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Measurement of the D± production asymmetry in 7 TeV pp collisions
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LHCb Collaboration (Including: 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) and Williams, M. P.). (2013) Measurement of the D± production asymmetry in 7 TeV pp collisions. Physics Letters B, Volume 718 (Number 3). pp. 902-909. doi:10.1016/j.physletb.2012.11.038 ISSN 0370-2693.
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Official URL: http://dx.doi.org/10.1016/j.physletb.2012.11.038
Abstract
The asymmetry in the production cross-section sigma of D± mesons, Ap = σ(D+)- σ(D-)/ σ(D+)+ σ(D-), is measured in bins of pseudorapidity η and transverse momentum pT within the acceptance of the LHCb detector. The result is obtained with a sample of D+ → K-s(0)π(+) 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 < η < 4.75, the production asymmetry is Ap = (-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(0)π(+) decay is negligible. No significant dependence on η or p(T) is observed.
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