TL;DR
This paper reviews how prompt photons serve as probes in QCD phenomenology across various collision types, helping to understand parton distributions and fragmentation functions, including their medium modifications.
Contribution
It provides a comprehensive review of prompt photon production as a tool for probing parton distribution and fragmentation functions in different collision environments.
Findings
Prompt photons effectively probe parton distribution functions.
Prompt photons reveal medium modifications of fragmentation functions.
The review highlights the role of prompt photons in understanding QCD phenomena.
Abstract
The QCD phenomenology of prompt photon production from e-p to p-p/p-pbar and A-A collisions is reviewed. The use of prompt photons as a probe of (i) parton distribution functions (in a proton or in nuclei) as well as (ii) fragmentation functions (into photons and hadrons) and their medium-modifications is highlighted.
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