Excess of soft dielectrons and photons

TL;DR

This paper calculates the spectra of soft dielectrons and photons from ultraperipheral collisions, highlighting their abundance and potential relevance to astrophysical phenomena like galactic center emissions.

Contribution

It provides theoretical spectra predictions for dielectrons and photons at NICA energies, linking collider physics to astrophysical observations.

Findings

Soft dielectrons and photons are abundantly produced in ultraperipheral collisions.

The spectra at NICA energies are characterized and analyzed.

Potential implications for astrophysical processes like galactic center emissions are discussed.

Abstract

Spectra of unbound electron-positron pairs (dielectrons, in brief) and photons from decays of parapositronia produced in ultraperipheral collisions of electrically charged objects are calculated. Their shapes at energies of the NICA collider are demonstrated. Soft dielectrons and photons are abundantly produced. The relevance of these processes to the astrophysical problem of cooling electron-positron pairs and the intense emission of 511 keV photons from the Galactic center is discussed.