Study of the production of Λb0 and B0 hadrons in pp collisions and first measurement of the Λb0→J/ψpK- branching fraction

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R. Aaij and   et al  (LHCb Collaboration). Study of the production of Λb0 and B0 hadrons in pp collisions and first measurement of the Λb0→J/ψpK- branching fraction[J]. Chinese Physics C, 2016, 40(1): 011001. doi: 10.1088/1674-1137/40/1/011001
R. Aaij and   et al  (LHCb Collaboration). Study of the production of Λb0 and B0 hadrons in pp collisions and first measurement of the Λb0→J/ψpK- branching fraction[J]. Chinese Physics C, 2016, 40(1): 011001.  doi: 10.1088/1674-1137/40/1/011001 shu
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Received: 2015-09-01
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    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)

    MNiSW and NCN (Poland)

    MEN/IFA (Romania)

    MinES and FANO (Russia)

    MinECo (Spain)

    SNSF and SER (Switzerland)

    NASU (Ukraine)

    STFC (United Kingdom)

    NSF (USA). The Tier1 computing centres are supported by IN2P3 (France), KIT and BMBF (Germany), INFN (Italy), NWO and SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom). Individual groups or members have received support from EPLANET, Marie Sklodowska-Curie Actions and ERC (European Union), Conseil generalde Haute-Savoie, Labex ENIGMASS and OCEVU, Region Auvergne (France), RFBR (Russia), XuntaGal and GENCAT (Spain), Royal Society and Royal Commission for the Exhibition of 1851 (United Kingdom).

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Study of the production of Λb0 and B0 hadrons in pp collisions and first measurement of the Λb0→J/ψpK- branching fraction

Fund Project:  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) MNiSW and NCN (Poland) MEN/IFA (Romania) MinES and FANO (Russia) MinECo (Spain) SNSF and SER (Switzerland) NASU (Ukraine) STFC (United Kingdom) NSF (USA). The Tier1 computing centres are supported by IN2P3 (France), KIT and BMBF (Germany), INFN (Italy), NWO and SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom). Individual groups or members have received support from EPLANET, Marie Sklodowska-Curie Actions and ERC (European Union), Conseil generalde Haute-Savoie, Labex ENIGMASS and OCEVU, Region Auvergne (France), RFBR (Russia), XuntaGal and GENCAT (Spain), Royal Society and Royal Commission for the Exhibition of 1851 (United Kingdom).

Abstract: The product of the Λb0(B0) di erential production cross-section and the branching fraction of the decay Λb0→J/ψpK- (B0→J/ψpK*(892)0) is measured as a function of the beauty hadron transverse momentum, pT, and rapidity, y. The kinematic region of the measurements is pT <20 GeV/c and 2.0< y< 4.5. 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= 7 TeV in 2011 and √s= 8 TeV in 2012. Based on previous LHCb results of the fragmentation fraction ratio, fΛb0/fd, the branching fraction of the decay Λb0→J/ψpK- is measured to be
Bb0→J/ψpK-)=(3.17±0.04±0.07±0.34-0.28+0.45)×10-4,
where the rst uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay B0→J/ψpK*(892)0, and the fourth is due to the knowledge of fΛb0/fd. The sum of the asymmetries in the production and decay between Λb0 and Λb0 is also measured as a function of pT and y. The previously published branching fraction of Λb0→J/ψpπ-, relative to that of Λb0→J/ψpK-, is updated. The branching fractions of Λb0→Pc+(→J/ψp)K- are determined.

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