Measurement of the Lambda(b) cross section and the (Lambda)over-bar(b) to Lambda(b) ratio with J/psi Lambda decays in pp collisions at root s=7 TeV CMS Collaboration
CMS Collaboration (ukupan broj autora: 2192)
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The Lambda b differential production cross section and the cross section ratio sigma((Lambda) over bar (b))/sigma(Lambda(b)) are measured as functions of transverse momentum p(T)(Lambda b) rapidity vertical bar y(Lambda b)vertical bar in pp collisions at root s = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Lambda(b) decays reconstructed in the exclusive final state J/psi Lambda, with the subsequent decays J/psi - GT mu(+)mu(-) and Lambda - GT p pi, using a data sample corresponding to an integrated luminosity of 1.9 fb(-1). The product sigma(Lambda(b)) x B(Lambda(b) - GT J/psi Lambda) versus p(T)(Lambda b) falls faster than that of b mesons. The measured value of sigma(Lambda(b)) x B(Lambda(b) - GT J/psi Lambda) for p(T)(Lambda b) GT 10 GeV and vertical bar y(Lambda b)vertical bar LT 2.0 is 1.16 +/- 0.06 +/- 0.12 nb, and the integrated sigma( LT (Lambda)over bar GT (b))/sigma(Lambda(b)) ratio is 1.02 +/- 0.07 +/- 0.09, where the uncertaint...ies are statistical and systematic, respectively. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
Keywords:CMS / B physics
Source:Physics Letters B, 2012, 714, 2-5, 136-157
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