Spin-1 particle in the light-front approach
AUTOR(ES)
Melo, J. P. B. C. de, Frederico, T.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2004-09
RESUMO
The electromagnetic current of spin-1 composite particles does not transform properly under rotations if only the valence contribution is considered in the light-front model. In particular, the plus component of the current, evaluated only for the valence component of the wave function, in the Drell-Yan frame violates rotational symmetry, which does not allow a unique calculation of the electromagnetic form-factors. The prescription suggested by Grach and Kondratyuk [Sov. J. Nucl. Phys. 38, 198 (1984)] to extract the form factors from the plus component of the current, eliminates contributions from pair diagrams or zero modes, which if not evaluated properly cause the violation of the rotational symmetry. We address this problem in an analytical and covariant model of a spin-1 composite particle.
Documentos Relacionados
- Gauge theories on the light-front
- Frame dependence of the pair contribution to the pion electromagnetic form factor in a light-front approach
- Nucleon magnetic moments in light-front models with quark mass asymmetries
- Ground state masses and binding energies of the nucleon, hyperon and heavy baryons in a light-front model
- Monte Carlo study of the spin-1 Baxter-Wu model