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Article overview
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U_A(1) Breaking Effects on the Light Scalar Meson Spectrum | Kenichi Naito
; Makoto Oka
; Makoto Takizawa
; Toru Umekawa
; | Date: |
8 May 2003 | Journal: | Prog.Theor.Phys. 109 (2003) 969-980 | Subject: | hep-ph | Abstract: | Effects of the U_A(1) breaking interaction on the low-lying nonet scalar mesons are studied using the extended Nambu-Jona-Lasinio model. The strength of the U_A(1) breaking interaction is determined by the electromagnetic decays of the eta meson. We find that the U_A(1) breaking interaction gives rise to about 150 MeV mass difference between the sigma and a_0 mesons. We also find that the strangeness content in the sigma meson is about 15%. The calculated mass of the I=1/2 state is about 200 MeV heavier than that of the I=1 state. The order of these masses is not likely to change within this model. | Source: | arXiv, hep-ph/0305078 | Services: | Forum | Review | PDF | Favorites |
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