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

Measurement of the Λb cross section and the to Λb ratio with J/ψΛ decays in pp collisions at √s=7 TeV / S. Chatrchyan, V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan, M. Friedl, R. Frühwirth, V.M. Ghete, J. Hammer, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, D. Liko, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 714:(2012), pp. 136-157. [10.1016/j.physletb.2012.05.063]

Measurement of the Λb cross section and the to Λb ratio with J/ψΛ decays in pp collisions at √s=7 TeV

CIULLI, VITALIANO;D'ALESSANDRO, RAFFAELLO;FOCARDI, ETTORE;GONZI, SANDRO;P. Lenzi;
2012

Abstract

The Λb differential production cross section and the cross section ratio are measured as functions of transverse momentum and rapidity |yΛb| in pp collisions at using data collected by the CMS experiment at the LHC. The measurements are based on Λb decays reconstructed in the exclusive final state J/ψΛ, with the subsequent decays J/ψ→μ+μ− and Λ→pπ, using a data sample corresponding to an integrated luminosity of 1.9 fb−1. The product σ(Λb)×B(Λb→J/ψΛ) versus falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ) for and |yΛb|<2.0 is 1.16±0.06±0.12 nb, and the integrated ratio is 1.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively.
2012
714
136
157
S. Chatrchyan;V. Khachatryan;A.M. Sirunyan;A. Tumasyan;W. Adam;T. Bergauer;M. Dragicevic;J. Erö;C. Fabjan;M. Friedl;R. Frühwirth;V.M. Ghet...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/779527
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