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Title: On the Impact of Neutrino Decays on the Supernova Neutronization-Burst Flux

Abstract

The discovery of non-zero neutrino masses invites one to consider decays of heavier neutrinos into lighter ones. We investigate the impact of two-body decays of neutrinos on the neutronization burst of a core-collapse supernova -- the large burst of $$\nu_e$$ during the first 25 ms post core-bounce. In the models we consider, the $$\nu_e$$, produced mainly as a $$\nu_3\,(\nu_2)$$ in the normal (inverted) mass ordering, are allowed to decay to $$\nu_1\,(\nu_3)$$ or $$\bar{\nu}_1\,(\bar{\nu}_3)$$, and an almost massless scalar. These decays can lead to the appearance of a neutronization peak for a normal mass ordering or the disappearance of the same peak for the inverted one, thereby allowing one mass ordering to mimic the other. Simulating supernova-neutrino data at the Deep Underground Neutrino Experiment (DUNE) and the Hyper-Kamiokande (HK) experiment, we compute their sensitivity to the neutrino lifetime. We find that, if the mass ordering is known, and depending on the nature of the Physics responsible for the neutrino decay, DUNE is sensitive to lifetimes $$\tau/m \lesssim 10^6$$ s/eV for a galactic SN sufficiently close-by (around 10 kpc), while HK is sensitive to lifetimes $$\tau/m \lesssim 10^7$$ s/eV. These sensitivities are far superior to existing limits from solar-system-bound oscillation experiments. Finally, we demonstrate that using a combination of data from DUNE and HK, one can, in general, distinguish between decaying Dirac neutrinos and decaying Majorana neutrinos.

Authors:
 [1];  [2];  [3]
  1. Northwestern U.
  2. Fermilab
  3. UC, Berkeley
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:
1571807
Report Number(s):
arXiv:1910.01127; NUHEP-TH/19-012; FERMILAB-PUB-19-508-T
oai:inspirehep.net:1757432
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

de Gouvêa, André, Martinez-Soler, Ivan, and Sen, Manibrata. On the Impact of Neutrino Decays on the Supernova Neutronization-Burst Flux. United States: N. p., 2019. Web.
de Gouvêa, André, Martinez-Soler, Ivan, & Sen, Manibrata. On the Impact of Neutrino Decays on the Supernova Neutronization-Burst Flux. United States.
de Gouvêa, André, Martinez-Soler, Ivan, and Sen, Manibrata. Wed . "On the Impact of Neutrino Decays on the Supernova Neutronization-Burst Flux". United States. https://www.osti.gov/servlets/purl/1571807.
@article{osti_1571807,
title = {On the Impact of Neutrino Decays on the Supernova Neutronization-Burst Flux},
author = {de Gouvêa, André and Martinez-Soler, Ivan and Sen, Manibrata},
abstractNote = {The discovery of non-zero neutrino masses invites one to consider decays of heavier neutrinos into lighter ones. We investigate the impact of two-body decays of neutrinos on the neutronization burst of a core-collapse supernova -- the large burst of $\nu_e$ during the first 25 ms post core-bounce. In the models we consider, the $\nu_e$, produced mainly as a $\nu_3\,(\nu_2)$ in the normal (inverted) mass ordering, are allowed to decay to $\nu_1\,(\nu_3)$ or $\bar{\nu}_1\,(\bar{\nu}_3)$, and an almost massless scalar. These decays can lead to the appearance of a neutronization peak for a normal mass ordering or the disappearance of the same peak for the inverted one, thereby allowing one mass ordering to mimic the other. Simulating supernova-neutrino data at the Deep Underground Neutrino Experiment (DUNE) and the Hyper-Kamiokande (HK) experiment, we compute their sensitivity to the neutrino lifetime. We find that, if the mass ordering is known, and depending on the nature of the Physics responsible for the neutrino decay, DUNE is sensitive to lifetimes $\tau/m \lesssim 10^6$ s/eV for a galactic SN sufficiently close-by (around 10 kpc), while HK is sensitive to lifetimes $\tau/m \lesssim 10^7$ s/eV. These sensitivities are far superior to existing limits from solar-system-bound oscillation experiments. Finally, we demonstrate that using a combination of data from DUNE and HK, one can, in general, distinguish between decaying Dirac neutrinos and decaying Majorana neutrinos.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {10}
}