Measurement of the D± production asymmetry in 7 TeV pp collisions

Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE Nuclear and High Energy Physics [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] Particles & Fields 53 - Física FOS: Physical sciences Astronomy & Astrophysics 7. Clean energy 01 natural sciences Physics, Particles & Fields High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Gran col·lisionador d'hadrons (França i Suïssa) Nuclear SDG 7 - Affordable and Clean Energy Física--Mesuraments QC Science & Technology PHYSICS, MULTIDISCIPLINARY 53 Physics Physics, Nuclear Col·lisions (Física nuclear) Physical Sciences DECAY MULTIDISCIPLINARY
DOI: 10.1016/j.physletb.2012.11.038 Publication Date: 2012-11-19T09:30:35Z
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ABSTRACT
The asymmetry in the production cross-section ��of D+/- mesons, A_P = (��(D+) - ��(D-))/(��(D+) + ��(D-)), is measured in bins of pseudorapidity ��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 < ��< 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 ��or p_T is observed.<br/>12 pages, 5 figures<br/>
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