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《中国物理C》 2016-01
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Study of the production of Λ_b~0 band ~0 hadrons in pp collisions and first measurement of the Λ_b~0→J/ψpK~- branching fraction

R.Aaij;B.AdevaUniversidad de Santiago de Compostela;M.Adinolfi;A.Affolder;Z.Ajaltouni;S.Akar;J.Albrecht;F.Alessio;M.Alexander;S.Ali;G.Alkhazov;P.Alvarez Cartelle;A.A.Alves Jr;S.Amato;S.Amerio;Y.Amhis;L.An;L.Anderlini;J.Anderson;G.Andreassi;M.Andreotti;J.E.Andrews;R.B.Appleby;O.Aquines Gutierrez;F.Archilli;P.d'Argent;A.Artamonov;M.Artuso;E.Aslanides;G.Auriemma;M.Baalouch;S.Bachmann;J.J.Back;A.Badalov;C.Baesso;W.Baldini;R.J.Barlow;C.Barschel;S.Barsuk;W.Barter;V.Batozskaya;V.Battista;A.Bay;L.Beaucourt;J.Beddow;F.Bedeschi;I.Bediaga;L.J.Bel;V.Bellee;N.Belloli;I.Belyaev;E.Ben-Haim;G.Bencivenni;S.Benson;J.Benton;A.Berezhnoy;R.Bernet;A.Bertolin;M.-O.Bettler;M.van Beuzekom;A.Bien;S.Bifani;P.Billoir;T.Bird;A.Birnkraut;A.Bizzeti;T.Blake;F.Blanc;J.Blouw;S.Blusk;V.Bocci;A.Bondar;N.Bondar;W.Bonivento;S.Borghi;M.Borsato;T.J.V.Bowcock;E.Bowen;C.Bozzi;S.Braun;M.Britsch;T.Britton;J.Brodzicka;N.H.Brook;E.Buchanan;A.Bursche;J.Buytaert;S.Cadeddu;R.Calabrese;M.Calvi;M.Calvo Gomez;P.Campana;D.Campora 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The product of the A_b~0(B~0) differential production cross-section and the branching fraction of the decay A_b~0→J/ψpK~-(B~0→J/ψK~*(892)~0) is measured as a function of the beauty hadron transverse momentum,p_T,and rapidity,y.The kinematic region of the measurements is p_T 20 GeV/c and 2.0y4.5.The measurements use a data sample corresponding to an integrated luminosity of 3fb~(-1) collected by the LHCb detector in pp collisions at centre-of-mass energies s~(1/2)=7 TeV in 2011 and s~(1/2)= 8TeV in 2012.Based on previous LHCb results of the fragmentation fraction ratio,f_∧_b~0/f_d,the branching fraction of the decay ∧_b~0→J/ψpK~- is measured to be B(∧_b~0→J/ψpK~-)=(3.17±0.04±0.07±0.34_(-0.28)~(+0.45)×10~(-4)where the first uncertainty is statistical,the second is systematic,the third is due to the uncertainty on the branching fraction of the decay B~0→J/ψK~*(892)~0,and the fourth is due to the knowledge of f_∧_b~0/f_d.The sum of the asymmetries in the production and decay between A_b and A_b~0 is also measured as a function of p_T and y.The previously published branching fraction of A_b~0→J/φpπ~-,relative to that of A_b~0→J/ψpK~-,is updated.The branching fractions of∧_b~0→P_c~+(→J/ψp)K~- are determined.
【Fund】: Supported by CERN and national agencies: CAPES CNPq FAPERJ and FINEP (Brazil);; NSFC (China);; CNRS/IN2P3 (France);; BMBF DFG HGF and MPG (Germany);; INFN (Italy);; FOM and NWO (The Netherlands);; MNi SW and NCN (Poland);; MEN/IFA(Romania);; Min ES and FANO (Russia);; Min ECo (Spain);; SNSF and SER (Switzerland);; NASU (Ukraine);; STFC (United Kingdom);; NSF (USA);; supported by IN2P3 (France) KIT and BMBF (Germany) INFN (Italy) NWO;; SURF(The Netherlands) PIC (Spain) Grid PP (United Kingdom);; support from EPLANET Marie Sk lodowska-Curie Actions;; ERC (European Union) Conseil général de Haute-Savoie Labex ENIGMASS and OCEVU Région;; Auvergne (France) RFBR (Russia) Xunta Gal;; GENCAT (Spain) Royal Society and Royal Commission for the Exhibition of 1851(United Kingdom)
【CateGory Index】: O572.243
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