Speaker
Ardit Krasniqi
(Johannes Gutenberg Universität Mainz)
Description
The thermal photon emissivity at the QCD chiral crossover is
investigated using imaginary momentum correlators. These have been
measured on a newly generated $20 \times 96^3$ lattice-QCD ensemble
with $\mathrm{O}(a)$-improved Wilson quarks and physical up, down and
strange quark masses at a temperature $T=154$ MeV near the
pseudo-critical temperature. In order to realize the photon on-shell
condition, the spatially transverse Euclidean correlators have to be
evaluated at imaginary spatial momenta.
Employing a bounding method, we present a preliminary result on the
quantity $H_E(\omega_1)$, which corresponds to an energy-moment of the
photon spectral function $\sigma(\omega)$.
| Topical area | QCD at Non-zero Temperature |
|---|
Primary authors
Ardit Krasniqi
(Johannes Gutenberg Universität Mainz)
Csaba Török
(Johannes-Gutenberg University Mainz)
Harvey B. Meyer
(Johannes Gutenberg University Mainz)
Marco Cè
(Università di Milano-Bicocca)
Tim Harris
(Institute for Theoretical Physics, ETH Zurich)