A global analysis strategy to resolve neutrino NSI degeneracies with scattering and oscillation data

Bhaskar Dutta,Rafael F Lang,Adrian Thompson,Shu Liao,Louis Strigari,Samiran Sinha

doi:10.1007/jhep09(2020)106

Bhaskar Dutta, Rafael F Lang + Show 4 more

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https://doi.org/10.1007/jhep09(2020)106

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Abstract

Neutrino non-standard interactions (NSI) with the first generation of standard model fermions can span a parameter space of large dimension and exhibit degeneracies that cannot be broken by a single class of experiment. Oscillation experiments, together with neutrino scattering experiments, can merge their observations into a highly informational dataset to combat this problem. We consider combining neutrino-electron and neutrino-nucleus scattering data from the Borexino and COHERENT experiments, including a projection for the upcoming coherent neutrino scattering measurement at the CENNS-10 liquid argon detector. We extend the reach of these data sets over the NSI parameter space with projections for neutrino scattering at a future multi-ton scale dark matter detector and future oscillation measurements from atmospheric neutrinos at the Deep Underground Neutrino Experiment (DUNE). In order to perform this global anal- ysis, we adopt a novel approach using the copula method, utilized to combine posterior information from different experiments with a large, generalized set of NSI parameters. We find that the contributions from DUNE and a dark matter detector to the Borexino and COHERENT fits can improve constraints on the electron and quark NSI parameters by up to a factor of 2 to 3, even when relatively many NSI parameters are left free to vary in the analysis.

Highlights

Neutrino non-standard interactions (NSI) with the first generation of standard model fermions can span a parameter space of large dimension and exhibit degeneracies that cannot be broken by a single class of experiment
We find that the contributions from Deep Underground Neutrino Experiment (DUNE) and a dark matter detector to the Borexino and COHERENT fits can improve constraints on the electron and quark NSI parameters by up to a factor of 2 to 3, even when relatively many NSI parameters are left free to vary in the analysis
Using the methods we have just described, we derive the fits to the NSI parameters at each stage of the “prior-flow” outlined in figure 3, with a final joint posterior distribution derived from the last stage at DUNE

Summary

Introduction

Neutrino non-standard interactions (NSI) with the first generation of standard model fermions can span a parameter space of large dimension and exhibit degeneracies that cannot be broken by a single class of experiment. We extend the reach of these data sets over the NSI parameter space with projections for neutrino scattering at a future multi-ton scale dark matter detector and future oscillation measurements from atmospheric neutrinos at the Deep Underground Neutrino Experiment (DUNE). In order to perform this global analysis, we adopt a novel approach using the copula method, utilized to combine posterior information from different experiments with a large, generalized set of NSI parameters. Dimension-6 neutral-current (NC) vector NSI among the first-generation of SM fermions with real-valued couplings. They are described by the effective Lagrangian. In this work we are motivated to instead take an approach which is substantially more modelindependent and generalized to more degrees of freedom

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