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Authors = Dmitri Peresunko ORCID = 0000-0003-3709-5130

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15 pages, 1349 KiB  
Article
Direct Photon Production in Heavy-Ion Collisions: Theory and Experiment
by Dmitry Blau and Dmitri Peresunko
Particles 2023, 6(1), 173-187; https://doi.org/10.3390/particles6010009 - 30 Jan 2023
Cited by 3 | Viewed by 3087
Abstract
Direct photons provide a possibility to test properties of hot matter created in proton–proton (pp), proton–nucleus (p–A) or nucleus–nucleus (A–A) collisions. As they are created in charged particles’ scatterings and freely escape the hot region, they provide a tool to test all stages [...] Read more.
Direct photons provide a possibility to test properties of hot matter created in proton–proton (pp), proton–nucleus (p–A) or nucleus–nucleus (A–A) collisions. As they are created in charged particles’ scatterings and freely escape the hot region, they provide a tool to test all stages of the collision: the scattering of the partons of incoming nucleons, pre-equilibrium evolution and collective expansion of hot quark–gluon matter created in nucleus–nucleus collisions. Comparing direct photon production in pp, p–A and A–A collisions, one can check the scaling with the number of binary collisions expected at a high transverse momentum range and obtain insight into the hot and cold hadronic matter properties with soft photons. The collective elliptic flow of direct photons is a unique possibility to trace the collective flow formation and space–time evolution of the fireball. We review the experimental results on direct photon production in pp, p–A and A–A collisions at the Super Proton Synchroton (SPS), the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) energies and discuss an agreement of theoretical predictions with measurements. Finally, we present predictions of direct photon spectra and collective flow for lower energy collisions expected at the Nuclotron-based Ion Collider fAcility (NICA) and the Facility for Antiproton and Ion Research (FAIR). Full article
(This article belongs to the Special Issue Selected Papers from "Physics Performance Studies at FAIR and NICA")
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10 pages, 1754 KiB  
Article
Approaches to Measuring Direct Photon Yield in A–A Collisions
by Dmitri Peresunko
Particles 2022, 5(2), 188-197; https://doi.org/10.3390/particles5020017 - 9 Jun 2022
Viewed by 1985
Abstract
An overview of experimental methods for measuring direct photon spectra in pp, p–A and A–A collisions is presented. The advantages and limitations of each method are discussed and illustrated by the results of various experiments. Full article
(This article belongs to the Special Issue Selected Papers from "Physics Performance Studies at FAIR and NICA")
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