منابع مشابه
2 00 1 Photoproduction of η and η ′ mesons off nucleons close to threshold 1
The importance of Born terms and resonance exchange for η and η ′ photoproduction off both the proton and neutron within U (3) baryon chi-ral perturbation theory is investigated. Low-lying resonances such as the vector mesons and J P = 1/2 + , 1/2 − baryon resonances are included explicitly and their contributions together with the Born terms are calculated. The coupling constants of the resona...
متن کاملGauge-invariant Meson Photoproduction with Extended Nucleons
The general gauge-invariant photoproduction formalism given by Haberzettl is applied to kaon photoproduction off the nucleon at the tree level, with form factors describing composite nucleons. Numerical results show that this gauge-invariance procedure, when compared to Ohta’s, leads to a much improved description of experimental data. Predictions for the new Bonn SAPHIR data for p(γ,K)Λ are gi...
متن کاملThreshold pion photoproduction of nucleons in the chiral quark model.
In this paper, we show that the low energy theorem (LET) of the threshold pion-photoproduction can be fully recovered in the quark model. An essential result of this investigation is that the quark-pion operators are obtained from the e ective chiral Lagrangian, and the low energy theorem does not require the constraints on the internal structures of the nucleon. The pseudoscalar quark-pion cou...
متن کاملScattering of vector mesons off nucleons
We construct a relativistic and unitary approach to ’high’ energy pionand photonnucleon reactions taking the πN, π∆, ρN , ωN , ηN,KΛ,KΣ final states into account. Our scheme dynamically generates the sand d-wave nucleon resonances N(1535), N(1650) and N(1520) and isobar resonances ∆(1620) and ∆(1700) in terms of quasi-local interaction vertices. The description of photon-induced processes is ba...
متن کاملParticle production from off-shell nucleons
Particle production in equilibrium and nonequilibrium quantum systems is calculated. The effects of the off-shell propagation of nucleons in medium on the particle production are discussed. Comparision to the semiclassical production rate is given. The production of mesons and hard photons in intermediate energy heavy ion collisions is considered to be sensitive to the collision dynamics and to...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2006
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.74.035205