Coherent ρ0 photoproduction in ultra-peripheral Pb–Pb collisions at √sNN = 2.76 TeV

Adam, J. and Adamová, D. and Aggarwal, M. M. and Aglieri, Rinella G. and Agnello, M. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Oláh, László and Pochybova, Sona (2015) Coherent ρ0 photoproduction in ultra-peripheral Pb–Pb collisions at √sNN = 2.76 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015 (9). ISSN 1126-6708

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Abstract

We report the first measurement at the LHC of coherent photoproduction of ρ0 mesons in ultra- peripheral Pb–Pb collisions. The invariant mass and transverse momentum distributions for ρ0 pro- duction are studied in the π+ π− decay channel at mid-rapidity. The production cross section in the rapidity range |y| < 0.5 is found to be d σ /dy = 425 ± 10 (stat.) +42 −50 (sys.) mb. Coherent ρ0 produc- tion is studied with and without requirement of nuclear breakup, and the fractional yields for various breakup scenarios are presented. The results are compared with those from lower energies and with model predictions.

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