Nucleon gravitational form factors from instantons: forces between quark and gluon subsystems
نویسندگان
چکیده
منابع مشابه
Chiral structure of nucleon gravitational form factors
We study the low momentum behavior of nucleon gravitational form factors in the framework of the heavy baryon chiral perturbation theory. At zero recoil they determine the momentum and spin apportion between nucleon constituents. Our result provides an insight into the response of the nucleon's pion cloud to an external weak gravitational field and establishes a theoretical framework for extrap...
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We compute the two-loop corrections to the massless quark form factor γ∗ → qq̄ and gluon form factor H → gg to all orders in the dimensional regularisation parameter ǫ = (4− d)/2. The two-loop contributions to the form factors are reduced to linear combinations of master integrals, which are computed in a closed form, expressed as Γ-functions and generalised hypergeometric functions of unit argu...
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The gluon propagator is calculated in the instanton background in a form appropriate for extracting the momentum dependent gluon mass. In background-ξ-gauge we get for the mass 400MeV for small p independent of the gauge parameter ξ. E–Mail: [email protected]–muenchen.de
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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...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2018
ISSN: 1029-8479
DOI: 10.1007/jhep09(2018)156