Non-perturbative chiral approach to Kp --gamma Y reactions(9)

A recently developed nonperturbative chiral approach to describe the S=-1 meson-baryon reactions has been extended to investigate the near threshold $K^- p \to \gamma \Lambda, \gamma \Sigma^0$ reactions. With the parameters governed by chiral SU(3) symmetr

wherekMBistheon-shellmomentumforthechannelMB.ThethirdterminEq.(19)isduetothesecondpoleofmeson-exchangetermFig.2c.Ithasthefollowingform

γY,K p(q,k)=i′

MB {( d kEB(k)[1√

CY,MB]eM 2[ k· ][ σ·( k q)]2f

2fCY,MB][1 ωM(k)(k)+k

4qklnωM