Measurement of the D+s − D−s production asymmetry in 7 TeV pp collisions

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Title:	Measurement of the D+s − D−s production asymmetry in 7 TeV pp collisions
Author:	Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN
Other authors:	Universitat Ramon Llull. La Salle; CERN
Abstract:	Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is studied using the \phi\pi(+/-) decay mode in a data sample of 1.0/fb collected with the LHCb detector. The difference between \pi+ and \pi- detection efficiencies is determined using the ratios of fully reconstructed to partially reconstructed D*(+/-) decays. The overall production asymmetry in the Ds rapidity region 2.0 to 4.5 with transverse momentum larger than 2 GeV is measured to be A_P=(-0.33 +/- 0.22 +/- 0.10)%. This result can constrain models of heavy flavour production.
Publication date:	2012-07-09
Subject (UDC):	53 - Física
Subject(s):	Gran col·lisionador d'hadrons (França i Suïssa) Física--Mesuraments
Rights:	L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by-nc-nd/4.0/ © CERN
Pages:	13 p.
Document type:	Article Article - Published version
DOI:	http://dx.doi.org/10.1016/j.physletb.2012.06.001
Published by:	Elsevier
Publish at:	Physics Letters B, 2012, Vol. 713, No. 3, (Juliol)
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