K0 and K+ meson electromagnetic form factors: a nonperturbative relativistic quark model versus experimental, perturbative and lattice Quantum-Chromodynamics results
arXiv:2103.11877 · doi:10.1103/PhysRevD.104.034015
Abstract
It has been previously shown that a particular nonperturbative constituent-quark model of hadrons describes experimental measurements of electromagnetic form factors of light charged mesons through a small number of common phenomenological parameters, matching at the same time the Quantum-Chromodynamics (QCD) asymptotics for the pi-meson form factor at large momentum transfer. Here we start with the determination of the K0 electromagnetic form factor in this approach. Precise measurement of the K0 charge radius makes it possible to constrain model parameters with high accuracy. Then, with all parameters fixed, we revisit the K+ form factor and find that it matches experimental measurements in the infrared, lattice results at moderate momentum transfer and the perturbative QCD asymptotics in the ultraviolet. In this way we obtain a narrow constraint on the K+ charge radius, <r_K+^2> = 0.403 +0.007 -0.006 fm^2, and extend the successful infrared-ultraviolet connection from pi to K mesons.
7 pages, 5 figures. V2: updated uncertainty in the quark anomalous magnetic moment; version accepted by Phys. Rev. D
References in corpus (7)
- Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor
- Insights into the Emergence of Mass from Studies of Pion and Kaon Structure
- Revealing the structure of light pseudoscalar mesons at the Electron-Ion Collider
- Pion and kaon elastic form factors in a refined light-front model
- Dressed Quark Mass Dependence of Pion and Kaon Form Factors
- Pion gravitational form factors in a relativistic theory of composite particles
- Constraining scenarios of the soft/hard transition for the pion electromagnetic form factor with expected data of 12-GeV Jefferson Lab experiments and of the Electron-Ion Collider