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Title: Generalized mass ordering degeneracy in neutrino oscillation experiments

Abstract

Here, we consider the impact of neutral-current (NC) nonstandard neutrino interactions (NSI) on the determination of the neutrino mass ordering. We show that in the presence of NSI there is an exact degeneracy which makes it impossible to determine the neutrino mass ordering and the octant of the solar mixing angle θ 12 at oscillation experiments. The degeneracy holds at the probability level and for arbitrary matter density profiles, and hence solar, atmospheric, reactor, and accelerator neutrino experiments are affected simultaneously. The degeneracy requires order-1 corrections from NSI to the NC electron neutrino-quark interaction and can be tested in electron neutrino NC scattering experiments.

Authors:
 [1];  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Accelerator Division
  2. Karlsruhe Inst. of Technology (KIT), Karlsruhe (Germany)
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:
1342217
Report Number(s):
FERMILAB-PUB-16-115-T; arXiv:1604.05772
Journal ID: ISSN 2470-0010; PRVDAQ; 1449899; TRN: US1701658
Grant/Contract Number:
AC02-07CH11359; 674896
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Coloma, Pilar, and Schwetz, Thomas. Generalized mass ordering degeneracy in neutrino oscillation experiments. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.055005.
Coloma, Pilar, & Schwetz, Thomas. Generalized mass ordering degeneracy in neutrino oscillation experiments. United States. doi:10.1103/PhysRevD.94.055005.
Coloma, Pilar, and Schwetz, Thomas. 2016. "Generalized mass ordering degeneracy in neutrino oscillation experiments". United States. doi:10.1103/PhysRevD.94.055005. https://www.osti.gov/servlets/purl/1342217.
@article{osti_1342217,
title = {Generalized mass ordering degeneracy in neutrino oscillation experiments},
author = {Coloma, Pilar and Schwetz, Thomas},
abstractNote = {Here, we consider the impact of neutral-current (NC) nonstandard neutrino interactions (NSI) on the determination of the neutrino mass ordering. We show that in the presence of NSI there is an exact degeneracy which makes it impossible to determine the neutrino mass ordering and the octant of the solar mixing angle θ12 at oscillation experiments. The degeneracy holds at the probability level and for arbitrary matter density profiles, and hence solar, atmospheric, reactor, and accelerator neutrino experiments are affected simultaneously. The degeneracy requires order-1 corrections from NSI to the NC electron neutrino-quark interaction and can be tested in electron neutrino NC scattering experiments.},
doi = {10.1103/PhysRevD.94.055005},
journal = {Physical Review D},
number = 5,
volume = 94,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 8works
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  • Cited by 8
  • If the lepton mixing angle {theta}{sub 23} is not maximal, there arises a problem of ambiguity in determining {theta}{sub 23} due to the existence of two degenerate solutions, one in the first and the other in the second octant. We discuss an experimental strategy for resolving the {theta}{sub 23} octant degeneracy by combining reactor measurement of {theta}{sub 13} with accelerator {nu}{sub {mu}} disappearance and {nu}{sub e} appearance experiments. The robustness of the {theta}{sub 23} degeneracy and the difficulty in lifting it only by accelerator experiments with conventional {nu}{sub {mu}} (and {nu}{sub {mu}}) beams are demonstrated by analytical and numerical treatments.more » Our method offers a way to overcome the difficulty and can resolve the degeneracy between solutions sin{sup 2}{theta}{sub 23}=0.4 and sin{sup 2}{theta}{sub 23}=0.6 if sin{sup 2}2{theta}{sub 13} > or approx. 0.05 at 95% CL by assuming the T2K phase II experiment and a reactor measurement with an exposure of 10 GW{center_dot}kt{center_dot}yr. The dependence of the resolving power of the octant degeneracy on the systematic errors of reactor experiments is also examined.« less
  • We review the current status of the neutrino mass and mixing parameters needed to reconstruct the neutrino mass matrix. A comparative study of the precision in the measurement of oscillation parameters expected from the next-generation solar, atmospheric, reactor-and accelerator-based neutrino experiments is presented. We discuss the potential of 0{nu}{beta}{beta} experiments in determining the neutrino mass hierarchy and the importance of a better {theta}{sub 12} measurement for it.
  • The standard theory describing neutrino oscillations only uses the interactions predicted by the Standard Model of particle physics. However, there is plenty of room for non-standard interactions (NSI) to exist. This is because extra interactions are allowed by experimental error bars and even expected at some level from effective theory arguments. This research is focused on examining the phenomenological consequences of the new physics of NSI at large atmospheric neutrino detectors like IceCube DeepCore. Of particular focus are the degeneracies between and within the standard neutrino oscillation parameters and the NSI parameters. These degeneracies will be explored both analytically andmore » numerically, and strategies to lift them will also be discussed. This research is largely based on [1].« less