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arXiv · 2208.00842

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

Sergei Nedelko·Aleksei Nikolskii
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Abstract

The photon production due to conversion of two gluons into a photon, $gg\rightarrow\gamma$, in the presence of the background gauge fields is studied within the specific mean-field approach to QCD vacuum. In this approach, mean field in the confinement phase is represented by the statistical ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase can be characterized by the purely chromomagnetic fields. The probability of gluon conversion of two gluons into a photon vanishes in the confinement phase due to the randomness of the background field configurations. The anisotropic strong electromagnetic field, generated in the collision of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of an anisotropic purely chromomagnetic mean field. Respectively, deconfined phase is characterized by nonzero probability of the conversion of two gluons into a photon with strongly anisotropic angular distribution.

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Sergei Nedelko, Aleksei Nikolskii. 2022-08-01. Photons production in heavy-ion collisions as a signal of deconfinement phase. https://doi.org/10.1140/epja%2Fs10050-023-00986-w

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