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One pion production in neutrino–nucleon scattering and the different parameterizations of the weak N→Δ vertex
(Elsevier, 2013-12)
The N→Δ weak vertex provides an important contribution to the one pion production in neutrino–nucleon and neutrino–nucleus scattering for πN invariant masses below 1.4 GeV. Beyond its interest as a tool in neutrino detection ...
Transition form factors: γ∗+p → Δ (1232), Δ (1600)
(2019-08-05)
Electroproduction form factors describing the γ∗p→Δ+(1232), Δ+(1600) transitions are computed using a fully dynamical diquark-quark approximation to the Poincaré-covariant three-body bound-state problem in relativistic ...
Different vertex parameterizations and propagators for the Δ contribution in π-photoproduction
(IOP Publishing, 2017-03)
We evaluate the total cross section for the π-photoproduction process and analyze the behavior of the Δ(1232) resonance contribution when the photon energy is increased from threshold up to 0.7 GeV. Within this energy range ...
Asymptotic Expansion of the Heteroclinic Bifurcation for the Planar Normal Form of the 1:2 Resonance
(2016-01-01)
We consider the family of planar differential systems depending on two real parameters x = y, y = δ1x + δ2y + x3 - x2y. This system corresponds to the normal form for the 1:2 resonance which exhibits a heteroclinic connection. ...
About the validity of complex mass scheme for the Δ resonance and higher energy region approaches
(IOP Publishing, 2015-09)
It is a well known fact that when a resonance (R) is produced and decays, its unperturbed propagator will be singular at p2 mR = 2 when it appears in an s-type Feynman pole graph. Nevertheless this is not a problem, since ...
Absorptive one-loop corrections and the complex-mass prescription for the Δ resonance propagator
(IOP Publishing, 2012-07)
It is shown that the absorptive one-loop self-energy corrections to the δ ++ propagator can reproduce the complex-mass prescription for its resonant form. The effects of absorptive corrections beyond the ones considered ...