The Î b differential production cross section and the cross section ratio Ï(Î-b)/Ï(Îb) are measured as functions of transverse momentum pTÎb and rapidity |y Îb| in pp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Î b decays reconstructed in the exclusive final state J/ÏÎ, with the subsequent decays J/Ïâμ +μ - and ÎâpÏ, using a data sample corresponding to an integrated luminosity of 1.9 fb -1. The product Ï(Îb)ÃB(ÎbâJ/ÏÎ) versus pTÎb falls faster than that of b mesons. The measured value of Ï(Îb)ÃB(ÎbâJ/ÏÎ) for pTÎb>10 GeV and |y Îb|<2.0 is 1.16±0.06±0.12nb, and the integrated Ï(Î-b)/Ï(Îb) ratio is 1.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively. © 2012 CERN.
Measurement of the Î b cross section and the Î- b to Î b ratio with J/ÏÎ decays in pp collisions at s=7 TeV
ALBERGO, Sebastiano Francesco;CAPPELLO, GIGI;CHIORBOLI, MASSIMILIANO;COSTA, Salvatore;POTENZA, Renato Carlo;TRICOMI, Alessia Rita;TUVE', Cristina Natalina;
2012-01-01
Abstract
The Î b differential production cross section and the cross section ratio Ï(Î-b)/Ï(Îb) are measured as functions of transverse momentum pTÎb and rapidity |y Îb| in pp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Î b decays reconstructed in the exclusive final state J/ÏÎ, with the subsequent decays J/Ïâμ +μ - and ÎâpÏ, using a data sample corresponding to an integrated luminosity of 1.9 fb -1. The product Ï(Îb)ÃB(ÎbâJ/ÏÎ) versus pTÎb falls faster than that of b mesons. The measured value of Ï(Îb)ÃB(ÎbâJ/ÏÎ) for pTÎb>10 GeV and |y Îb|<2.0 is 1.16±0.06±0.12nb, and the integrated Ï(Î-b)/Ï(Îb) ratio is 1.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively. © 2012 CERN.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.