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

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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 1.0fb -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 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. © 2012 CERN.

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Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., … Zvyagin, A. (2012). Measurement of the D s+-D s- production asymmetry in 7 TeV pp collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 713(3), 186–195. https://doi.org/10.1016/j.physletb.2012.06.001

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