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Deep inelastic scattering off quark-gluon plasma and its photon emissivity
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The photon emissivity of quark-gluon plasma probes the interactions in the medium and differs qualitatively between a weakly coupled and a strongly coupled plasma in the soft-photon regime. The photon emissivity is given by the product of kinematic factors and a spectral function associated with the two-point correlator of the electromagnetic current at lightlike kinematics. A certain Euclidean correlator at imaginary spatial momentum can be calculated in lattice QCD and is given by an integral over the relevant spectral function at lightlike kinematics. I present a first exploratory lattice calculation of this correlator. Secondly, I show how Euclidean correlators at imaginary spatial momenta can also be used to probe the regime of deep inelastic scattering off quark-gluon plasma, which reveals its parton distribution function.
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Probing how bright the quark-gluon plasma glows in lattice QCD
At T≈254 MeV, lattice QCD gives -[HE(ω2)-HE(ω1)]/T^2 = 0.193(74), on the low side of the AMY weak-coupling prediction interval [0.25,0.30].
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