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

Shi-Lin Zhu

doi:doi:10.1007/s100500050230

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2023 Impact factor 2.6

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.