Zero-mode contribution in nucleon-delta transition
Journal Article
·
· Physical Review. D, Particles Fields
- Department of Physics, Peking University, Beijing 100871 (China)
We investigate the transition form factors between nucleon and {delta}(1232) particles by using a covariant quark-spectator-diquark field theory model in (3+1) dimensions. Performing a light-front calculation in parallel with the manifestly covariant calculation in the light-front helicity basis, we examine the light-front zero-mode contribution to the helicity components of light-front good ('+') current matrix elements. Choosing the light-front gauge ({epsilon}{sub h={+-}}{sup +}=0) with circular polarization in the Drell-Yan-West frame, we find that only the helicity components ((1/2),(1/2)) and ((1/2),-(1/2)) of the good current receive the zero-mode contribution. Taking into account the zero mode, we find the prescription independence in obtaining the light-front solution of form factors from any three helicity matrix elements with smeared light-front wave functions. The angular condition, which guarantees the full covariance of different schemes, is recovered.
- OSTI ID:
- 21032336
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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