Meson-exchange currents and superscaling analysis with relativistic effective mass of quasielastic electron scattering from $^{12}$C

TL;DR

This paper reanalyzes quasielastic electron scattering data from carbon-12 using a superscaling approach with relativistic effective mass, incorporating meson-exchange currents and subtracting two-particle emission effects to improve the accuracy of the cross section modeling.

Contribution

It introduces the SuSAM* model that accounts for relativistic effective mass and meson-exchange currents, providing a refined method to analyze quasielastic scattering data.

Findings

The new scaling function accurately describes the quasielastic data.

The model isolates the genuine quasielastic response from 2p-2h contributions.

The approach enables separate calculation of 2p-2h effects to combine with the quasielastic response.

Abstract

We reanalyze the scaling properties of inclusive quasielastic electron scattering from $^{12}$C by subtracting from the data the effects of two-particle emission. A model of relativistic meson-exchange currents (MEC) is employed within the mean field theory of nuclear matter, with scalar and vector potentials that induce an effective mass and a vector energy to the nucleons. A new phenomenological quasielastic scaling function is extracted from a selection of the data after the subtraction of the 2p-2h contribution. The resulting superscaling approach with relativistic effective mass (SuSAM*) can be used to compute the genuine quasielastic cross section without contamination of the 2p-2h channel that can then be added separately to obtain the total quasielastic plus two-nucleon emission response.