Measurement of ψ ( 2 S ) production cross-sections in proton-proton collisions at s = 7 and 13 TeV
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Abstract: The cross-sections of ψ(2S) meson production in proton-proton collisions at s=13TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275pb-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<20GeV/c and 2.0<y<4.5. The production cross-sections integrated over this kinematic region are σ(promptψ(2S), 13TeV)=1.430±0.005(stat)±0.099(syst)μb, σ(ψ(2S)-from-b, 13TeV)=0.426±0.002(stat)±0.030(syst)μb.A new measurement of ψ(2S) production cross-sections in pp collisions at s=7TeV is also performed using data collected in 2011, corresponding to an integrated luminosity of 614pb-1. The integrated production cross-sections in the kinematic range 3.5<pT<14GeV/c and 2.0<y<4.5 are σ(promptψ(2S), 7TeV)=0.471±0.001(stat)±0.025(syst)μb, σ(ψ(2S)-from-b, 7TeV)=0.126±0.001(stat)±0.008(syst)μb.All results show reasonable agreement with theoretical calculations.
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1434-6052