K-matrix fits to. pi. N. -->. N. pi. and. pi. N. -->. N. pi pi. in the resonance region. sqrt. s = 1. 3 to 2. 0 GeV

Journal Article · Fri Mar 31 23:00:00 EST 1978 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.17.1795· OSTI ID:7085409

Longacre, R S; Lasinski, T; Rosenfeld, A H; Smadja, G; Cashmore, R J; Leith, D W.G.S.

Starting with partial-wave amplitudes for ..pi..N ..-->.. N..pi.. and ..pi..N ..-->.. several isobar-model states of N..pi pi.., we are able to apply the constraint of unitarity (using the K matrix). This permits the removal of the overall phase ambiguity of the isobar amplitudes at each energy. The K-matrix fits generate a smooth prescription for the T-matrix amplitudes, enabling us to search the complex energy plane for poles. The uniqueness of these poles is demonstrated by doing Breit-Wigner refits to the fitted T-matrix amplitudes. The success of the refits and the obvious interpretation justifies a simple determination of coupling signs for which there can be checks with theory.

• Research Organization: Department of Physics and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• OSTI ID: 7085409
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 17:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645206* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. = 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BREIT-WIGNER FORMULA
ENERGY RANGE
GEV RANGE
GEV RANGE 01-10
HADRON-HADRON INTERACTIONS
INTERACTIONS
ISOBAR MODEL
K MATRIX
MATHEMATICAL MODELS
MATRICES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PION-NUCLEON INTERACTIONS
QUANTUM NUMBERS
RESONANCE
S MATRIX
SCATTERING AMPLITUDES
UNITARITY