Measurement of the $D_s^+ - D_s^-$ production asymmetry in 7 TeV $pp$ collisions - INSPIRE

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Measurement of the $D_s^+ - D_s^-$ production asymmetry in 7 TeV $pp$ collisions

LHCb

Collaboration

May, 2012

10 pages

Published in:

Phys.Lett.B 713 (2012) 186-195

Published: Jul 16, 2013

e-Print:

1205.0897 [hep-ex]

DOI:

10.1016/j.physletb.2012.06.001

Report number:

CERN-PH-EP-2012-114,
LHCB-PAPER-2012-009

Experiments:

CERN-LHC-LHCb

View in:

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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, 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.

production: asymmetry
heavy quark: production
p p: scattering
D/s-: direct production
D/s+: direct production
transverse momentum: dependence
CERN LHC Coll
particle identification: (pi+ pi-)
efficiency
rapidity dependence

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