Abstract
Measurement of isolated photon gives a possibility to constrain the nuclear parton distribution functions (nPDF). The isolated photon is also the clear tag in the photon-jet channel for studying in-medium modifications of fragmentation functions of parton initiated jets. The performance of isolated photon reconstruction and identification has been studied in PbPb collisions at √SNN = 5.02 TeV. Trigger, reconstruction and isolation efficiencies are measured in PYTHIA+HYDJET Monte-Carlo simulation. We describe signal template method to determine the purity of isolated photons.
Highlights
Prompt photons coming from the primary vertex of the high energy hadron collisions are unaffected by the strongly interacting medium produced in the reaction
Reconstruction efficiency is the fraction of reconstructed photons in generated photons without isolation condition as shown in Figure 2 left panel
Isolation Efficiency is defined as reconstructed photons passing isolation selection in all reconstructed photons
Summary
Prompt photons coming from the primary vertex of the high energy hadron collisions are unaffected by the strongly interacting medium produced in the reaction. Prompt photons are the ‘clean’ probes of the initial state of the collision and play key roles in better understanding the Quark-Gluon Plasma (QGP). Isolated photons include prompt photons and collinear fragmentation photons of a parton producing large transverse momentum. The performance of reconstruction lated photons has been studied with data collected in 2015 PbPb collisions aatnd√isdNeNnt=ifi5c.a0t2ioTneoVf isoand. In this analysis, isolated photon performances have been studied with respect to its transverse momentum and centrality, which is defined by the impact parameter b. Centrality is expressed as a percentage of the total nuclear interaction cross-section
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