5 papers
Axial exchange currents and the spin content of the nucleon
D. Barquilla-Cano, A. J. Buchmann, E. Hernandez
In a chiral quark model where chiral symmetry is introduced via a non-linear sigma model, we evaluate the axial couplings g_A(0), g_A^8(0) and g_A^0(0 )related to the spin structur…
Size and shape of baryons in a large N_c quark model
A. J. Buchmann
Baryon charge radii and quadrupole moments are calculated in a quark model generalized to an arbitrary number (N_c) of colors. Several relations among the charge radii and quadrupo…
Neutron charge form factor and quadrupole deformation of the nucleon
A. J. Buchmann
A quark model relation between the neutron charge form factor and the N->Delta charge quadrupole form factor is used to predict the C2/M1 ratio in the N->Delta transition from the…
Relations between N and Delta electromagnetic form factors
A. J. Buchmann
The inclusion of two-body exchange currents in the constituent quark model leads to several new relations between the electromagnetic form factors of the nucleon and Delta(1232). T…
N->Delta Quadrupole Transition in the Constituent Quark Model
A. J. Buchmann
Information on the intrinsic deformation of the proton can be obtained by studying the electromagnetic p-->Delta+ quadrupole transition. Recent experiments have shown that the elec…