Pion and kaon elastic form factors in a refined light-front model
Abstract
Within the framework of light-front field theory, we reassess the electromagnetic form factors of the pion and kaon. Comparison with experiment is made for the full range of momentum transfer, q^2<0, including recent data. The light-front model's single regulator mass, m_R, of the \bar qq bound-state vertex function is initially adjusted to reproduce the weak decay constants, f_\pi\ and f_K, and both meson's charge radii, r_\pi\ and r_K. We study the behavior of these observables under variation of the quark masses and find an optimized parameter set, m_u=m_d, m_s and m_R, for which they are in sensibly better agreement with experiment than in a previous analysis; a feature also observed for the elastic form factors, in particular at small q^2. This model refinement is important in view of an extension to vector and heavy-light mesons.
Cite
@article{arxiv.1206.4721,
title = {Pion and kaon elastic form factors in a refined light-front model},
author = {Edson O. da Silva and J. P. B. C. de Melo and Bruno El-Bennich and Victo S. Filho},
journal= {arXiv preprint arXiv:1206.4721},
year = {2013}
}
Comments
5 pages, 8 figures; minor corrections, version published in PRC C86, 038202 (2012)