The Role of Lambda(1405) in Kaon-Proton Interactions
arXiv:hep-ph/9505283 · doi:10.1016/0375-9474(96)00086-3
Abstract
S-wave $K^-p$ scattering into various channels near threshold are analyzed in heavy-baryon chiral perturbation theory with $Î(1405)$ introduced as an independent field. This is the approach that predicted the critical density $2<=Ï_c/Ï_0 <=3$ for negatively charged kaon condensation. We show that chiral perturbation expansion treating the $Î(1405)$ as elementary is consistent with {\it all} threshold data including a double-charge-exchange process suppressed at leading order of chiral expansion in the absence of the $Î(1405)$. We also discuss S-wave $K^+ p$ scattering phase shifts at low energy.
12 pages, epsfig.sty, 1 figure (uuencoded)