Measurement of ψ(2S) meson production in pp collisions at s√=7 TeV

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

Research output: Contribution to journalArticlepeer-review

Abstract

The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at s√=7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb−1. The ψ(2S) mesons are reconstructed in the decay channels ψ(2S)→μ + μ − and ψ(2S)→J/ψπ + π −, with the J/ψ meson decaying into two muons. Results are presented both for promptly produced ψ(2S) mesons and for those originating from b-hadron decays. In the kinematic range p T(ψ(2S))≤16 GeV/c and 2<y(ψ(2S))≤4.5 we measure where the last uncertainty on the prompt cross-section is due to the unknown ψ(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/ψ measurements we determine the inclusive branching fraction where the last uncertainty is due to the B(b→J/ψX) , B(J/ψ→μ+μ−) and B(ψ(2S)→e+e−) branching fraction uncertainties.
Original languageEnglish
Pages (from-to)2100
Number of pages1
JournalEuropean Physical Journal C
VolumeC72
Early online date5 Apr 2012
DOIs
Publication statusPublished - Aug 2012

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