RQM description of PS meson form factors, constraints from space-time translations, and underlying dynamics

Details RQM description of PS meson form factors, constraints from space-time translations, and underlying dynamics RQM description of PS meson form factors, constraints from space-time translations, and underlying dynamics

2010-06-03

arxiv.org/abs/1006.0578v2

Eur.Phys.J.A47:13,2011

Physics

Nuclear Physics

Nuclear Theory

37 pages, 13 figures; figures completed for notations, revised text with better emphasis on differences with previous works; a

Scientific paper

10.1140/epja/i2011-11013-8

The role of Poincar\'e covariant space-time translations is investigated in the case of the pseudoscalar-meson charge form factors. It is shown that this role extends beyond the standard energy-momentum conservation, which is accounted for in all relativistic quantum mechanics calculations. It implies constraints that have been largely ignored until now but should be fulfilled to ensure the full Poincar\'e covariance. The violation of these constraints, which is more or less important depending on the form of relativistic quantum mechanics that is employed, points to the validity of using a single-particle current, which is generally assumed in calculations of form factors. In short, these constraints concern the relation of the momentum transferred to the constituents to the one transferred to the system. How to account for the related constraints, as well as restoring the equivalence of different relativistic quantum mechanics approaches in estimating form factors, is discussed. Some conclusions relative to the underlying dynamics are given in the pion case.

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