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Coupled-channel analysis of {omega}-meson production in {pi}N and {gamma}N reactions for c.m. energies up to 2 GeV

Journal Article · · Physical Review. C, Nuclear Physics
; ; ;  [1]
  1. Institut fuer Theoretische Physik, Universitaet Giessen, D-35392 Giessen (Germany)
The pion- and photon-induced reactions for the final states {gamma}N,{pi}N,2{pi}N,{eta}N, and {omega}N are studied within a coupled-channel effective Lagrangian approach in the energy region from the pion threshold up to 2 GeV. To investigate the role of the nucleon resonances in the different reactions we include all known states with spin -1/2, -3/2, and -5/2 and masses below 2 GeV. We find a strong contribution from the D{sub 15}(1675) resonance to the {pi}N{yields}{omega}N reaction. While the F{sub 15}(1680) state only slightly influences the {omega} meson production in the {pi}N scattering its role is enhanced in the {omega} photoproduction due to the large electromagnetic coupling of this resonance. We predict the beam asymmetry {sigma}{sub X} to be a negative in the {gamma}p{yields}{omega}p reaction near to the threshold. Above the 1.85 GeV the asymmetry is found to change its sign and becomes positive at forward directions. The presented findings can be experimentally tested at GRAAL, CLAS, and CB-ELSA facilities.
OSTI ID:
20698699
Journal Information:
Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
Country of Publication:
United States
Language:
English

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