Enhancement of low-mass dileptons in ultraperipheral collisions

  title={Enhancement of low-mass dileptons in ultraperipheral collisions},
  author={I. M. Dremin and Sergey Gevorkyan and D. Madigozhin},
  journal={The European Physical Journal C},
It is shown that production of low-mass e+e-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$e^+e^-$$\end{document}-pairs in ultraperipheral nuclear collisions is enhanced due to the Sommerfeld–Gamow–Sakharov (SGS) factor. This effect is especially strong near the threshold of creation of unbound e+e-\documentclass… 

Positronia’ Clouds in Universe

The intense emission of 511 keV photons from the Galactic center and within terrestrial thunderstorms is attributed to the formation of parapositronia clouds. Unbound electron–positron pairs and

Nonequilibrium Properties of Quark–Gluon Matter at NICA Energies

  • I. Dremin
  • Physics
    Physics of Particles and Nuclei
  • 2021
Theoretical search for observable effects in pp and AuAu collisions at NICA energies is the main aim of studies of the LPI group. The topics are widely spread from internal strucfure of colliding



Excess of Soft Dielectrons and Photons

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.

On relativization of the Sommerfeld-Gamow-Sakharov factor

A bstractThe Sommerfeld-Gamow-Sakharov factor is considered for the general case of arbitrary masses and energies. It is shown that the scalar triangular one-loop diagram gives the Coulomb

Sommerfeld enhancement: general results from field theory diagrams

Assuming that two incoming annihilating particles interact by exchanging a generally massive attractive vector (or scalar) boson, we find, by taking the non-relativistic limit of the field theory

Sommerfeld factor for arbitrary partial wave processes

The Sommerfeld factor for arbitrary partial wave processes is derived in the non-relativistic limit. The s-wave and p-wave numerical results are presented for the case of Yukawa interactions. An

Gamma-ray spectroscopy of Positron Annihilation in the Milky Way

The annihilation of positrons in the Galaxy's interstellar medium produces characteristic gamma-rays with a line at 511 keV. This emission has been observed with the spectrometer SPI on INTEGRAL,

Positron clouds within thunderstorms

We report the observation of two isolated clouds of positrons inside an active thunderstorm. These observations were made by the Airborne Detector for Energetic Lightning Emissions (ADELE), an array

Sulla Nascita di Coppie per Urti di Particelle Elettrizzate

SuntoLa sezione efficace per la nascita di coppie negli urti di particelle elettrizzate viene calcolata col metodo delle perturbazioni, considerando l’interazione tra un elettrone in uno stato di

Production of dimeson atoms in high-energy collisions

Abstract.The production of two-meson electromagnetic bound states and free meson pairs $ \pi^+\pi^-$π+π- , $ K^+K^-$K+K- , $ \pi^+K^{\mp}$π+K∓ in relativistic collisions has been considered. It is

Interaction of the electron and the positron in pair production

The influence of the interaction of the components on the differential probability of pair production is studied.