Thermal photon to dilepton ratio in ultra-relativistic heavy ion collisions
Jajati K. Nayak, Jane Alam, Sourav Sarkar, Bikash Sinha
TL;DR
This paper investigates the ratio of thermal photon to dilepton transverse momentum distributions in ultra-relativistic heavy ion collisions, proposing it as a tool to estimate initial temperature and radial flow effects.
Contribution
It introduces the thermal photon to dilepton ratio as a novel observable for probing initial conditions and flow dynamics in heavy ion collisions.
Findings
The ratio reaches a plateau at high transverse momentum.
Large radial flow causes the plateau to disappear.
The ratio's sensitivity to input parameters is analyzed.
Abstract
The ratio of transverse momentum distribution of thermal photons to dilepton has been evaluated. It is observed that this ratio reaches a plateau beyond a certain value of transverse momentum. We argue that this ratio can be used to estimate the initial temperature of the system by selecting the transverse momentum and invariance mass windows judiciously. It is demonstrated that if the radial flow is large then the plateau disappear and hence a deviation from the plateau can be used as an indicator of large radial flow. The sensitivity of the results on various input parameters has been studied.
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