Pion charge form factor and constraints from space-time translations
Abstract
The role of Poincaré covariant space-time translations is investigated in the case of a relativistic quantum mechanics approach to the pion charge form factor. It is shown that the related constraints are generally inconsistent with the assumption of a single-particle current, which is most often referred to. The only exception is the front-form approach with q+ = 0. How accounting for the related constraints, as well as restoring the equivalence of different RQM approaches in estimating form factors, is discussed. Some extensions of this work and, in particular, the relationship with a dispersion-relation approach, are presented. Conclusions relative to the underlying dynamics are given.
- Publication:
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Chinese Physics C
- Pub Date:
- September 2010
- DOI:
- 10.1088/1674-1137/34/9/038
- arXiv:
- arXiv:1002.3546
- Bibcode:
- 2010ChPhC..34.1342D
- Keywords:
-
- Nuclear Theory;
- High Energy Physics - Phenomenology
- E-Print:
- 6 pages, 2 figures, proceedings of the QNP2009 international conference (Beijing, oct. 2009), to be published in Chinese Physics C