TY - JOUR

T1 - Chiral dynamics and the low-energy kaon-nucleon interaction

AU - Kaiser, N.

AU - Siegel, P. B.

AU - Weise, W.

N1 - Funding Information:
The effective chiral Lagrangian including baryons, which corresponds to an expansion in increasing powers of derivatives of the meson fields and quark masses, has been successful in understanding many properties of the meson-baryon system at low energies \[1 \]. Since the pion mass is small, properties of the pion-nucleon system are well described close to threshold. Recently, the SU(3) chiral Lagrangian has also been applied to the K+N system \[2,3\]. In both the 7rN and K÷N cases, the low-energy (s-wave) interaction is relatively weak and the leading term of the Lagrangian (linear in the meson four-momentum q) is the main one. In this article we examine the KN system within the context of the effective chiral Lagrangian. In contrast to the rrN and * Work supported in part by BMBF and GSI. 1 On sabbatical leave from the California State Polytechnic University, Pomona, CA 91768, USA.

PY - 1995/11/20

Y1 - 1995/11/20

N2 - We examine the meson-baryon interaction in the strangeness S = -1 sector using an effective chiral Lagrangian. Potentials are derived from this Lagrangian and used in a coupled-channel calculation of the low-energy observables. The potentials are constructed such that in the Born approximation the s-wave scattering length is the same as that given by the effective chiral Lagrangian, up to order q2. A comparison is made with the available low-energy hadronic data of the coupled K-p, Σπ, Λπ system, which includes the Λ(1405) resonance, K-p elastic and inelastic scattering, and the threshold branching ratios of the K-p decay. Good fits to the experimental data and estimates of previously unknown Lagrangian parameters are obtained.

AB - We examine the meson-baryon interaction in the strangeness S = -1 sector using an effective chiral Lagrangian. Potentials are derived from this Lagrangian and used in a coupled-channel calculation of the low-energy observables. The potentials are constructed such that in the Born approximation the s-wave scattering length is the same as that given by the effective chiral Lagrangian, up to order q2. A comparison is made with the available low-energy hadronic data of the coupled K-p, Σπ, Λπ system, which includes the Λ(1405) resonance, K-p elastic and inelastic scattering, and the threshold branching ratios of the K-p decay. Good fits to the experimental data and estimates of previously unknown Lagrangian parameters are obtained.

UR - http://www.scopus.com/inward/record.url?scp=4243299171&partnerID=8YFLogxK

U2 - 10.1016/0375-9474(95)00362-5

DO - 10.1016/0375-9474(95)00362-5

M3 - Article

AN - SCOPUS:4243299171

SN - 0375-9474

VL - 594

SP - 325

EP - 345

JO - Nuclear Physics, Section A

JF - Nuclear Physics, Section A

IS - 3

ER -