;
    Borsato M.
    ;
    Bowcock T.J.V.
    ;
    Bowen E.
    ;
    Bozzi C.
    ;
    Brambach T.
    ;
    Van Den Brand J.
    ;
    Bressieux J.
    ;
    Brett D.
    ;
    Britsch M.
    ;
    Britton T.
    ;
    Brodzicka J.
    ;
    Brook N.H.
    ;
    Brown H.
    ;
    Bursche A.
    ;
    Busetto G.
    ;
    Buytaert J.
    ;
    Cadeddu S.
    ;
    Calabrese R.
    ;
    Calvi M.
    ;
    Calvo Gomez M.
    ;
    Campana P.
    ;
    Campana P.
    ;
    Campora Perez D.
    ;
    Carbone A.
    ;
    Carboni G.
    ;
    Cardinale R.
    ;
    Cardinale R.
    ;
    Cardini A.
    ;
    Carson L.
    ;
    Carvalho Akiba K.
    The resonant substructure of Bs0→D¯0K-π+ decays is studied with the Dalitz plot analysis technique. The study is based on a data sample corresponding to an integrated luminosity of 3.0fb-1 of pp collision data recorded by LHCb. A structure at m(D¯0K-)≈2.86GeV/c2 is found to be an admixture of spin-1 and spin-3 resonances. The masses and widths of these states and of the Ds2∗(2573)- meson are measured, as are the complex amplitudes and fit fractions for all the D¯0K- and K-π+ components included in the amplitude model. In addition, the Ds2∗(2573)- resonance is confirmed to be spin 2.
  • Institution Publication
    Determination of the X(3872) meson quantum numbers
    ( 2013-05-29)
    Aaij R.
    ;
    Abellan Beteta C.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adrover C.
    ;
    Affolder A.
    ;
    Ajaltouni Z.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Ali S.
    ;
    Alkhazov G.
    ;
    Alvarez Cartelle P.
    ;
    Alves A.A.
    ;
    Alves A.A.
    ;
    Amato S.
    ;
    Amerio S.
    ;
    Amhis Y.
    ;
    Anderlini L.
    ;
    Anderson J.
    ;
    Andreassen R.
    ;
    Appleby R.B.
    ;
    Aquines Gutierrez O.
    ;
    Archilli F.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Auriemma G.
    ;
    Bachmann S.
    ;
    Back J.J.
    ;
    Baesso C.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Barlow R.J.
    ;
    Barschel C.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bauer T.
    ;
    Bay A.
    ;
    Beddow J.
    ;
    Bedeschi F.
    ;
    Bediaga I.
    ;
    Belogurov S.
    ;
    Belous K.
    ;
    Belyaev I.
    ;
    Ben-Haim E.
    ;
    Benayoun M.
    ;
    Bencivenni G.
    ;
    Benson S.
    ;
    Benton J.
    ;
    Berezhnoy A.
    ;
    Bernet R.
    ;
    Bettler M.O.
    ;
    Van Beuzekom M.
    ;
    Bien A.
    ;
    Bifani S.
    ;
    Bird T.
    ;
    Bizzeti A.
    ;
    Bjørnstad P.M.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blouw J.
    ;
    Blusk S.
    ;
    Bocci V.
    ;
    Bondar A.
    ;
    Bondar N.
    ;
    Bonivento W.
    ;
    Borghi S.
    ;
    Borgia A.
    ;
    Bowcock T.J.V.
    ;
    Bowen E.
    ;
    Bozzi C.
    ;
    Brambach T.
    ;
    Van Den Brand J.
    ;
    Bressieux J.
    ;
    Brett D.
    ;
    Britsch M.
    ;
    Britton T.
    ;
    Brook N.H.
    ;
    Brown H.
    ;
    Burducea I.
    ;
    Bursche A.
    ;
    Busetto G.
    ;
    Buytaert J.
    ;
    Cadeddu S.
    ;
    Callot O.
    ;
    Calvi M.
    ;
    Calvo Gomez M.
    ;
    Camboni A.
    ;
    Campana P.
    ;
    Campana P.
    ;
    Carbone A.
    ;
    Carboni G.
    ;
    Cardinale R.
    ;
    Cardini A.
    ;
    Carranza-Mejia H.
    ;
    Carson L.
    ;
    Carvalho Akiba K.
    ;
    Casse G.
    ;
    Cattaneo M.
    ;
    Cauet C.
    ;
    Charles M.
