Cross sections for the coherent photoproduction of 0 vector mesons in ultraperipheral Pb-Pb collisions at p sNN = 5:02TeV are reported. The measurements, which rely on the pi+pi- decay channel, are presented in three regions of rapidity covering the range jyj < 0:8. For each rapidity interval, cross sections are shown for dierent nuclear breakup classes dened according to the presence of neutrons measured in the zero-degree calorimeters. The results are compared with predictions based on dierent models of nuclear shadowing. Finally, the observation of a coherently produced resonance-like structure with a mass around 1.7 GeV/c2 and a width of about 140 MeV/c2 is reported and compared with similar observations from other experiments.

Coherent photoproduction of ρ0 vector mesons in ultra-peripheral Pb-Pb collisions at $$ sqrt{{mathrm{s}}_{mathrm{NN}}} $$ = 5.02 TeV

Colella, D.;Di Bari, D.
Membro del Collaboration Group
;
Mazzilli, M.;Volpe, G.
Membro del Collaboration Group
;
2020-01-01

Abstract

Cross sections for the coherent photoproduction of 0 vector mesons in ultraperipheral Pb-Pb collisions at p sNN = 5:02TeV are reported. The measurements, which rely on the pi+pi- decay channel, are presented in three regions of rapidity covering the range jyj < 0:8. For each rapidity interval, cross sections are shown for dierent nuclear breakup classes dened according to the presence of neutrons measured in the zero-degree calorimeters. The results are compared with predictions based on dierent models of nuclear shadowing. Finally, the observation of a coherently produced resonance-like structure with a mass around 1.7 GeV/c2 and a width of about 140 MeV/c2 is reported and compared with similar observations from other experiments.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/301291
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