Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-03
Physics
High Energy Physics
High Energy Physics - Phenomenology
LateX, 16 pages
Scientific paper
In the framework of $U(3)_L\times U(3)_R$ chiral field theory, Dashen's theorem is reexamined, and the well-known result of $m_{\pi^\pm}^2-m_{\pi^0}^2$ obtained by Das, Guralnik, Mathur, Low, and Young is reproduced. We find that Dashen's theorem, which automatically holds for pseudoscalar mesons in this theory, can be generalized to the sector of axial-vector mesons, however, fails for the sector of vector mesons.
Gao Dao-Neng
Yan Mu-Lin
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