Electromagnetic N-Δ transition form factors in a covariant quark-diquark model
نویسندگان
چکیده
منابع مشابه
Nucleon Form Factors in a Covariant Diquark – Quark Model †
In a model where constituent quarks and diquarks interact through quark exchange the Bethe–Salpeter equation in ladder approximation for the nucleon is solved. Quark and diquark confinement is effectively parametrized by choosing appropriately modified propagators. The coupling to external currents is implemented via nontrivial vertex functions for quarks and diquarks to ensure gauge invariance...
متن کاملNucleon Form Factors in the Covariant Diquark–Quark Model
The nucleon is described as a bound state of a quark and an extended diquark. Hereby the notion “diquark” refers to the modelling of separable correlations in the two–quark Green’s functions. Binding of quarks and diquarks takes place via an exchange interaction and is therefore related to the Pauli principle for three– quark states. Fully Poincaré covariant nucleon amplitudes are calculated fo...
متن کاملForm Factors of Baryons in a Confining and Covariant Diquark-Quark Model
We treat baryons as bound states of scalar or axialvector diquarks and a constituent quark which interact through quark exchange. This description results as an approximation to the relativistic Faddeev equation for three quarks which yields an effective Bethe-Salpeter equation. Octet and decuplet masses and fully fourdimensional wave functions have been computed for two cases: assuming an esse...
متن کاملNucleons in the Covariant Quark–diquark Model
We introduce diquarks as separable correlations in the two–quark Green’s function to facilitate the description of baryons as relativistic three– quark bound states. These states then emerge as solutions of Bethe– Salpeter equations for quarks and diquarks that interact via quark exchange. Approximating quark and diquark propagators by the corresponding free ones, we calculate nucleon static pr...
متن کاملBaryons in a Covariant and Confining Diquark–Quark Model
In a covariant model where constituent quarks and diquarks interact through quark exchange, the Bethe-Salpeter equation in ladder approximation for octet and decuplet baryons is solved. Quark and diquark confinement is thereby effectively parametrised by choosing appropriately modified propagators. Numerical results for the baryon masses are presented. In a second step electromagnetic, weak and...
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ژورنال
عنوان ژورنال: Zeitschrift für Physik A Hadrons and Nuclei
سال: 1997
ISSN: 0939-7922,1431-5831
DOI: 10.1007/s002180050371