EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 4, 277-281

The $K^{\ast} K\pi$ and $\rho\pi\pi$ couplings in QCD

Shi-Lin Zhu

Institute of Theoretical Physics, Academia Sinica, P.O.BOX 2735, Beijing 100080, P.R.China

Received: 31 July 1998 / Revised version: 20 November 1998 Communicated by W. Weise

Abstract
The light cone QCD sum rules are derived for the $K^{\ast} K\pi$ coupling $g_{K^\ast K\pi} $ and the $\rho\pi\pi$ coupling $g_{\rho\pi\pi}$. The contribution from the excited states and the continuum is subtracted cleanly through the double Borel transform with respect to the two external momenta, p12, p22=(p-q)2. Our result $g_{K^\ast K\pi}=(8.7\pm 0.5)$ and $g_{\rho\pi\pi}=(11.5\pm 0.8)$ is in good agreement with the experimental value.

PACS
13.75.Lb Meson-meson interactions - 14.40.-n Mesons - 13.25.-k Hadronic decays of mesons - 12.38.Lg Nonperturbative methods

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