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_π and f_K, and both meson's charge radii, r_π 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.

5 pages, 8 figures; minor corrections, version published in PRC C86, 038202 (2012)

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• Unambiguous Extraction of the Electromagnetic Form Factors for Spin-1 Particles on the Light-Front
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• Electroweak properties of kaons in a nuclear medium
• Kaon Structure in the Nuclear Medium within the Light Front Approach
• In-Medium $K^{+}$ Electromagnetic Form Factor with a Symmetric Vertex in a Light Front Approach
• Contemporary continuum QCD approaches to excited hadrons
• The Charm and Beauty of Strong Interactions
• K0 and K+ meson electromagnetic form factors: a nonperturbative relativistic quark model versus experimental, perturbative and lattice Quantum-Chromodynamics results
• Pseudoscalar current and covariance with the light-front approach
• In-Medium Pion Valence Distribution Amplitude
• Electromagnetic spin-1 form-factor free of zero-modes
• The pion electromagnetic structure with self-energy
• Covariant form factors for spin-1 particles