Coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at sNN=2.76 TeV

Nuclear and High Energy Physics Electroproduction FOS: Physical sciences [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] 530 01 natural sciences High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Nuclear Physics - Experiment Nuclear Experiment (nucl-ex) Nuclear Experiment Hera ta114 PHYSICS; HERA; ELECTROPRODUCTION; LHC; QCD J/ψ photoproduction Physics ddc:530 ALICE experiment; Ultra-peripheral Pb-Pb collisions; J/psi photoproduction Qcd ddc: High Energy Physics - Phenomenology QC Physics / fizika [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] Lhc Particle Physics - Experiment j/Psi production, ultra-peripheral Pb-Pb collisions
DOI: 10.1016/j.physletb.2012.11.059 Publication Date: 2012-12-06T00:33:08Z
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ABSTRACT
The ALICE Collaboration has made the first measurement at LHC of J/ψ photoproduction in ultra-peripheral Pb–Pb collisions sNN=2.76TeV. is identified via its dimuon decay forward rapidity region with muon spectrometer for events where hadronic activity required to be minimal. analysis based on an event sample corresponding integrated luminosity about 55 μb−1. cross section coherent production interval −3.6<y<−2.6 measured dσJ/ψcoh/dy=1.00±0.18(stat)−0.26+0.24(syst)mb. result compared theoretical models and found good agreement those which include nuclear gluon shadowing.
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