The differential cross-section as a function of rapidity has been measured for the exclusive production of J/ψ ; ψ(2S) mesons in proton-proton collisions at TeV, using data collected by the LHCb experiment, corresponding to an integrated luminosity of 930 pb-1. The cross-sections times branching fractions to two muons having pseudorapidities between 2.0 ; 4.5 are measured to be σpp→J/ψ→μ+ μ? (2.0 < ημ± < 4.5) = 291 ± 7 ± 19 pb, σpp→ψ(2S)→μ+ μ? (2.0 < ημ± < 4.5) = 6.5 ± 0.9 ± 0.4 pb, where the first uncertainty is statistical ; the second is systematic. The measurements agree with next-to-leading order QCD predictions as well as with models that include saturation effects. © 2014 IOP Publishing Ltd.
Updated measurements of exclusive J/ψ ; ψ(2S) production cross-sections in pp collisions at √s = 7 TeV
PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2014-01-01
Abstract
The differential cross-section as a function of rapidity has been measured for the exclusive production of J/ψ ; ψ(2S) mesons in proton-proton collisions at TeV, using data collected by the LHCb experiment, corresponding to an integrated luminosity of 930 pb-1. The cross-sections times branching fractions to two muons having pseudorapidities between 2.0 ; 4.5 are measured to be σpp→J/ψ→μ+ μ? (2.0 < ημ± < 4.5) = 291 ± 7 ± 19 pb, σpp→ψ(2S)→μ+ μ? (2.0 < ημ± < 4.5) = 6.5 ± 0.9 ± 0.4 pb, where the first uncertainty is statistical ; the second is systematic. The measurements agree with next-to-leading order QCD predictions as well as with models that include saturation effects. © 2014 IOP Publishing Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.