Dashen's theorem and electromagnetic masses of the mesons

Abstract

Employing $U(3{)}_L\times U(3{)}_R$ chiral field theory, we find that Dashen's theorem, which holds for pseudoscalar mesons, can be generalized to the sector of axial-vector mesons, however, fails for vector mesons.

arXiv commentLaTeX file, 16 pages, no figures

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