Coherent ρ^0 photoproduction in ultra-peripheral Pb-Pb collisions at √sNN = 2.76 TeV

Adam, J. and Antičić, Tome and Erhardt, Filip and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Zyzak, M. (ALICE Collaboration) (2015) Coherent ρ^0 photoproduction in ultra-peripheral Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2015 (9). pp. 95-27. ISSN 1029-8479

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Abstract

We report the first measurement at the LHC of coherent photoproduction of ρ 0 mesons in ultra-peripheral Pb-Pb collisions. The invariant mass and transverse momentum distributions for ρ 0 production 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 dσ/dy = 425 ± 10 (stat.) +42 −50 (sys.) mb. Coherent ρ 0 production 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.

Item Type: Article
Keywords: ρ0, photoproduction, ultra-peripheral, Pb–Pb, 2.76 TeV
Date: September 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: Open Access. © Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. Received: April 1, 2015. Revised: July 22, 2015. Accepted: August 21, 2015 Published: September 15, 2015.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Nikola Poljak
Date Deposited: 28 May 2016 20:11
Last Modified: 28 May 2016 20:11
URI: http://digre.pmf.unizg.hr/id/eprint/4863

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