Isospin violation in {phi}, J/{psi}, {psi}{sup '}{yields}{omega}{pi}{sup 0} via hadronic loops
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
- China
In this work, we study the isospin-violating decay of {phi}{yields}{omega}{pi}{sup 0} and quantify the electromagnetic (EM) transitions and intermediate meson exchanges as two major sources of the decay mechanisms. In the EM decays, the present datum status allows a good constraint on the EM decay form factor in the vector meson dominance model, and it turns out that the EM transition can only account for about 1/4{approx}1/3 of the branching ratio for {phi}{yields}{omega}{pi}{sup 0}. The intermediate meson exchanges, KK(K*) (intermediate KK interaction via K* exchanges), KK*(K) (intermediate KK* rescattering via kaon exchanges), and KK*(K*) (intermediate KK* rescattering via K* exchanges), which evade the naive Okubo-Zweig-Iizuka rule, serve as another important contribution to the isospin violations. They are evaluated with effective Lagrangians where explicit constraints from experiment can be applied. Combining these three contributions, we obtain results in good agreement with the experimental data. This approach is also extended to J/{psi}({psi}{sup '}){yields}{omega}{pi}{sup 0}, where we find contributions from the KK(K*), KK*(K), and KK*(K*) loops are negligibly small, and the isospin violation is likely to be dominated by the EM transition.
- OSTI ID:
- 21035693
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 1; Other Information: DOI: 10.1103/PhysRevD.77.014010; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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