Speaker
Description
Photons are radiated during all stages of heavy-ion collisions, including from the hot and dense quark-gluon plasma (QGP). In this talk, we consider the polarization of these QGP photons. The polarization, albeit difficult to measure, gives detailed information about how the anisotropy of the QGP medium evolves and thus how the medium isotropizes during the initial stages of collisions. We evaluate for the first time the emission of polarized photons through bremsstrahlung and quark-antiquark pair annihilation in an anisotropic QGP medium, including the Landau-Pomeranchuk-Migdal effect fully. We then show that the polarization goes directly as the anisotropy of the soft gluon cloud radiated by quarks and gluons. Finally, we discuss the size of photon polarization in LHC experiments, feasibility of measuring it and implications of our work for dileptons.
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