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Testing thermal photon and dilepton rates
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abstract
We confront the thermal NLO vector spectral function (both the transverse and longitudinal channel with respect to spatial momentum, both above and below the light cone) with continuum-extrapolated lattice data (both quenched and with $N_{\rm f} = 2$, at $T \sim 1.2 T_{\rm c}$). The perturbative side incorporates new results, whose main features are summarized. The resolution of the lattice data is good enough to constrain the scale choice of $\alpha_{\rm s}$ on the perturbative side. The comparison supports the previous indication that the true spectral function falls below the resummed NLO one in a substantial frequency domain. Our results may help to scrutinize direct spectral reconstruction attempts from lattice QCD.
Forward citations
Cited by 3 Pith papers
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Bremsstrahlung photon contributions to parton energy loss at high virtuality ($Q^2$) : a perturbative calculation at $O(\alpha_{s} \alpha_{em})$
A first perturbative derivation of medium-induced photon bremsstrahlung kernels at O(alpha_s alpha_em) from high-virtuality quarks, with heavy quark masses and fermion-boson conversion.
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Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions
Using next-to-leading-order rates, the paper predicts that dilepton polarization changes sign and magnitude in low and intermediate invariant-mass ranges, making it a sensitive probe of gluonic processes and pre-equil...
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The spectral reconstruction problem for thermal photon and dilepton rates
A proceedings review presents an improved estimator (lambda = 2) and new lattice QCD estimates for the thermal photon production rate from quark-gluon plasma.
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