The Role of Λ(1405) in Kaon-Proton Interactions
نویسنده
چکیده
S-wave Kp scattering into various channels near threshold are analyzed in heavybaryon chiral perturbation theory with Λ(1405) introduced as an independent field. This is the approach that predicted the critical density 2 <∼ ρc/ρ0 <∼ 3 for negatively charged kaon condensation. We show that chiral perturbation expansion treating the Λ(1405) as elementary is consistent with all threshold data including a double-chargeexchange process suppressed at leading order of chiral expansion in the absence of the Λ(1405). We also discuss S-wave Kp scattering phase shifts at low energy.
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