UA(1) Breaking Effects on the Light Scalar Meson Spectrum | Zendy

K. Naito | Zendy; Makoto Oka | Zendy; M. Takizawa | Zendy; Toru Umekawa | Zendy

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UA(1) Breaking Effects on the Light Scalar Meson Spectrum

Author(s) -

K. Naito,

Makoto Oka,

M. Takizawa,

Toru Umekawa

Publication year - 2003

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.109.969

Subject(s) - physics , meson , particle physics , scalar (mathematics) , scalar meson , strangeness , rho meson , chiral symmetry breaking , symmetry breaking , nuclear physics , hadron , geometry , mathematics

Effects of the U_A(1) breaking interaction on the low-lying nonet scalarmesons are studied using the extended Nambu-Jona-Lasinio model. The strength ofthe U_A(1) breaking interaction is determined by the electromagnetic decays ofthe eta meson. We find that the U_A(1) breaking interaction gives rise to about150 MeV mass difference between the sigma and a_0 mesons. We also find that thestrangeness content in the \sigma meson is about 15%. The calculated mass ofthe I=1/2 state is about 200 MeV heavier than that of the I=1 state. The orderof these masses is not likely to change within this model.Comment: 10 pages, 3 figure

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