Non-perturbative chiral approach to Kp --gamma Y reactions(18)

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

TABLES

TABLEI.SU(3)couplingconstantsde nedinEq.(17)

MB=

B′=Λ

B′=Σ0

ZB′MB

131313 23K p√π+Σ √π Σ+√K+Ξ √

1 110

parisionsofthepredictedK p→γΛ,γΣ0branchingratiosde nedinEq.(24)(inunitof10 3)withthedata[20].Theamplitudesarede nedinEqs.(19)-(22).

AmplitudeBK p→γΛBK p→γΣ0R=BK p→γΛ/BK p→γΣ0K p

π+Σ

π Σ+

K+Ξ 0.5880.431-0.4310.157-0.1590.4300.4300.589-0.68+i1.63-0.66-i1.01-0.61-i0.40-0.087-i0.002

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

TABLEIV.Branchingratios(inunitof10 3)predictedfromthecalculationswithdi erentnumbersofcoupled-channelsincluded.Herewede neRatio=BK p→γΛ/BK p→γΣ0

Channelsincluded

0K pK p+π+Σ K p+π+Σ +π Σ+K p+π+Σ +π Σ++K+Σ Q+QGT

Q+QGT+

[Q+QGT+ ]no η

[Q+QGT+ ]with Λπ

Data[25]1.311.582.471.10(1.22)0.86±0.160.951.331.271.05(1.13)1.44±0.311.381.191.941.04(1.08)0.4 0.9