Pion charge form factor and constraints from space-time translations

Details Pion charge form factor and constraints from space-time translations Pion charge form factor and constraints from space-time translations

2010-02-18

arxiv.org/abs/1002.3546v1

5th International Conference on Quarks and Nuclear Physics (QNP09), Beijing : Chine (2009)

Physics

Nuclear Physics

Nuclear Theory

6 pages, 2 figures, proceedings of the QNP2009 international conference (Beijing, oct. 2009), to be published in Chinese Physi

Scientific paper

The role of Poincar\'e 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.

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