Isospin violation in {phi}, J/{psi}, {psi}{sup '}{yields}{omega}{pi}{sup 0} via hadronic loops

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.014010· OSTI ID:21035693

Gang, Li ^[1]; Qiang, Zhao ^[1]; Bingsong, Zou ^[1]; CCAST, Beijing 100080 ^[2]

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1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
2. 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSON-EXCHANGE MODELS
BRANCHING RATIO
FORM FACTORS
HADRONIC PARTICLE DECAY
ISOSPIN
J PSI-3097 MESONS
K*-892 MESONS
KAONS
LAGRANGIAN FUNCTION
OMEGA-782 MESONS
PHI-1020 MESONS
PIONS NEUTRAL
QUANTUM CHROMODYNAMICS
RESCATTERING
VECTOR DOMINANCE MODEL