The ΛbΛb differential production cross section and the cross section ratio σ(Λ¯b)/σ(Λb) are measured as functions of transverse momentum pTΛb and rapidity |yΛb||yΛb| in pppp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on ΛbΛb decays reconstructed in the exclusive final state J/ψΛJ/ψΛ, with the subsequent decays J/ψ→μ+μ−J/ψ→μ+μ− and Λ→pπΛ→pπ, using a data sample corresponding to an integrated luminosity of 1.9 fb−11.9 fb−1. The product σ(Λb)×B(Λb→J/ψΛ)σ(Λb)×B(Λb→J/ψΛ) versus pTΛb falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ)σ(Λb)×B(Λb→J/ψΛ) for pTΛb>10 GeV and |yΛb|<2.0|yΛb|<2.0 is 1.16±0.06±0.12 nb1.16±0.06±0.12 nb, and the integrated σ(Λ¯b)/σ(Λb) ratio is 1.02±0.07±0.091.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively.

S. CHATRCHYAN, V. KHACHATRYAN, A.M. SIRUNYAN, A. TUMASYAN, W. ADAM, T. BERGAUER, et al. (2012). Measurement of the Lambda_b cross section and the antiLambda_b to Lambda_b ratio with J/psi Lambda decays in pp collisions at sqrt(s) = 7 TeV. PHYSICS LETTERS. SECTION B, 714, 136-157 [10.1016/j.physletb.2012.05.063].

Measurement of the Lambda_b cross section and the antiLambda_b to Lambda_b ratio with J/psi Lambda decays in pp collisions at sqrt(s) = 7 TeV

BONACORSI, DANIELE;BRAIBANT, SYLVIE;CAPILUPPI, PAOLO;CASTRO, ANDREA;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;MENEGHELLI, MARCO;NAVARRIA, FRANCESCO LUIGI;PRIMAVERA, FEDERICA;ROSSI, ANTONIO MARIA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;GUIDUCCI, LUIGI;BRIGLIADORI, LUCA
2012

Abstract

The ΛbΛb differential production cross section and the cross section ratio σ(Λ¯b)/σ(Λb) are measured as functions of transverse momentum pTΛb and rapidity |yΛb||yΛb| in pppp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on ΛbΛb decays reconstructed in the exclusive final state J/ψΛJ/ψΛ, with the subsequent decays J/ψ→μ+μ−J/ψ→μ+μ− and Λ→pπΛ→pπ, using a data sample corresponding to an integrated luminosity of 1.9 fb−11.9 fb−1. The product σ(Λb)×B(Λb→J/ψΛ)σ(Λb)×B(Λb→J/ψΛ) versus pTΛb falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ)σ(Λb)×B(Λb→J/ψΛ) for pTΛb>10 GeV and |yΛb|<2.0|yΛb|<2.0 is 1.16±0.06±0.12 nb1.16±0.06±0.12 nb, and the integrated σ(Λ¯b)/σ(Λb) ratio is 1.02±0.07±0.091.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively.
2012
S. CHATRCHYAN, V. KHACHATRYAN, A.M. SIRUNYAN, A. TUMASYAN, W. ADAM, T. BERGAUER, et al. (2012). Measurement of the Lambda_b cross section and the antiLambda_b to Lambda_b ratio with J/psi Lambda decays in pp collisions at sqrt(s) = 7 TeV. PHYSICS LETTERS. SECTION B, 714, 136-157 [10.1016/j.physletb.2012.05.063].
S. CHATRCHYAN; V. KHACHATRYAN; A.M. SIRUNYAN; A. TUMASYAN; W. ADAM; T. BERGAUER; M. DRAGICEVIC; J. ER .A N(O; C. FABJAN; M. FRIEDL; R. FRUHWIRTH; V.M....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/127753
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