2003/07/31 by Pedro Costa, M. C. Ruivo, Yu. L. Kalinovsky
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1016/j.physletb.2003.10.020
published as Phys.Lett. B577 (2003) 129-136; Erratum-ibid. B581 (2004) 274-275 · 12 pages, 4 figures included; revised version, to be published in Phys. Lett. B
arxiv created 2003/10/30 · arxiv updated 2009/12/01
We study the anomalous decays π0, η→γγ in the framework of the three--flavor Nambu--Jona-Lasinio [NJL] model, in the vacuum and in quark matter in β --equilibrium. It is found that the behavior of the relevant observables essentially reflects a manifestation of the partial restoration of chiral symmetry, in non strange and strange sectors. The probability of such decays decreases with density, showing that anomalous mesonic interactions are significantly affected by the medium.