Harvey B. Meyer (Johannes Gutenberg University Mainz)
The photon emissivity of the quark-gluon plasma (QGP) is an important input to predict the photon yield in heavy-ion collisions, particularly for transverse momenta in the range of 1 to 2 GeV. Photon production in the QGP can be probed non-perturbatively in lattice QCD via (Euclidean) time-dependent correlators. Analyzing the spatially transverse channel, as well as the difference of the transverse and longitudinal channels as a consistency check, we determine the photon emissivity based on continuum-extrapolated correlators in two-flavour QCD. Estimates of the lepton-pair production rate can be derived by combining the two aforementioned channels.
Ardit Krasniqi Harvey B. Meyer (Johannes Gutenberg University Mainz) Csaba Török (Johannes Gutenberg Universität Mainz) Marco Cè (AEC and ITP, Universität Bern) Tim Harris (University of Edinburgh)