Prompt Jpsi and b->Jpsi X production in pp collisions

Abstract

International audienceThe LHCb measurement of the J/ψ production cross-section is presented. The double differential cross-section is measured as a function of the J/ψ transverse momentum pT and of the J/ψ rapidity y in the fiducial region pT∈[0;14],GeV/c and y∈[2.0;4.5]. The analysis is based on a sample of 5.2 pb−1 collected in September 2010 at the pp Large Hadron Collider at CERN, at a centre-of-mass energy of s = 7TeV. The contributions from prompt J/ψ and J/ψ from b are separated using the J/ψ pseudo-proper time