Phenomenological Analysis of Diphoton Production with Medium-modified Quark Masses

In this paper, the properties of Quark–Gluon Plasma (QGP) are investigated by studying the production rate of diphotons as a function of their invariant mass. Since diphotons are non-interactive constituents and carry information from initial phase to final phase, they are treated as a special probe. The current work is an extension of Kumar et al. [Phys. Scr. 96, 124060 (2021)], in which thermal quark mass is utilized. Considering parton’s thermal interactions, we use a phenomenological quasi-particle approach which combines a thermally generated mass, the current mass, and a term connecting the two, which is used as effective quark mass. The effective quark mass replaces the role of the thermal quark mass, and the resulting diphoton production rate spectra are in good agreement with those obtained in previous theoretical studies. The model results serve as a benchmark for evaluating diphoton yields across different quasi-particle treatments. Therefore, the modified quasi-particle model does not invalidate the calculation of the diphoton production rate and helps us better understand the evolution of the QGP through its electromagnetic signals by providing a framework for studying experimental data from heavy-ion collisions at RHIC and the LHC. Abstract Published by the Jagiellonian University 2026 authors