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N-Delta axial transition form factors
B. Golli, L. Amoreira, M. Fiolhais +1
We review some basic properties of the N-Delta transition axial amplitudes and relate them to the strong pi-N-Delta form-factor. In models with the pion cloud we derive a set of co…
Axial currents in electro-weak pion production at threshold and in the Delta-region
S. Sirca, L. Amoreira, M. Fiolhais +1
We discuss electro-magnetic and weak production of pions on nucleons and show how results of experiments and their interpretation in terms of chiral quark models with explicit meso…
Axial Excitation of the Delta in Chiral Quark Models
S. Sirca, L. Amoreira, M. Fiolhais +1
We discuss electro-magnetic and weak axial N-Delta transition amplitudes in the linear sigma-model and the Cloudy-Bag Model as typical representatives of chiral quark models. We sh…
Axial amplitudes for Delta excitation in chiral quark models
B. Golli, S. Sirca, L. Amoreira +1
We study the axial amplitudes for the N-Delta transition in models with quarks and chiral mesons. A set of constraints on the pion field is imposed which enforces PCAC and the off-…
Excitation of non-quark degrees of freedom in N*
B. Golli, P. Alberto, M. Fiolhais
We study the contribution of glueball and sigma-meson degrees of freedom to nucleon excited states in the framework of a chiral version of the chromodielectric model. We have found…
E2 and C2 amplitudes for electroproduction of
M. Fiolhais, B. Golli, S. Sirca
We compute the amplitudes for the electromagnetic transition in the framework of soliton models with quarks and mesons. The ratios E2/M1 and C2/M1 as functions of the…