6533b838fe1ef96bd12a47c3
RESEARCH PRODUCT
The rate of photon production in the quark-gluon plasma from lattice QCD
Aman SteinbergAman SteinbergArianna ToniatoMarco CèMarco CèTim HarrisHarvey B. Meyersubject
QuarkParticle physicsPhotonNuclear Theorynucl-thHigh Energy Physics::LatticePhoton Production RateFOS: Physical scienceshep-latLattice QCD7. Clean energy01 natural sciencesNuclear Theory (nucl-th)High Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciences010306 general physicsLinear combinationAnsatzParticle Physics - PhenomenologyQuantum chromodynamicsPhysics010308 nuclear & particles physicsHigh Energy Physics - Lattice (hep-lat)High Energy Physics::Phenomenologyhep-phParticle Physics - LatticeLattice QCDPolarization (waves)3. Good healthHigh Energy Physics - PhenomenologyNuclear Physics - TheoryQuark–gluon plasmaQuark-Gluon PlasmaHigh Energy Physics::Experimentdescription
We calculate the thermal rate of real-photon production in the quark-gluon plasma at a temperature of $T=254$ MeV using lattice QCD. The calculation is based on the difference between the spatially transverse and longitudinal parts of the polarization tensor, which has the advantage of falling off rapidly at large frequencies. We obtain this linear combination in the time-momentum representation from lattice QCD with two flavors of quarks in the continuum limit with a precision of about two parts per mille. Applying a theoretically motivated fit ansatz for the associated spectral function, we obtain values for the photon rate that are in line with QCD weak-coupling calculations; for photon momenta $ 1.0\leq k[{\rm GeV}]\leq 1.4$, our non-perturbative results constrain the rate to be no larger than twice the weak-coupling prediction. We also provide a physics interpretation of the electromagnetic spectral functions valid for all frequencies and momenta.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-10 |