Photoproduction of ρ0 in ultra_peripheral nuclear collisions at ALICE

International Workshop on Discovery Physics at the LHC 2012

Skjerdal, Kyrre^1

Department of Physics and Technology, University of Bergen, PO Box 7803, 5020 Bergen, Norway^1

关键词: Analysis of data;    Center-of-mass energies;    Heavy ion collision;    Mid-rapidity;    Nuclear collisions;    Photon flux;    Photoproductions;    To a very large;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/455/1/012010/pdf
DOI  :  10.1088/1742-6596/455/1/012010

来源: IOP

【 摘 要 】

Photoproduction of ρ0mesons in ultra-peripheral Pb+Pb collisions has been studied by the ALICE Collaboration at the CERN LHC. The strong photon flux associated with relativistic charged nuclei leads to a very large cross section for exclusive photoproduction of ρ0meson in interactions of the type Pb + Pb → Pb + Pb + ρ0. For a ρ0produced at mid-rapidity at the LHC, the photon-nucleus center of mass energy is higher than in any previous experiment. The ALICE detector is a general purpose detector dedicated to study heavy-ion collisions. ALICE has excellent performance in the low pTregion, and can reconstruct charged particle tracks with 0.1 GeV/c ≤ pT ≤ 100 GeV/c. In this analysis all tracks were required to be within ALICE's central barrel. Analysis of data from the first heavy ion run at the LHC in 2010 will be discussed in this paper.