The Role of Lambda(1405) in Kaon-Proton Interactions

Abstract

S-wave $K^{-}p$ scattering into various channels near threshold are analyzed in heavy-baryon chiral perturbation theory with $\Lambda (1405)$ introduced as an independent field. This is the approach that predicted the critical density $2<={\rho }_c/{\rho }_0<=3$ for negatively charged kaon condensation. We show that chiral perturbation expansion treating the $\Lambda (1405)$ 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 $\Lambda (1405)$. We also discuss S-wave $K^{+}p$ scattering phase shifts at low energy.

12 pages, epsfig.sty, 1 figure (uuencoded)

References in corpus (5)

• Chiral Dynamics and the Low Energy Kaon-Nucleon Interaction
• An Effective Chiral Lagrangian Approach to Kaon-Nuclear Interactions: Kaonic atom and kaon condensation
• Pion-Nucleon Sigma Term in Lattice QCD
• Kaon Condensation in ``Nuclear Star" Matter
• $\Lambda (1405)$ Contribution to Kaon-Nucleon Scattering Lengths In Chiral Perturbation Theory

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