K0 and K+ -meson electromagnetic form factors: A nonperturbative relativistic quark model versus experimental, perturbative, and lattice quantum-chromodynamics resultsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 29 сентября 2021 г.
Аннотация:It has been previously shown that a particular nonperturbative constituent-quark model of hadronsdescribes experimental measurements of electromagnetic form factors of light charged mesons through asmall number of common phenomenological parameters, matching at the same time the quantum-chromodynamics (QCD) asymptotics for the π-meson form factor at large momentum transfer. Here westart with the determination of the K0 electromagnetic form factor in this approach. Precise measurement ofthe K0 charge radius makes it possible to constrain model parameters with high accuracy. Then, with allparameters fixed, we revisit the Kþ form factor and find that it matches experimental measurements in theinfrared, lattice results at moderate momentum transfer, and the perturbative QCD asymptotics in theultraviolet. In this way we obtain a narrow constraint on the Kþ charge radius, hr2Kþi ¼ 0.403þ0.007−0.006 fm2,and extend the successful infrared-ultraviolet connection from πto Kmesons.