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Measurement of the $\Lambda_b$ cross section and the $_{\bar{\Lambda}_b}$ to $\Lambda_b$ ratio with $J/\Psi \Lambda$ decays in $pp$ collisions at $\sqrt{s}=7$ TeV

2013-07-16Artigo científico Acesso aberto
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dc.contributor.authorCMS collaboration (2191 authors)
dc.contributor.authorHollar, Jonathan
dc.contributor.authorNayak, Aruna
dc.contributor.authorAlmeida, Nuno
dc.contributor.authorBargassa, Pedrame
dc.contributor.authorDavid Tinoco Mendes, Andre
dc.contributor.authorFaccioli, Pietro
dc.contributor.authorFerreira Parracho, Pedro Guilherme
dc.contributor.authorGallinaro, Michele
dc.contributor.authorSeixas, Joao
dc.contributor.authorVarela, Joao
dc.contributor.authorVischia, Pietro
dc.contributor.authorLloret Iglesias, Lara
dc.contributor.authorMusella, Pasquale
dc.contributor.authorRodrigues Antunes, Joao
dc.contributor.authorSilva, Pedro
dc.contributor.authorPela, Joao
dc.contributor.authorLeonardo, Nuno
dc.date.accessioned2019-02-03T19:51:05Z
dc.date.available2019-02-03T19:51:05Z
dc.date.issued2013-07-16
dc.date.updated2019-02-03T19:51:05Z
dc.description.abstractThe Lambda(b) differential production cross section and the cross section ratio anti-Lambda(b)/Lambda(b) are measured as functions of transverse momentum pt(Lambda(b)) and rapidity abs(y(Lambda(b))) in pp collisions at sqrt(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 to an opposite-sign muon pair and Lambda to proton pion, using a data sample corresponding to an integrated luminosity of 1.9 inverse femtobarns. The product of the cross section times the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls faster than that of b mesons. The measured value of the cross section times the branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.06 +/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are statistical and systematic, respectively.
dc.description.versionPeer Reviewed
dc.identifierPhys.Lett. B714 (2012) 136-157; DOI 10.1016/j.physletb.2012.05.063
dc.identifier.urihttp://dx.doi.org/10.1016/j.physletb.2012.05.063
dc.identifier.urihttp://hdl.handle.net/10400.26/26169
dc.language.isoeng
dc.titleMeasurement of the $\Lambda_b$ cross section and the $_{\bar{\Lambda}_b}$ to $\Lambda_b$ ratio with $J/\Psi \Lambda$ decays in $pp$ collisions at $\sqrt{s}=7$ TeV
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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