Geodesic
Abnormal enhancement of dilepton yield in central heavy-ion collisions from local parity breaking
Teoretičeskaâ i matematičeskaâ fizika, Tome 170 (2012) no. 1, pp. 22-33
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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. 
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A. A. Andrianov; V. A. Andrianov; D. Espriu; X. Planells. Abnormal enhancement of dilepton yield in central heavy-ion collisions from local parity breaking. Teoretičeskaâ i matematičeskaâ fizika, Tome 170 (2012) no. 1, pp. 22-33. http://geodesic.mathdoc.fr/item/TMF_2012_170_1_a1/

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