6533b830fe1ef96bd1297c94
RESEARCH PRODUCT
An estimate for the thermal photon rate from lattice QCD
Harvey B. MeyerAman SteinbergTim HarrisAnthony FrancisBastian B. Brandtsubject
PhysicsParticle physicsPhoton010308 nuclear & particles physicsPhysicsQC1-999High Energy Physics::LatticeHigh Energy Physics - Lattice (hep-lat)Phase (waves)FOS: Physical sciencesFermionLattice QCD01 natural sciencesCorrelation function (statistical mechanics)High Energy Physics - Lattice0103 physical sciencesThermalRange (statistics)010306 general physicsEuclidean vectordescription
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 {\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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-10-19 |