2p2h effects on the weak pion production cross section

TL;DR

This paper analyzes the impact of two-particle-two-hole (2p2h) effects on the weak pion production cross section in neutrino-nucleon interactions, crucial for accurate neutrino energy reconstruction and background subtraction in experiments.

Contribution

It provides a detailed analysis of nuclear effects, including 2p2h contributions, on the CC1-pion channel, enhancing the accuracy of neutrino interaction modeling.

Findings

Quantifies the influence of 2p2h effects on the pion production cross section.

Highlights the importance of nuclear effects in neutrino energy reconstruction.

Provides a framework extendable to neutral current interactions.

Abstract

The neutrino-nucleon --> lepton pion QE reaction on the A-target is used as a signal event or/and to reconstruct the neutrino energy, using two-body kinematics. Competition of another processes could lead to misidentification of the arriving neutrinos, being important the fake events coming from the CC1-pion background. A precise knowledge of cross sections is a prerequisite in order to make simulations in event generators to substract the fake ones from the QE countings, and in this contribution we analyze the different nuclear effects on the CC1-pion channel. Our calculations also can be extended for the NC case.