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Title: Visible neutrino decay at DUNE

Abstract

If the heaviest neutrino mass eigenstate is unstable, its decay modes could include lighter neutrino eigenstates. In this case part of the decay products could be visible, as they would interact at neutrino detectors via mixing. At neutrino oscillation experiments, a characteristic signature of such \emph{visible neutrino decay} would be an apparent excess of events at low energies. We focus on a simple phenomenological model in which the heaviest neutrino decays as $$\nu_3 \rightarrow \nu_{1,2} + \phi$$, where $$\phi$$ is a new light scalar. If neutrinos are Majorana particles the helicity-flipping decays would be observable (i.e., $$\nu \to \bar\nu + \phi$$), leading to interesting observable consequences on the event rates. We compute the sensitivities of the Deep Underground Neutrino Experiment (DUNE) to the couplings of the new scalar as a function of the lightest neutrino mass. Under the assumption that only the heaviest neutrino is unstable, and for a normal mass ordering, we find that DUNE will be sensitive to values of $$\tau_3/m_3 > 1.95 - 2.6\times 10^{-10}$$~s/eV (90\% C.L.) (depending on the lightest neutrino mass), where $$\tau_3$$ and $$m_3$$ are the lifetime and mass of $$\nu_3$$, respectively.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Fermilab
  2. ICTP, Trieste
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1362065
Report Number(s):
arXiv:1705.03599; FERMILAB-PUB-17-150-T
1598760
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Coloma, Pilar, and Peres, Orlando G. Visible neutrino decay at DUNE. United States: N. p., 2017. Web.
Coloma, Pilar, & Peres, Orlando G. Visible neutrino decay at DUNE. United States.
Coloma, Pilar, and Peres, Orlando G. Tue . "Visible neutrino decay at DUNE". United States. doi:. https://www.osti.gov/servlets/purl/1362065.
@article{osti_1362065,
title = {Visible neutrino decay at DUNE},
author = {Coloma, Pilar and Peres, Orlando G.},
abstractNote = {If the heaviest neutrino mass eigenstate is unstable, its decay modes could include lighter neutrino eigenstates. In this case part of the decay products could be visible, as they would interact at neutrino detectors via mixing. At neutrino oscillation experiments, a characteristic signature of such \emph{visible neutrino decay} would be an apparent excess of events at low energies. We focus on a simple phenomenological model in which the heaviest neutrino decays as $\nu_3 \rightarrow \nu_{1,2} + \phi$, where $\phi$ is a new light scalar. If neutrinos are Majorana particles the helicity-flipping decays would be observable (i.e., $\nu \to \bar\nu + \phi$), leading to interesting observable consequences on the event rates. We compute the sensitivities of the Deep Underground Neutrino Experiment (DUNE) to the couplings of the new scalar as a function of the lightest neutrino mass. Under the assumption that only the heaviest neutrino is unstable, and for a normal mass ordering, we find that DUNE will be sensitive to values of $\tau_3/m_3 > 1.95 - 2.6\times 10^{-10}$~s/eV (90\% C.L.) (depending on the lightest neutrino mass), where $\tau_3$ and $m_3$ are the lifetime and mass of $\nu_3$, respectively.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {Tue May 09 00:00:00 EDT 2017},
month = {Tue May 09 00:00:00 EDT 2017}
}