Speaker
Description
Direct photons are considered as one of the most versatile and clean tools to study relativistic nuclear collisions. These include all photons except the ones from hadron decays. The direct photon spectrum produced in relativistic heavy ion collisions is dominated by prompt photons in the larger transverse momenta $(p_{\rm{T}} >3 \ {\rm GeV}$) region. Whereas, the thermal photons from the quark gluon plasma and hot hadron gas are the dominant contribution at relatively lower $p_{\rm{T}}$ range.
Measurements of direct photons are complicated due to the presence of a large decay background, especially from 2-$\gamma$ decay of $\pi^0$ and $\eta$ mesons. A selection called 'isolation criterion', which is based on a threshold on the contributions of transverse energy/momentum from particles inside a cone around the candidate photon, is applied to suppress the decay as well as the fragmentation photons. This has led to the prescription of 'isolated photons'.
In this contribution, we will present the dependence of the isolated photon cross section on the isolation criteria as studied using JETPHOX which is a parton level generator used to estimate the prompt photon production.
| Field of contribution | Phenomenology |
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