Exclusive J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions at √sNN=5.02 TeV
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We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at sNN−−−√=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 σ(γ+p→J/ψ+p) are 33.2±2.2(stat)±3.2(syst)±0.7(theor) nb in p−Pb and 284±36(stat)+27−32(syst)±26(theor) 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.
Original language | English |
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Article number | 232504 |
Journal | Physical Review Letters |
Volume | 113 |
ISSN | 0031-9007 |
DOIs | |
Publication status | Published - 30 Jun 2014 |
ID: 128726294