Pion and kaon elastic form factors in a refined light-front model

作者：da Silva Edson O^*; de Melo J P B C; El Bennich Bruno; Filho Victo S

来源：Physical Review C, 2012, 86(3): 038202.

DOI：10.1103/PhysRevC.86.038202

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 <(q)over bar>q bound-state vertex function is initially adjusted to reproduce the weak decay constants, f(pi) and f(K), and both mesons' 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.

• 出版日期2012-9-17