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

Abstract

Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is studied using the ϕπ(+/-) decay mode in a data sample of 1.0/fb 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 Ds rapidity region 2.0 to 4.5 with transverse momentum larger than 2 GeV is measured to be A_P=(-0.33 +/- 0.22 +/- 0.10)%. This result can constrain models of heavy flavour production.

arXiv comment13 pages, 10 figures, updated to published version

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