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Report number arXiv:1706.07013 ; LHCB-PAPER-2017-007 ; CERN-EP-2017-099 ; LHCB-PAPER-2017-007
Title Study of charmonium production in b-hadron decays and first evidence for the decay Bs0ϕϕϕ
Related titleStudy of charmonium production in b-hadron decays and first evidence for the decay Bsϕϕϕ
Author(s) LHCb Collaboration  Εμφάνιση και των 773 συγγραφέων
Publication Springer, 2017-09-14
Imprint 2017-06-21
Number of pages 32
Note All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-007.html . This version differs by minor editorial modifications corresponding to the EPJC publication. No changes in the content of the paper
In: Eur. Phys. J. C 77 (2017) 609
DOI 10.1140/epjc/s10052-017-5151-8
Subject category hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords QCD ; quarkonium ; spectroscopy ; branching fraction ; particle and resonance production ; experimental results
Abstract Using decays to ϕ-meson pairs, the inclusive production of charmonium states in b-hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0fb1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by BCB(bCX)×B(Cϕϕ) the inclusive branching fraction of a b hadron to a charmonium state C that decays into a pair of ϕ mesons, ratios RC2C1BC1/BC2 are determined as Rηc(1S)χc0=0.147±0.023±0.011, Rηc(1S)χc1=0.073±0.016±0.006, Rηc(1S)χc2=0.081±0.013±0.005, Rχc0χc1=0.50±0.11±0.01, Rχc0χc2=0.56±0.10±0.01 and Rηc(1S)ηc(2S)=0.040±0.011±0.004. Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and χc2(2P) states are obtained as Rχc1X(3872)<0.34, Rχc0X(3915)<0.12 and Rχc2χc2(2P)<0.16. Differential cross-sections as a function of transverse momentum are measured for the ηc(1S) and χc states. The branching fraction of the decay Bs0ϕϕϕ is measured for the first time, B(Bs0ϕϕϕ)=(2.15±0.54±0.28±0.21B)×106. Here the third uncertainty is due to the branching fraction of the decay Bs0ϕϕ, which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse ϕ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the ηc(1S) decays to ϕϕ and pp¯ as B(ηc(1S)ϕϕ)/B(ηc(1S)pp¯)=1.79±0.14±0.32.
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Preprint: © 2017-2024 CERN (License: CC-BY-4.0)



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 Δημιουργία εγγραφής 2017-06-24, τελευταία τροποποίηση 2024-08-17


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