Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-02-14
Phys.Lett. B420 (1998) 8-12
Physics
Nuclear Physics
Nuclear Theory
To appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(97)01524-4
We apply the method of QCD sum rules in the presence of external electromagnetic fields $F_{\mu\nu}$ to the problem of the electromagnetic decays of various vector mesons, such as $\rho\to\pi\gamma$, $K^\ast\to K\gamma$ and $\eta'\to\rho\gamma$. The induced condensates obtained previously from the study of baryon magnetic moments are adopted, thereby ensuring the parameter-free nature of the present calculation. Further consistency is reinforced by invoking various QCD sum rules for the meson masses. The numerical results on the various radiative decays agree very well with the experimental data.
Hwang W.-Y. P.
Yang Ze-sen
Zhu Shi-Lin
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