EPJ Web Conf.
Volume 175, 201835th International Symposium on Lattice Field Theory (Lattice 2017)
|Number of page(s)||15|
|Section||7 Nonzero Temperature and Density|
|Published online||26 March 2018|
An estimate for the thermal photon rate from lattice QCD
Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany
2 Dept. of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, Canada
3 Helmholtz-Institut Mainz, Johannes Gutenberg-Universität, 55099 Mainz, Germany
4 PRISMA Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg-Universität, 55128 Mainz, Germany
Published online: 26 March 2018
We estimate the production rate of photons by the quark-gluon plasma in lattice QCD. We propose a new correlation function which provides better control over the systematic uncertainty in estimating the photon production rate at photon momenta in the range πT/2 to 2πT. The relevant Euclidean vector current correlation functions are computed with Nf = 2 Wilson clover fermions in the chirally-symmetric phase. In order to estimate the photon rate, an ill-posed problem for the vector-channel spectral function must be regularized. We use both a direct model for the spectral function and a modelindependent estimate from the Backus-Gilbert method to give an estimate for the photon rate.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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