Electromagnetic probes of strongly magnetized quark-gluon plasma

The polarization effects of a strongly magnetized quark-gluon plasma are studied at finite temperature and nonzero baryon chemical potential. It is found that a background magnetic field can have a strong effect on the photon and dilepton emission rates. It affects not only the total rate but also the angular dependence. In particular, the Landau-level quantization leads to a nontrivial momentum dependence of the photon ellipticity coefficient on transverse momentum. It is proposed that the anisotropy of the photon and dilepton emission may serve as indirect measurements of the magnetic field.