This article is cited in 9 papers

Abnormal enhancement of dilepton yield in central heavy-ion collisions from local parity breaking

A. A. Andrianov^ab, V. A. Andrianov^a, D. Espriu^bc, X. Planells<sup>b

a</sup> Saint Petersburg State University, St.~Petersburg, Russia
^b Universitat de Barcelona
^c CERN, Geneva, Switzerland

Abstract: We propose a new explanation for the dilepton excess observed in dense (hot) nuclear matter at invariant masses below $1$ GeV. We argue that the presence of local parity breaking due to a time-dependent isosinglet and/or isotriplet pseudoscalar condensate may substantially modify the dispersion relation of photons and vector mesons propagating in such a medium, resulting in an abnormally large excess of $e^+e^-$ pairs with respect to the common theoretical predictions based on a “cocktail” of hadronic processes. We propose various signatures to prove or disprove this effect.

Keywords: superdense baryonic matter at high temperatures, spontaneous parity breaking.

Received: 19.01.2012

DOI: 10.4213/tmf6743

 English version: Theoretical and Mathematical Physics, 2012, 170:1, 17–25

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