Exclusive J/psi and psi(2S) vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be sigma(pp -> J/psi(->mu+mu-))(2.0 < eta(mu +/-) < 4.5) = 307 +/- 21 +/- 36 pb, sigma(pp ->psi(2S)(->mu+mu-))(2.0 < eta(mu +/-) < 4.5) = 7.8 +/- 1.3 +/- 1.0 pb, where the first uncertainties are statistical and the second are systematic. The measurements are found to be in good agreement with results from previous experiments and theoretical predictions. The J/psi photoproduction cross-section has been measured as a function of the photon-proton centre-of-mass energy. The results are consistent with measurements obtained at HERA and confirm a similar power law behaviour for the photoproduction cross-section.

ExclusiveJ/ψ and ψ(2S) production in pp collisions at $\protect \sqrt{s} = 7$ TeV

Abstract

Exclusive J/psi and psi(2S) vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be sigma(pp -> J/psi(->mu+mu-))(2.0 < eta(mu +/-) < 4.5) = 307 +/- 21 +/- 36 pb, sigma(pp ->psi(2S)(->mu+mu-))(2.0 < eta(mu +/-) < 4.5) = 7.8 +/- 1.3 +/- 1.0 pb, where the first uncertainties are statistical and the second are systematic. The measurements are found to be in good agreement with results from previous experiments and theoretical predictions. The J/psi photoproduction cross-section has been measured as a function of the photon-proton centre-of-mass energy. The results are consistent with measurements obtained at HERA and confirm a similar power law behaviour for the photoproduction cross-section.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2591446
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