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Physics Letters B 718 (2013) 902-909
Measurement of the D+/- production asymmetry in 7 TeV pp collisions
R. Aaij, I. De Bonis1, D. Decamp1, Ph. Ghez1, P. Hopchev1, J.-P. Lees1, I.V. Machikhiliyan1, M.-N. Minard1, B. Pietrzyk1, S. T'Jampens1, V. Tisserand1, E. Tournefier1, S. Barsuk2, O. Callot2, J. He2, B. Jean-Marie2, J. Lefrançois2, F. Machefert2, A. Martin Sanchez2, M. Nicol2, P. Robbe2, M.-H. Schune2, B. Viaud2, I. Videau2, E. Ben-Haim3, M. Benayoun3, P. David3, L. Del Buono3, A. Martens3, Z J Ajaltouni4, O. Deschamps4, E. Cogneras4, I. El Rifai4, P. Henrard4, M. Hoballah4, M. Jahjah Hussein4, R. Lefèvre4, L. Li Gioi4, S. Monteil4, V. Niess4, P. Perret4, D.A. Roa Romero4, K. Sobczak4, C. Adrover5, E. Aslanides5, J. Cogan5, R. Legac5, O. Leroy5, G. Mancinelli5, E. Maurice5, M. Perrin-Terrin5, M. Sapunov5, J. Serrano5, A. Tsaregorodtsev5
For the LHCb collaboration(s)
(2013)

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.
1:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2:  LAL - Laboratoire de l'Accélérateur Linéaire
3:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4:  LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand
5:  CPPM - Centre de Physique des Particules de Marseille
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1210.4112