Photons production in heavy ion collisions as a signal of deconfinement phase

The production of photons in the process of gluon conversion $gg\rightarrow\gamma$ in the presence of background gauge fields is studied within the mean-field approach to QCD vacuum, the domain model of QCD vacuum and hadronization. In this approach, Abelian (anti-)self-dual gluon mean field dominates the confinement phase while the deconfined phase can be characterized by the strong chromomagnetic fields. It is shown that, due to the randomness of the vacuum mean fields, the probability of conversion of two gluons into photon vanishes in confinement phase. In contrast, a strong electromagnetic field, generated in the collision processes of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of mean chromomagnetic field that is singled out in the spacial direction, which leads to nonzero probability of the conversion of two gluons into a photon. The angular distribution of the generated photons is expected to be strongly anisotropic.