$KN \Lambda$ and $KN \Sigma$ coupling constants from the Chiral Bag Model

M.T. Jeong; Il-T. Cheon

doi:doi:10.1007/s100500050244

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$KN \Lambda$ and $KN \Sigma$ coupling constants from the Chiral Bag Model

M.T. Jeong¹ - Il-T. Cheon²

¹ Department of Physics, Dongshin University, Naju 520-714, Korea (e-mail: mjeong@dongshinu.ac.kr)
² Department of Physics, Yonsei University, Seoul 120-749, Korea (e-mail: itcheon@phya.yonsei.ac.kr)

Received: 17 August 1998 / Revised version: 22 December 1998 Communicated by F. Lenz

Abstract
The $KN \Lambda$ and $KN \Sigma$ coupling constants have been calculated in the framework of the Chiral Bag Model(CBM). We find $-3.88 \leq g_{_{KN \Lambda}} \leq -3.67$ and $1.15 \leq g_{_{KN \Sigma}} \leq 1.24$ by taking into account pseudoscalar mesons $(\pi, K)$ and vector mesons $(\rho, \omega, K^{\ast})$ field effects. Particularly, it is shown that vector mesons make significant contributions to the coupling constants $g_{_{KN \Lambda}}$ and $g_{_{KN \Sigma}}$ . Our values are existing within the experimental limits compared to the phenomenological values extracted from the kaon photoproduction and kaon-nucleon scattering experiments. Also, form factors are suggested for the $\pi NN$ , $\pi N \Delta$ , $KN \Lambda$ and $KN \Sigma$ couplings.

PACS
13.75.Jz Kaon-baryon interactions - 14.40.Aq $\pi$ , k, and $\eta$ mesons

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$KN \Lambda$ and $KN \Sigma$ coupling constants from the Chiral Bag Model