Vector meson photoproduction in ultra-peripheral heavy ion collisions with ALICE at the LHC

Agostinelli, Andrea (2014) Vector meson photoproduction in ultra-peripheral heavy ion collisions with ALICE at the LHC , [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Fisica, 26 Ciclo. DOI 10.6092/unibo/amsdottorato/6225.
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Abstract

Ultra-relativistic heavy ions generate strong electromagnetic fields which offer the possibility to study γ-γ and γ-nucleus processes at the LHC in the so called ultra-peripheral collisions (UPC). The photoproduction of J/ψ vector mesons in UPC is sensitive to the gluon distribution of the interacting nuclei. In this thesis the study of coherent and incoherent J/ψ production in Pb-Pb collisions at √sNN = 2.76 TeV is described. The J/ψ has been measured via its leptonic decay in the rapidity range -0.9 < y < 0.9. The cross section for coherent and incoherent J/ψ are given. The results are compared to theoretical models for J/ψ production and the coherent cross section is found to be in good agreement with those models which include nuclear gluon shadowing consistent with EPS09 parametrization. In addition the cross section for the process γ γ→ e+e− has been measured and found to be in agreement with the STARLIGHT Monte Carlo predictions. The analysis has been published by the ALICE Collaboration in the European Physical Journal C, with one of its main plot depicted on the cover-front of the November 2013 issue.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Agostinelli, Andrea
Supervisore
Dottorato di ricerca
Scuola di dottorato
Scienze matematiche, fisiche ed astronomiche
Ciclo
26
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
Ultraperipheral, photoproduction, ALICE, gluon shadowing
URN:NBN
DOI
10.6092/unibo/amsdottorato/6225
Data di discussione
7 Marzo 2014
URI

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