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Zero-Mode Contribution in Nucleon-Delta Transition | | Jianghao Yu
; Teng Wang
; Chueng-Ryong Ji
; Bo-Qiang Ma
; | | Date: |
1 Aug 2007 | | Abstract: | 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 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
($epsilon^+_{h=pm}=0$) with circular polarization in Drell-Yan-West frame, we
find that only the helicity components $({1over 2}, {1over 2})$ and $({1over
2},-{1over 2})$ 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 wavefunctions. The angular condition, which
guarantees the full covariance of different schemes, is recovered. | | Source: | arXiv, 0708.0172 | | Services: | Forum | Review | PDF | Favorites | |
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