Exclusive J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions at √sNN=5.02 TeV
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Exclusive J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions at √sNN=5.02 TeV. / Abelev, B.; Adam, J.; Adamová, D.; Aggarwal, M.M.; Bearden, Ian; Bøggild, Hans; Christensen, Christian Holm; Gulbrandsen, Kristjan Herlache; Gaardhøje, Jens Jørgen; Nielsen, Børge Svane; Hansen, Alexander Colliander; Bilandzic, Ante; Chojnacki, Marek; Zaccolo, Valentina.
In: Physical Review Letters, Vol. 113, 232504, 30.06.2014.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Exclusive J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions at √sNN=5.02 TeV
AU - Abelev, B.
AU - Adam, J.
AU - Adamová, D.
AU - Aggarwal, M.M.
AU - Bearden, Ian
AU - Bøggild, Hans
AU - Christensen, Christian Holm
AU - Gulbrandsen, Kristjan Herlache
AU - Gaardhøje, Jens Jørgen
AU - Nielsen, Børge Svane
AU - Hansen, Alexander Colliander
AU - Bilandzic, Ante
AU - Chojnacki, Marek
AU - Zaccolo, Valentina
PY - 2014/6/30
Y1 - 2014/6/30
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.113.232504
DO - 10.1103/PhysRevLett.113.232504
M3 - Journal article
C2 - 25526123
VL - 113
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
M1 - 232504
ER -
ID: 128726294