Vector-meson-dominance model for radiative decays involving light scalar mesons

Area of Science:

• Particle physics
• Quantum chromodynamics
• Hadron spectroscopy

Background:

• Vector-dominance model (VDM) is crucial for understanding meson decays.
• Scalar (S) and vector (V) mesons exhibit interesting decay patterns.
• Isospin violation in meson mixing is a key area of study.

Purpose of the Study:

• To investigate meson decay amplitudes using a VDM.
• To analyze the impact of isospin violating mixing on specific decay ratios.
• To evaluate a recent proposal concerning phi meson decays.

Main Methods:

• Development of a three-parameter vector-dominance model.
• Calculation of decay amplitudes for S-->gammagamma, V-->Sgamma, and S-->Vgamma.
• Application of the model to study Gamma(phi-->f(0)gamma)/Gamma(phi-->a(0)(0)gamma).

Main Results:

• The model successfully predicts numerous meson decay amplitudes.
• The contribution of isospin violating a(0)(0)-f(0) mixing to the studied ratio is found to be small.
• The VDM provides a framework for detailed analysis of meson decay processes.

Conclusions:

• The vector-dominance model offers a robust tool for meson decay studies.
• The investigated isospin violating mixing effect is not significant for the phi decay ratio.
• Further research can utilize this model for exploring other meson decay phenomena.