Measurement of ψ(2S) production cross-sections in proton-proton collisions at s√=7 and 13 TeV

Abstract

The cross-sections of ψ(2S) meson production in proton-proton collisions at s√=13 TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275 pb−1. The production cross-sections for prompt ψ(2S) mesons and those for ψ(2S) mesons from b-hadron decays (ψ(2S)-from- b) are determined as functions of the transverse momentum, pT, and the rapidity, y, of the ψ(2S) meson in the kinematic range 2<pT<20 GeV/c and 2.0<y<4.5. The production cross-sections integrated over this kinematic region are σ( prompt ψ(2S),13 TeV)=1.430±0.005 (stat)±0.099 (syst)μb,σ(ψ(2S)-from- b,13 TeV)=0.426±0.002 (stat)±0.030 (syst)μb. A new measurement of ψ(2S) production cross-sections in pp collisions at s√=7 TeV is also performed using data collected in 2011, corresponding to an integrated luminosity of 614 pb−1. The integrated production cross-sections in the kinematic range 3.5<pT<14 GeV/c and 2.0<y<4.5 are σ( prompt ψ(2S),7 TeV)=0.471±0.001 (stat)±0.025 (syst)μb,σ(ψ(2S)-from- b,7 TeV)=0.126±0.001 (stat)±0.008 (syst)μb. All results show reasonable agreement with theoretical calculations.