Coherent photoproduction of ρ<SUP>0</SUP> vector mesons in ultra-peripheral Pb-Pb collisions at √sNN=5.02 TeV

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초록

Cross sections for the coherent photoproduction of rho(0) vector mesons in ultra-peripheral Pb-Pb collisions at root s(NN) = 5.02 TeV are reported. The measurements, which rely on the pi(+)pi(-) decay channel, are presented in three regions of rapidity covering the range vertical bar y vertical bar < 0.8. For each rapidity interval, cross sections are shown for different nuclear-breakup classes defined according to the presence of neutrons measured in the zero-degree calorimeters. The results are compared with predictions based on different models of nuclear shadowing. Finally, the observation of a coherently produced resonance-like structure with a mass around 1.7 GeV/c(2) and a width of about 140 MeV/c(2) is reported and compared with similar observations from other experiments.

키워드

Heavy Ion ExperimentsHeavy-ion collisionParticle and resonance productionSMALL-XSATURATIONDISSOCIATIONDEPENDENCEPHOTONMODELMASS
제목
Coherent photoproduction of ρ<SUP>0</SUP> vector mesons in ultra-peripheral Pb-Pb collisions at √sNN=5.02 TeV
저자
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DOI
10.1007/JHEP06(2020)035
발행일
2020-06-04
유형
Article
저널명
Journal of High Energy Physics
6