The differential cross-section for the inclusive production of Psi(2S) mesons in pp collisions at sqrt(s)=7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb-1. The Psi(2S) mesons are reconstructed in the decay channels Psi(2S)-&gt;mu+mu- and Psi(2S)-&gt;J/Psi pi+ pi-, with the J/Psi meson decaying into two muons. Results are presented both for promptly produced Psi(2S) mesons and for those originating from b-hadron decays. In the kinematic range pT(Psi(2S))&lt;=16 GeV/c and 2&lt;=4.5 we measure sigma_prompt(Psi(2S))=1.44+-0.01(stat)+-0.12(syst)+0.20-0.40(pol) ub, where the last uncertainty on the prompt cross-section is due to the unknown Psi(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J /Psi measurements we determine the inclusive branching fraction B(b-&gt;Psi(2S)X)=(2.73+-0.06(stat)+-0.16(syst)+-0.24(BF))x10^-3, where the last uncertainty is due to the B(b-&gt;J/Psi X), B(J/Psi-&gt;mu+mu-) and B(Psi(2S)-&gt;e+e-) branching fraction uncertainties. measurements we determine the inclusive branching frac- tion B b → ψ(2S)X = 2.73 ± 0.06 (stat) ± 0.16 (syst) ± 0.24 (BF) × 10

### Measurement of Psi(2S) meson production in pp collisions at sqrt{s}=7 TeV

#### Abstract

The differential cross-section for the inclusive production of Psi(2S) mesons in pp collisions at sqrt(s)=7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb-1. The Psi(2S) mesons are reconstructed in the decay channels Psi(2S)->mu+mu- and Psi(2S)->J/Psi pi+ pi-, with the J/Psi meson decaying into two muons. Results are presented both for promptly produced Psi(2S) mesons and for those originating from b-hadron decays. In the kinematic range pT(Psi(2S))<=16 GeV/c and 2<=4.5 we measure sigma_prompt(Psi(2S))=1.44+-0.01(stat)+-0.12(syst)+0.20-0.40(pol) ub, where the last uncertainty on the prompt cross-section is due to the unknown Psi(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J /Psi measurements we determine the inclusive branching fraction B(b->Psi(2S)X)=(2.73+-0.06(stat)+-0.16(syst)+-0.24(BF))x10^-3, where the last uncertainty is due to the B(b->J/Psi X), B(J/Psi->mu+mu-) and B(Psi(2S)->e+e-) branching fraction uncertainties. measurements we determine the inclusive branching frac- tion B b → ψ(2S)X = 2.73 ± 0.06 (stat) ± 0.16 (syst) ± 0.24 (BF) × 10
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/11380/812729`