The rate of photon production in the quark-gluon plasma from lattice QCD

Abstract

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 $1.0\le k[\mathrm{GeV}]\le 1.4$, 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.

arXiv comment7 pages, 4 figures, one table

References in corpus (28)

• The chiral and deconfinement aspects of the QCD transition
• Is there still any Tc mystery in lattice QCD? Results with physical masses in the continuum limit III
• Properties and uses of the Wilson flow in lattice QCD
• Transport coefficients in high temperature gauge theories: (II) Beyond leading log
• Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results
• The QCD phase transition with physical-mass, chiral quarks
• The production of photons in relativistic heavy-ion collisions
• Properties of hot and dense matter from relativistic heavy ion collisions
• Speeding up the Hybrid-Monte-Carlo algorithm for dynamical fermions
• Lightest sterile neutrino abundance within the nuMSM
• Photon and dilepton production in supersymmetric Yang-Mills plasma
• Direct photon production in Pb-Pb collisions at $\sqrt{s_\rm{NN}}$ = 2.76 TeV
• Lattice QCD with open boundary conditions and twisted-mass reweighting
• The strange quark mass and Lambda parameter of two flavor QCD
• Transport Properties of the Quark-Gluon Plasma -- A Lattice QCD Perspective
• Thermal Photons and Collective Flow at the Relativistic Heavy-Ion Collider
• Next-to-leading order thermal photon production in a weakly coupled quark-gluon plasma
• Thermal photons as a quark-gluon plasma thermometer revisited
• On the hadronic contribution to sterile neutrino production
• Azimuthally anisotropic emission of low-momentum direct photons in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Thermal dilepton rates and electrical conductivity of the QGP from the lattice
• Direct real photons in relativistic heavy ion collisions
• On the strength of the $U_A(1)$ anomaly at the chiral phase transition in $N_f=2$ QCD
• Lattice constraints on the thermal photon rate
• Direct photon elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• An estimate for the thermal photon rate from lattice QCD
• Testing thermal photon and dilepton rates
• Euclidean correlators at imaginary spatial momentum and their relation to the thermal photon emission rate

Cited by in corpus (9)

• Perturbative Thermal QCD: Formalism and Applications
• The Present and Future of QCD
• Vacuum correlators at short distances from lattice QCD
• The nonperturbative contribution to asymptotic masses
• Spectral and transport properties from lattice QCD
• Lattice QCD estimates of thermal photon production from the QGP
• Electrical conductivity of the quark-gluon plasma from the low energy limit of photon and dilepton spectra
• Photon production rate from Transverse-Longitudinal ($T-L$) mesonic correlator on the lattice
• Photon emissivity of the quark-gluon plasma: a lattice QCD analysis of the transverse channel