2p-2h excitations in neutrino scattering: angular distribution and frozen approximation

TL;DR

This paper investigates 2p-2h excitations in neutrino scattering within the relativistic Fermi gas model, analyzing phase-space and angular distributions to optimize calculations and compare relativistic and non-relativistic approaches.

Contribution

It provides a detailed mathematical analysis of angular distributions, introduces an analytical integration method for divergences, and evaluates the frozen approximation's accuracy in neutrino scattering models.

Findings

Frozen approximation reproduces response functions well

Analytical method handles divergences in angular distributions

Phase-space analysis improves computational efficiency

Abstract

We study the phase-space dependence of 2p-2h excitations in neutrino scattering using the relativistic Fermi gas model. We follow a similar approach to other authors, but focusing in the phase-space properties, comparing with the non-relativistic model. A careful mathematical analysis of the angular distribution function for the outgoing nucleons is performed. Our goals are to optimize the CPU time of the 7D integral to compute the hadron tensor in neutrino scattering, and to conciliate the different relativistic and non relativistic models by describing general properties independently of the two-body current. For some emission angles the angular distribution becomes infinite in the Lab system, and we derive a method to integrate analytically around the divergence. Our results show that the frozen approximation, obtained by neglecting the momenta of the two initial nucleons inside the integral of the hadron tensor, reproduces fairly the exact response functions for constant current matrix elements.