Speaker
Description
Thermal photons from the QGP provide important information about the interaction among the plasma constituents. The photon production rate from a thermally equilibrated plasma is proportional to the transverse spectral function $\rho_T$(𝑘0=|𝑘⃗ |,𝑘⃗ ). Photon production rates can also be calculated from the difference between $\rho_T$(transverse) and $\rho_L$(longitudinal) correlator as $\rho_L$ vanishes on the photon point. The IR part of $\rho_T-\rho_L$ dominates, and therefore the corresponding Euclidean correlator receives most of its contribution from the IR region. We calculate the correlator of $\rho_T-\rho_L$on $𝑁_f$=2+1 flavor HISQ configurations with $m_l=m_s/5$ at temperatures ∼1.15𝑇𝑐 and ∼1.3𝑇𝑐. We have used various ansätze of the spectral function, which are 1) Polynomial ansatz of the spectral function connected to the UV perturbative region and 2) Hydro-inspired spectral function. We have also used the Backus-Gilbert method to estimate the spectral function. We will show the comparison of the photon production rate estimated from all these different methods.
| Session | Heavy Ions and QCD |
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