Electromagnetic structure of the nucleon in the perturbative chiral quark model

V. E. Lyubovitskij, Th Gutsche, Amand Faessler

Результат исследований: Материалы для журналаСтатья

57 Цитирования (Scopus)

Аннотация

We apply the perturbative chiral quark model (PCQM) at one loop to analyze the electromagnetic structure of nucleons. This model is based on an effective Lagrangian, where baryons are described by relativistic valence quarks and a perturbative cloud of Goldstone bosons. Including the electromagnetic interaction we first develop the formalism up to one loop in the Goldstone boson fluctuation relying on renormalization by use of counterterms. Local gauge invariance is satisfied both on the Lagrangian level and also for the relevant baryon matrix elements in the Breit frame. We apply the formalism to obtain analytical expressions for the nucleon charge and magnetic form factors, which are expressed in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucleon coupling, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core). A detailed numerical analysis of the nucleon magnetic moments, charge and magnetic radii, and also the momentum dependence of form factors is presented.

Язык оригиналаАнглийский
Страницы (с-по)652031-6520316
Число страниц5868286
ЖурналPhysical Review C - Nuclear Physics
Том64
Номер выпуска6
DOI
СостояниеОпубликовано - дек 2001
Опубликовано для внешнего пользованияДа

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

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