# 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00749982
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Submitted on : Thursday, November 8, 2012 - 5:07:41 PM
Last modification on : Thursday, December 16, 2021 - 2:10:29 PM

### Citation

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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