Exclusive J/ψ and ψ(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 σpp→J/ψ(→μ+μ−)(2.0<ημ±<4.5)=307±21±36pb,σpp→ψ(2S)(→μ+μ−)(2.0<ημ±<4.5)=7.8±1.3±1.0pb, 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/ψ 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.

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

AURIEMMA, Giulio;SATRIANO, Celestina;
2013-01-01

Abstract

Exclusive J/ψ and ψ(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 σpp→J/ψ(→μ+μ−)(2.0<ημ±<4.5)=307±21±36pb,σpp→ψ(2S)(→μ+μ−)(2.0<ημ±<4.5)=7.8±1.3±1.0pb, 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/ψ 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.
2013
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/59441
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