The Δ excitation in the nuclear-charge longitudinal response

Abstract

The presence of a resonant structure corresponding to the ∆ excitation in the longitudinal response to an e.m. probe is investigated. It is shown that many-body effects could significantly increase the relativistic contribution suggested by M.Ericson and coworkers

The role of the Δ(1232) on the longitudinal response in the inclusive electron scattering reaction

“…Moreover, the interaction utilized in Refs. [28] and [30] is different than ours (in fact, each work employs a different one). This point is particularly…”

“…[28] and [30] is the way in which we deal with the Pauli exchange terms. In several works (see for instance Refs.…”

“…The ∆ is also incorporated in the longitudinal response in the works of Cenni et al. [29] and Amore et al [30] where the Boson Loop Expansion is employed. In Amaro et al [18] (and also in Ref.…”

Static properties of nuclear matter within the Boson Loop Expansion

“…(18)- (22) supplies the static properties of nuclear matter, an approximation scheme is required. As in Refs.…”

“…The so-called Boson Loop Expansion (BLE), which we shall consider in the present paper, has been proposed as a suitable tool to formulate consistent approximation schemes for non-perturbative calculations in different issues of nuclear physics [17][18][19][20][21][22][23]. The underlying idea, as in MLE, amounts to integrate out the nucleonic degrees of freedom within a path-integral formulation for the dynamics of interacting nucleons and mesons.…”