Chiral dynamics in the {gamma}p{yields}{pi}{sup 0}{eta}p and {gamma}p{yields}{pi}{sup 0}K{sup 0}{sigma}{sup +} reactions

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.73.045209· OSTI ID:20771488

Doering, M; Oset, E ^[1]; Strottman, D ^[1]

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1. Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Aptd. 22085, E-46071 Valencia (Spain)

Using a chiral unitary approach for meson-baryon scattering in the strangeness zero sector, where the N{sup *}(1535)S{sub 11} resonance is dynamically generated, we study the reactions {gamma}p{yields}{pi}{sup 0}{eta}p and {gamma}p{yields}{pi}{sup 0}K{sup 0}{sigma}{sup +} at photon energies at which the final states are produced close to threshold. Among several reaction mechanisms, we find the most important is the excitation of the {delta}{sup *}(1700)D{sub 33} state, which subsequently decays into a pseudoscalar meson and a baryon belonging to the {delta}(1232)P{sub 33} decuplet. Hence, the reaction provides useful information with which to test current theories of the dynamical generation of the low-lying 3/2{sup -} states. The first reaction is shown to lead to sizable cross sections and the N{sup *}(1535)S{sub 11} resonance shape is seen clearly in the {eta}p invariant mass distribution. The same dynamical model is shown to lead to much smaller cross sections at low energies in the second reaction. Predictions are made for cross sections and invariant mass distributions that can be compared with ongoing experiments at ELSA.

• OSTI ID: 20771488
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 73; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRALITY
DELTA-1232 BARYONS
DELTA-1700 BARYONS
ETA MESONS
KAONS NEUTRAL
MASS DISTRIBUTION
MESON-BARYON INTERACTIONS
N-1535 BARYONS
PHOTON-PROTON INTERACTIONS
PIONS NEUTRAL
SIGMA BARYONS