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

# metadata.dc.description.abstract[].value
The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at  s√=7 TeVs=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
https://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equa_HTML.gif
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
https://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equb_HTML.gif
where the last uncertainty is due to the  (b→J/ψX)B(b→J/ψX) ,  (J/ψ→μ+μ−)B(J/ψ→μ+μ−)  and  (ψ(2S)→e+e−)B(ψ(2S)→e+e−)  branching fraction uncertainties.

# metadata.dc.publisher[].value
Società Italiana di Fisica & Springer Verlag

# metadata.dc.relation.ispartof[].value
European Physical Journal C, 2012, vol. 72, p. 2100

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Measurement of ψ(2S) meson production in pp collisions at √s=7 TeV