Anomalous decay of pion and eta at finite density

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...

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Bibliographic Details
Published in:Physics letters. B 2003-12, Vol.577 (3-4), p.129-136
Main Authors: Costa, P., Ruivo, M.C., Kalinovsky, Yu.L.
Format: Article
Language:English
Subjects:
Eta decay width
Finite density
NJL model
Pion decay width
Pseudoscalar mesons
Strange quark matter
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Summary: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 nonstrange and strange sectors. The probability of such decays decreases with density, showing that anomalous mesonic interactions are significantly affected by the medium.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2003.10.020