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dc.contributor.authorKarasu Uysal, Ayben
dc.contributor.authorALICE, Collaboration
dc.date.accessioned2019-07-05T11:18:26Z
dc.date.available2019-07-05T11:18:26Z
dc.date.issued2014
dc.identifier.urihttps://hdl.handle.net/20.500.12498/499
dc.description.abstractWe present the first measurement at the LHC of exclusive J=ψ photoproduction off protons, in pffiffiffiffiffiffiffi ultraperipheral proton-lead collisions at sNN 1⁄4 5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5 < y < 4 (p-Pb) or −3.6 < y < −2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections σðγ þ p → J=ψ þ pÞ are 33.2 2.2ðstatÞ 3.2ðsystÞ 0.7ðtheorÞ nb in p-Pb and 284 36ðstatÞþ27ðsystÞ −32 26ðtheorÞ nb in Pb-p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J=ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2 × 10−2 and ∼2 × 10−5, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.en_US
dc.relationhttp://dx.doi.org/10.1103/PhysRevLett.113.232504en_US
dc.subjectALICE, LHC, J/psi photoproductionen_US
dc.titleExclusive J=ψ Photoproduction off Protons in Ultraperipheral p-Pb Collisions pffiffiffiffiffiffiffi exclusive J=ψ photoproduction in collisions of protons at sNN 1⁄4 5.02 TeVen_US
dc.typeArticleen_US
eperson.orcidid0000-0001-6297-2532en_US


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