Apr 4 – 10, 2022
Auditorium Maximum UJ
Europe/Warsaw timezone
Proceedings submission deadline extended to August 15, 2022

Lattice QCD calculation of thermal photon rate

Apr 6, 2022, 7:10 PM
Poster QCD matter at finite temperature and density Poster Session 2 T03


Dibyendu Bala


Thermal photons from the QGP provide important information about the interaction among the plasma constituents. The thermal photon production rate from a thermally equilibrated plasma is proportional to the transverse spectral function $\rho_{T}(k_0=|\vec k|,\vec k)$. One can calculate the photon production rate also from the difference between $\rho_{T}$ and $\rho_{L}$(longitudinal) correlator as $\rho_{L}$ vanishes on the photon point. The UV part of $\rho_{T}-\rho_{L}$ is not dominant and therefore the corresponding Euclidean correlator gets most of the contribution from the IR part of $\rho_{T}-\rho_{L}$. We calculate the continuum extrapolated T-L correlator non-perturbatively on the lattice at 1.1$T_c$ and 1.5$T_c$ for a gluonic medium. We will present the extraction of spectral function from this Euclidean correlator using a hydrodynamic inspired model in combination with the Backus-Gilbert method, which allows us to estimate the photon production rate at these temperatures.

Primary author


Greg Jackson (INT, University of Washington) Olaf Kaczmarek

Presentation materials