Excess of soft dielectrons and photons

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.

arXiv comment10 pages, 2 Figures

References in corpus (6)

• Physics of Ultra-Peripheral Nuclear Collisions
• Interference in Exclusive Vector Meson Production in Heavy Ion Collisions
• Two-photon production of dilepton pairs in peripheral heavy ion collisions
• Coherent photo-produced J$/\psi$ and dielectron yields in isobaric collisions
• Double scattering production of two positron-electron pairs in ultraperipheral heavy-ion collisions
• Exclusive vector meson production in heavy ion collisions

Cited by in corpus (1)

• Explaining The XENON1T Excess With Light Goldstini Dark Matter