Partial Wave Analysis of K+N Scattering and the Possibility of Pentaquark Θ+(1540)

• Published in: Few-body systems Vol. 62; no. 3
• Main Authors: Kong, Kook-Jin, Yu, Byung-Geel
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.09.2021; Springer Nature B.V
• Subjects: Advances on the Few-Body Problem in Physics - Selected and Refereed papers from the 8th Asia-Pacific Conference; Atomic; Charge exchange; Cross-sections; Elastic scattering; Experiments; Hadrons; Heavy Ions; Molecular; Nuclear Physics; Optical and Plasma Physics; P waves; Particle and Nuclear Physics; Physics; Physics and Astronomy
• ISSN: 0177-7963; 1432-5411
• DOI: 10.1007/s00601-021-01659-4

Elastic K + n → K + n and charge exchange K + n → K 0 p reactions at low momenta are investigated using the partial wave analysis. Isospin relation gives constrains for the partial s - and p -waves among elastic K + p , K + n and charge exchange K + n → K 0 p amplitudes. Two sets of the phase shift for these partial waves in the isoscalar channel are obtained from the fit of experimental data on total and differential cross sections. Polarization observable leads to a good criterion to decide which set is valid. Differential cross section data near P Lab = 434 MeV/ c suggests a possibility of a resonance, e.g., the exotic Θ + ( 1540 ) baryon around s ≃ 1.54GeV.