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28 March 2024
 
  » arxiv » 1710.7050

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An estimate for the thermal photon rate from lattice QCD
Bastian B. Brandt ; Anthony Francis ; Tim Harris ; Harvey B. Meyer ; Aman Steinberg ;
Date 19 Oct 2017
AbstractWe 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 {pi}T/2 to 2{pi}T. The relevant Euclidean vector current correlation functions are computed with $N_{mathrm f}$ = 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 model-independent estimate from the Backus-Gilbert method to give an estimate for the photon rate.
Source arXiv, 1710.7050
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