Neutrino-nucleon cross-section model tuning in GENIE v3

Júlia Tena-Vidal,Vadim A Naumov,Steve Dennis,Konstantin S Kuzmin,A Meregaglia ,L Jiang ,V S Syrotenko ,C Andreopoulos ,O Hen ,S A Dytman ,R Hatcher ,C Barry ,Walter T Giele ,G N Perdue ,A Papadopoulou ,J Wolcott ,H Gallagher ,I Kakorin ,M Roda ,S Gardiner ,A Ashkenazi

doi:10.1103/physrevd.104.072009

Abstract

We summarise the results of a study performed within the GENIE global analysis framework, revisiting the GENIE bare-nucleon cross-section tuning and, in particular, the tuning of a) the inclusive cross-section, b) the cross-section of low-multiplicity inelastic channels (single-pion and double-pion production), and c) the relative contributions of resonance and non-resonance processes to these final states. The same analysis was performed with several different comprehensive cross-section model sets available in GENIE Generator v3. In this work we performed a careful investigation of the observed tensions between exclusive and inclusive data, and installed analysis improvements to handle systematics in historic data. All tuned model configurations discussed in this paper are available through public releases of the GENIE Generator. With this paper we aim to support the consumers of these physics tunes by providing comprehensive summaries of our alternate model constructions, of the relevant datasets and their systematics, and of our tuning procedure and results.

Highlights

GENIE is an international collaboration of scientists working on a global analysis of neutrino scattering data and on the incorporation of modern theoretical inputs and experimental data into robust and predictive semiempirical comprehensive neutrino interaction simulations
Whereas many other alternative modeling elements were made available to users, they had to be enabled by individual users through an errorprone procedure that could bring substantial physics and logical inconsistencies, invalidate procedures for addressing double counting issues, and damage the level of agreement with data, often in ways that were unsuspected
In response to the community demand for alternative models, GENIE has released a number of comprehensive model configurations (CMCs) and is in the process of constructing several more

Summary

Introduction

GENIE is an international collaboration of scientists working on a global analysis of neutrino scattering data and on the incorporation of modern theoretical inputs and experimental data into robust and predictive semiempirical comprehensive neutrino interaction simulations. The way that the GENIE Collaboration approaches the process of developing, validating, characterizing, tuning, and releasing comprehensive neutrino interaction simulations came into sharp focus. The focus of the GENIE Collaboration has always been the development of universal comprehensive models, handling all probes and targets and simulating all processes across the entire kinematic phase space relevant for neutrino experiments. Whereas many other alternative modeling elements were made available to users, they had to be enabled by individual users through an errorprone procedure that could bring substantial physics and logical inconsistencies, invalidate procedures for addressing double counting issues, and damage the level of agreement with data, often in ways that were unsuspected

Objectives

Results

Conclusion