The differential cross-section for the inclusive production of psi(2S) mesons in pp collisions at &RADIC 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 < y(psi(2S)) <= 4.5 we measure sigma(prompt)(psi(2S)) = 1.44 +/- 0.01 (stat) +/- 0.12 (syst)(-0.40)(+0.20) (pol) mu b, &SIGMA(b)(psi(2S)) = 0.25 +/- 0.01 (stat) +/- 0.02 (syst) mu b, 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))* 10(-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.

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

BALDINI, Wander;BOZZI, Concezio;FALABELLA, Antonio;SAVRIE', Mauro;
2012

Abstract

The differential cross-section for the inclusive production of psi(2S) mesons in pp collisions at &RADIC 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 < y(psi(2S)) <= 4.5 we measure sigma(prompt)(psi(2S)) = 1.44 +/- 0.01 (stat) +/- 0.12 (syst)(-0.40)(+0.20) (pol) mu b, &SIGMA(b)(psi(2S)) = 0.25 +/- 0.01 (stat) +/- 0.02 (syst) mu b, 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))* 10(-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.
2012
R., Aaij; C. A., Beteta; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; G., Alkhazov; P....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1893357
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