    The quantum numbers of the X(3872) meson are determined to be JPC=1 ++ based on angular correlations in B+→X(3872)K + decays, where X(3872)→π+π-J/ψ and J/ψ→μ+μ-. The data correspond to 1.0 fb-1 of pp collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements JPC=2- + is rejected with a confidence level equivalent to more than 8 Gaussian standard deviations using a likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X(3872) state. © 2013 CERN. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
  • Institution Publication
    Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at s =13 TeV
    ( 2024-02-23)
    Aaij R.
    ;
    Abdelmotteleb A.S.W.
    ;
    Abellan Beteta C.
    ;
    Abudinen F.
    ;
    Ackernley T.
    ;
    Adeva B.
    ;
    Adinolfi M.
    ;
    Adlarson P.
    ;
    Agapopoulou C.
    ;
    Aidala C.A.
    ;
    Ajaltouni Z.
    ;
    Akar S.
    ;
    Akiba K.
    ;
    Albicocco P.
    ;
    Albrecht J.
    ;
    Alessio F.
    ;
    Alexander M.
    ;
    Alfonso Albero A.
    ;
    Aliouche Z.
    ;
    Alvarez Cartelle P.
    ;
    Amalric R.
    ;
    Amato S.
    ;
    Amey J.L.
    ;
    Amhis Y.
    ;
    Amhis Y.
    ;
    An L.
    ;
    Anderlini L.
    ;
    Andersson M.
    ;
    Andreianov A.
    ;
    Andreola P.
    ;
    Andreotti M.
    ;
    Andreou D.
    ;
    Anelli A.A.
    ;
    Anelli A.A.
    ;
    Ao D.
    ;
    Archilli F.
    ;
    Archilli F.
    ;
    Argenton M.
    ;
    Arguedas Cuendis S.
    ;
    Artamonov A.
    ;
    Artuso M.
    ;
    Aslanides E.
    ;
    Atzeni M.
    ;
    Audurier B.
    ;
    Bacher D.
    ;
    Bachiller Perea I.
    ;
    Bachmann S.
    ;
    Bachmayer M.
    ;
    Back J.J.
    ;
    Bailly-Reyre A.
    ;
    Baladron Rodriguez P.
    ;
    Balagura V.
    ;
    Baldini W.
    ;
    Baptista De Souza Leite J.
    ;
    Barbetti M.
    ;
    Barbetti M.
    ;
    Barbosa I.R.
    ;
    Barlow R.J.
    ;
    Barsuk S.
    ;
    Barter W.
    ;
    Bartolini M.
    ;
    Baryshnikov F.
    ;
    Basels J.M.
    ;
    Bassi G.
    ;
    Bassi G.
    ;
    Batsukh B.
    ;
    Battig A.
    ;
    Bay A.
    ;
    Beck A.
    ;
    Becker M.
    ;
    Bedeschi F.
    ;
    Bediaga I.B.
    ;
    Beiter A.
    ;
    Belin S.
    ;
    Bellee V.
    ;
    Belous K.
    ;
    Belov I.
    ;
    Belyaev I.
    ;
    Benane G.
    ;
    Bencivenni G.
    ;
    Ben-Haim E.
    ;
    Berezhnoy A.
    ;
    Berkey J.L.M.
    ;
    Bernet R.
    ;
    Bernet Andres S.
    ;
    Bernstein H.C.
    ;
    Bertella C.
    ;
    Bertolin A.
    ;
    Betancourt C.
    ;
    Betti F.
    ;
    Bex J.
    ;
    Bezshyiko I.
    ;
    Bhom J.
    ;
    Bieker M.S.
    ;
    Biesuz N.V.
    ;
    Billoir P.
    ;
    Biolchini A.
    ;
    Birch M.
    ;
    Bishop F.C.R.
    ;
    Bitadze A.
    ;
    Bizzeti A.
    ;
    Blago M.P.
    ;
    Blake T.
    ;
    Blanc F.
    ;
    Blank J.E.
    The production rate of Λb0 baryons relative to B0 mesons in pp collisions at a center-of-mass energy s=13 TeV is measured by the LHCb experiment. The ratio of Λb0 to B0 production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in e+e- collisions, and increases by a factor of ∼2 with increasing multiplicity. At relatively low transverse momentum, the ratio of Λb0 to B0 cross sections is higher than what is measured in e+e- collisions, but converges with the e+e- ratio as the momentum increases. These results imply that the evolution of heavy b quarks into final-state hadrons is influenced by the density of the hadronic environment produced in the collision. Comparisons with several models and implications for the mechanisms enforcing quark confinement are discussed.