Associated photoproduction of K{sup +} mesons off protons within a coupled-channels K-matrix approach

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.015204· OSTI ID:21388861

Shyam, R ^[1]; Scholten, O ^[2]; Lenske, H ^[1]

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1. Institute fuer Theoretische Physik, Universitaet Giessen, D-35392 Giessen (Germany)
2. Kernfysisch Versneller Instituut, University of Groningen, NL-9747 AA Groningen (Netherlands)

We investigate the p(gamma,K{sup +})LAMBDA and p(gamma,K{sup +})SIGMA{sup 0} reactions within a coupled-channels effective-Lagrangian method that is based on the K-matrix approach. The two-body final channels included are piN, etaN, phiN, rhoN, gammaN, KLAMBDA, and KSIGMA. Nonresonant meson-baryon interactions are included in the model via nucleon intermediate states in the s and u channels and meson exchanges in the t-channel amplitude and the u-channel resonances. The nucleon resonances S{sub 11}(1535), S{sub 11}(1650), S{sub 31}(1620), P{sub 11}(1440), P{sub 11}(1710), P{sub 13}(1720), P{sub 33}(1232), P{sub 33}(1600), D{sub 13}(1520), D{sub 13}(1700), and D{sub 33}(1700) are included explicitly in the calculations. With a single parameter set that was derived earlier from our analysis of eta-meson photoproduction, the model describes all the available cross-section and polarization data of the SAPHIR Collaboration well for the two investigated channels. The description of the data from the CLAS Collaboration, however, is not of the same quality. In contrast to some previous studies, we do not find any compelling need to include a D{sub 13} state with a mass of about 2.0 GeV to reproduce the data for the p(gamma,K{sup +})LAMBDA reaction at photon energies corresponding to the invariant mass around 1.9 GeV.

• OSTI ID: 21388861
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevC.81.015204; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSON-EXCHANGE MODELS
CHARGED-PARTICLE REACTIONS
COUPLED CHANNEL THEORY
CROSS SECTIONS
ETA MESONS
GAMMA RADIATION
GEV RANGE 01-10
INTERMEDIATE STATE
K MATRIX
KAONS PLUS
LAGRANGIAN FUNCTION
LAMBDA PARTICLES
MASS
MESON-BARYON INTERACTIONS
PHOTONS
PHOTOPRODUCTION
POLARIZATION
PROTONS
RESONANCE
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
T CHANNEL
TWO-BODY PROBLEM
U CHANNEL
BARYONS
BASIC INTERACTIONS
BOSONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FUNCTIONS
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
IONIZING RADIATIONS
KAONS
LAMBDA BARYONS
MANY-BODY PROBLEM
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATRICES
MESONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PERIPHERAL MODELS
PSEUDOSCALAR MESONS
RADIATIONS
SIGMA BARYONS
STRANGE MESONS
STRANGE PARTICLES