224 citations · 1.7k across the 62 of their papers we have counts for
4 papers · 1 filter
Extracting the Omega- electric quadrupole moment from lattice QCD data
G. Ramalho, M. T. Pena
The Omega- has an extremely long lifetime, and is the most stable of the baryons with spin 3/2. Therefore the Omega- magnetic moment is very accurately known. Nevertheless, its ele…
Valence quark contributions for the gamma N -> P11(1440) transition
G. Ramalho, K. Tsushima
A covariant spectator quark model is applied to estimate the valence quark contributions to the$ F1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction.…
A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition
G. Ramalho, K. Tsushima
A covariant spectator constituent quark model is applied to study the gamma N -> Delta(1600) transition. Two processes are important in the transition: a photon couples to the indi…
Electromagnetic form factors of the Delta with D-waves
G. Ramalho, M. T. Pena, Franz Gross
The electromagnetic form factors of the Delta baryon are evaluated within the framework of a covariant spectator quark model, where S and D-states are included in the wave func…