Implications of local parity breaking in heavy ion collisions

TL;DR

This paper proposes that local parity breaking caused by a time-dependent pseudoscalar condensate in heavy ion collisions can explain the observed excess of low-mass dileptons by modifying vector meson properties.

Contribution

It introduces a novel mechanism involving a dynamic pseudoscalar condensate to account for dilepton excess in heavy ion collision experiments.

Findings

Pseudoscalar condensate affects vector meson properties.

Explains the excess of low-mass dileptons.

Links local parity breaking to experimental observations.

Abstract

Recent data on dilepton production in heavy ion collisions revealed an abnormal excess in the region of invariant masses below 1 GeV. Our proposal is the creation of a slowly varying time-dependent pseudoscalar condensate within the hot nuclear fireball that comes from the very collision. The local parity breaking effect that immediately arises substantially modifies the vector meson properties leading to an excess of lepton pairs that could be a part of the explanation for the observed abnormal dilepton yield.