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

Author(s)

da Silva, Edson O. ^[1] ; de Melo, J. P. B. C. ^[1] ; El-Bennich, Bruno ^[1] ; Filho, Victo S. ^[1]

Affiliation

^[1] Univ Cruzeiro Sul, LFTC, BR-01506000 Sao Paulo - Brazil

• Document type: Journal article
• Source: Physical Review C; v. 86, n. 3 SEP 17 2012.
• Web of Science Citations: 25

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 <(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. (AU)

• FAPESP's process: 09/51296-1 - Hadronic effects in heavy-quark physics
• Grantee: Bruno Omar El Bennich
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 10/05772-3 - Hadronic effects in heavy-quark physics
• Grantee: Bruno Omar El Bennich
• Support Opportunities: Scholarships in Brazil - Young Researchers