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Energy dependence of exclusive J/ψ photoproduction off protons in ultra-peripheral p–Pb collisions at sNN=5.02 TeV
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- Acosta, FT;
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Published Web Location
https://doi.org/10.1140/epjc/s10052-019-6816-2No data is associated with this publication.
Abstract
The ALICE Collaboration has measured the energy dependence of exclusive photoproduction of J / ψ vector mesons off proton targets in ultra–peripheral p–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02 TeV. The e + e - and μ + μ - decay channels are used to measure the cross section as a function of the rapidity of the J / ψ in the range - 2.5 < y< 2.7 , corresponding to an energy in the γp centre-of-mass in the interval 40 < W γp < 550 GeV. The measurements, which are consistent with a power law dependence of the exclusive J / ψ photoproduction cross section, are compared to previous results from HERA and the LHC and to several theoretical models. They are found to be compatible with previous measurements.