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

Abstract : The asymmetry in the production cross-section \sigma\ of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta\ and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0 < p_T < 18.0 GeV/c and 2.20 < \eta\ < 4.75, the production asymmetry is A_P = (-0.96+/-0.26+/-0.18)%. The uncertainties quoted are statistical and systematic, respectively. The result assumes that any direct CP violation in the D+ -> K_S pi+ decay is negligible. No significant dependence on \eta\ or p_T is observed.
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Contributor : Berger Nicole <>
Submitted on : Thursday, November 8, 2012 - 5:00:07 PM
Last modification on : Thursday, November 8, 2012 - 5:00:07 PM

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R. Aaij, I. De Bonis, D. Decamp, Ph. Ghez, P. Hopchev, et al.. Measurement of the D+/- production asymmetry in 7 TeV pp collisions. Physics Letters B, Elsevier, 2013, 718, pp.902-909. <10.1016/j.physletb.2012.11.038>. <in2p3-00749982>

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