Exclusive J/ψ ; 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 ; 4.5 are measured to be σpp→J/ψ(→μ+ μ -)(2.0 < ημ± < 4.5) = 307 ±21 ±36 pb σpp→ψ (2S)( →μ+ μ -))(2.0 < ημ± < 4.5) = 7.8 ±1.3 ±1.0 pb where the first uncertainties are statistical ; the second are systematic. The measurements are found to be in good agreement with results from previous experiments ; 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 ; confirm a similar power law behaviour for the photoproduction cross-section. © CERN 2013 On behalf of the LHCb Collaboration.

Exclusive J/ψ and ψ(2S) production in pp collisions at √s = 7 TeV

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2013-01-01

Abstract

Exclusive J/ψ ; 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 ; 4.5 are measured to be σpp→J/ψ(→μ+ μ -)(2.0 < ημ± < 4.5) = 307 ±21 ±36 pb σpp→ψ (2S)( →μ+ μ -))(2.0 < ημ± < 4.5) = 7.8 ±1.3 ±1.0 pb where the first uncertainties are statistical ; the second are systematic. The measurements are found to be in good agreement with results from previous experiments ; 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 ; confirm a similar power law behaviour for the photoproduction cross-section. © CERN 2013 On behalf of the LHCb Collaboration.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/179683
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