Measurement of the D-s+-D-s- production asymmetry in 7 TeV pp collisions

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Back, J. J. ; Craik, Daniel ; Dossett, D. ; Gershon, T. J. ; Harrison, P. F. ; Kreps, Michal ; Latham, Thomas ; Pilar, T. ; Poluektov, Anton ; Reid, Matthew M. ; Silva Coutinho, R. ; Whitehead, M. (Mark) ; Williams, M. P. ; HASH(0x561a12a60590) (2012)
  • Publisher: Elsevier Science BV
  • Related identifiers: doi: 10.1016/j.physletb.2012.06.001
  • Subject: QC
    arxiv: High Energy Physics::Phenomenology | High Energy Physics::Experiment

Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, AP, between and mesons is studied using the ϕπ± decay mode in a data sample of 1.0 fb−1 collected with the LHCb detector. The difference between π+ and π− detection efficiencies is determined using the ratios of fully reconstructed to partially reconstructed D⁎± decays. The overall production asymmetry in the rapidity region 2.0 to 4.5 with transverse momentum larger than 2 GeV is measured to be AP=(−0.33±0.22±0.10)%. This result can constrain models of heavy flavour production.
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