Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-03
AIP Conf.Proc.1343:450-452,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, 2 figures. Contributed to the International Conference on Quark Confinement and the Hadron Spectrum IX, Madrid, Augus
Scientific paper
10.1063/1.3575058
At finite density parity can be spontaneously broken in strong interactions with far reaching implications. In particular, a time-dependent pseudoscalar background would modify QED by adding a Chern-Simons term to the lagrangian. As a striking consequence we propose a novel explanation for the dilepton excess observed in heavy ion collisions at low invariant masses. The presence of local parity breaking due to a time-dependent pseudoscalar condensate substantially modifies the dispersion relation of photons and vector mesons propagating in such a medium, changing the $\rho$ spectral function and resulting in a potentially large excess of dileptons with respect to the predictions based in a `cocktail' of known processes.
Andrianov Alexander A.
Andrianov Vladimir
Espriu Domenec
Planells Xumeu
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