The multiplets of finite width 0 mesons and encounters with exotics
نویسنده
چکیده
Complex-mass (finite-width) 0 nonet and decouplet are discussed in exotic commutator method approach. Besides of the known mass formulae for real parts of the complex masses, one gets relations for total widths of the particles. It is shown that anomalies of the widths of f0(980) and a0(980) mesons do not justify rejecting the qq̄ structure for them; the reduction of their widths follows from an extra unflavor mechanism suppressing decay. In the decouplet, the extra singlet state (glueball) is distributed between the states of f0(1370) and f0(1500) mesons. All known scalar mesons with the mass smaller than 2000 MeV (excluding σ(600)) and one with the mass 2200 ÷ 2400 MeV belong to the nonet or decouplet. The meson σ(600) does not mix with other particles.
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