Prospects of Measuring Oscillated Decay-at-Rest Neutrinos at Long Baselines

TL;DR

This paper explores the potential of using decay-at-rest neutrinos from sources like J-PARC to measure neutrino oscillation parameters over long baselines, complementing existing experiments.

Contribution

It demonstrates the feasibility of detecting monochromatic kaon decay-at-rest neutrinos at Hyper-Kamiokande and assesses event rates and sensitivities to CP violation in liquid Argon and water detectors.

Findings

Hyper-Kamiokande can detect kaon DAR neutrinos after long-distance oscillations.

Event rate estimates for pion and muon DAR neutrinos in different detectors.

Sensitivity analysis for measuring the CP-violating phase δ_CP.

Abstract

In addition to the next generation of beam-based neutrino experiments and their associated detectors, a number of intense, low-energy neutrino production sources from decays at rest will be in operation. In this work, we explore the physics opportunities with decay-at-rest neutrinos for complementary measurements of oscillation parameters at long baselines. The J-PARC Spallation Neutron Source, for example, will generate neutrinos from a variety of decay-at-rest (DAR) processes, specifically those of pions, muons, and kaons. Other proposed sources will produce large numbers of stopped pions and muons. We demonstrate the ability of the upcoming Hyper-Kamiokande experiment to detect the monochromatic kaon decay-at-rest neutrinos from J-PARC after they have travelled several hundred kilometers and undergone oscillations. This measurement will serve as a valuable cross-check in constraining our understanding of neutrino oscillations in a new regime of neutrino energy and baseline length. We also study the expected event rates from pion and muon DAR neutrinos in liquid Argon and water detectors and their sensitivities to to the CP violating phase $\delta_\mathrm{CP}$.