5 research outputs found
Global superscaling analysis of quasielastic electron scattering with relativistic effective mass
We present a global analysis of the inclusive quasielastic electron
scattering data with a superscaling approach with relativistic effective mass.
The SuSAM* model exploits the approximation of factorization of the scaling
function out of the cross section under quasifree conditions. Our
approach is based on the relativistic mean field theory of nuclear matter where
a relativistic effective mass for the nucleon encodes the dynamics of nucleons
moving in presence of scalar and vector potentials. Both the scaling variable
and the single nucleon cross sections include the effective mass as a
parameter to be fitted to the data alongside the Fermi momentum . Several
methods to extract the scaling function and its uncertainty from the data are
proposed and compared. The model predictions for the quasielastic cross section
and the theoretical error bands are presented and discussed for nuclei along
the periodic table from to : H, H, He, He,
C, Li, Be, Mg, Ni,
Y, Sn, Ta, W, Au, O, Al,
Ca, Ca, Fe, Pb, and U.
We find that more than 9000 of the total data fall within the
quasielastic theoretical bands. Predictions for Ti and Ar are
also provided for the kinematics of interest to neutrino experiments.Comment: 26 pages, 20 figures and 4 table
Semi-inclusive two-nucleon emission in (anti) neutrino CC scattering within the relativistic mean field framework
This paper delves into the distribution of semi-inclusive events involving
the emission of two nucleons in (anti) neutrino charged-current scattering. The
analysis is conducted within the framework of relativistic mean field theory
applied to nuclear matter. To quantify the likelihood of such semi-inclusive
events occurring, we employ a relativistic model of meson-exchange currents
that aligns with the 2p2h inclusive cross-section. The outcomes are presented
in terms of one-fold and two-fold integrated semi-inclusive cross sections. To
highlight disparities among the various emission channels, including
proton-proton, neutron-proton, and neutron-neutron, we compare them against a
purely phase-space isotropic distribution within the center of mass of the two
nucleons. These comparisons reveal significant differences in the event
distributions, shedding light on the distinctive characteristics of each
channel.Comment: 27 pages, 13 figure
Semiempirical formula for two-nucleon emission induced by short-range correlations in electron and neutrino scattering
A semiempirical formula is proposed for the emission cross section of two
correlated nucleons. We assume that the two-particle emission response is
proportional to the two-particle two-hole phase space multiplied by an averaged
single-nucleon response. The effect of the short-range correlations is encoded
in a correlation coefficient that is linked to an average of the high-momentum
distribution of a nucleon pair. The correlation coefficient depends only on the
momentum transfer and is obtained from a fit to the tail of the
phenomenological scaling function. We present predictions for the inclusive
two-nucleon emission cross section induced by electrons and neutrinos including
short-range correlations and meson-exchange currents.Comment: 14 pages, 8 figures. Major revision, with 5 more pages, a new
section, an appendix and a figur