Elsevier

Physics Letters B

Volume 713, Issue 3, 9 July 2012, Pages 186-195
Physics Letters B

Measurement of the Ds+Ds production asymmetry in 7 TeV pp collisions

https://doi.org/10.1016/j.physletb.2012.06.001Get rights and content
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Abstract

Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, AP, between Ds+ and Ds mesons is studied using the ϕπ± decay mode in a data sample of 1.0fb1 collected with the LHCb detector. The difference between π+ and π 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 AP=(0.33±0.22±0.10)%. This result can constrain models of heavy flavour production.

Cited by (0)

© CERN for the benefit of the LHCb Collaboration.

p

Associated to Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.

q

Associated to Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.

a

P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia.

b

Università di Bari, Bari, Italy.

c

Università di Bologna, Bologna, Italy.

d

Università di Cagliari, Cagliari, Italy.

e

Università di Ferrara, Ferrara, Italy.

f

Università di Firenze, Firenze, Italy.

g

Università di Urbino, Urbino, Italy.

h

Università di Modena e Reggio Emilia, Modena, Italy.

i

Università di Genova, Genova, Italy.

j

Università di Milano Bicocca, Milano, Italy.

k

Università di Roma Tor Vergata, Roma, Italy.

l

Università di Roma La Sapienza, Roma, Italy.

m

Università della Basilicata, Potenza, Italy.

n

LIFAELS, La Salle, Universitat Ramon Llull, Barcelona, Spain.

o

Hanoi University of Science, Hanoi, Viet Nam.