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Title: Dipole portal to heavy neutral leptons

Abstract

We consider generic neutrino dipole portals between left-handed neutrinos, photons, and right-handed heavy neutral leptons (HNL) with Dirac masses. The dominance of this portal significantly alters the conventional phenomenology of HNLs. We derive a comprehensive set of constraints on the dipole portal to HNLs by utilizing data from LEP, LHC, MiniBooNE, LSND as well as observations of Supernova 1987A and consistency of the standard big bang nucleosynthesis. We calculate projected sensitivities from the proposed high-intensity SHiP beam dump experiment, and the ongoing experiments at the Short-Baseline Neutrino facility at Fermilab. Dipole mediated Primakoff neutrino upscattering and Dalitz-like meson decays are found to be the main production mechanisms in most of the parametric regime under consideration. In conclusion, proposed explanations of LSND and MiniBooNE anomalies based on HNLs with dipole-induced decays are found to be severely constrained, or to be tested in the future experiments.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada); McMaster Univ., Hamilton, ON (Canada)
  2. Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada); Univ. of Victoria, Victoria, BC (Canada); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1497099
Report Number(s):
arXiv:1803.03262; FERMILAB-PUB-18-745-A
Journal ID: ISSN 2470-0010; PRVDAQ; 1659293
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 11; 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

Magill, Gabriel, Plestid, Ryan, Pospelov, Maxim, and Tsai, Yu -Dai. Dipole portal to heavy neutral leptons. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.115015.
Magill, Gabriel, Plestid, Ryan, Pospelov, Maxim, & Tsai, Yu -Dai. Dipole portal to heavy neutral leptons. United States. https://doi.org/10.1103/PhysRevD.98.115015
Magill, Gabriel, Plestid, Ryan, Pospelov, Maxim, and Tsai, Yu -Dai. Tue . "Dipole portal to heavy neutral leptons". United States. https://doi.org/10.1103/PhysRevD.98.115015. https://www.osti.gov/servlets/purl/1497099.
@article{osti_1497099,
title = {Dipole portal to heavy neutral leptons},
author = {Magill, Gabriel and Plestid, Ryan and Pospelov, Maxim and Tsai, Yu -Dai},
abstractNote = {We consider generic neutrino dipole portals between left-handed neutrinos, photons, and right-handed heavy neutral leptons (HNL) with Dirac masses. The dominance of this portal significantly alters the conventional phenomenology of HNLs. We derive a comprehensive set of constraints on the dipole portal to HNLs by utilizing data from LEP, LHC, MiniBooNE, LSND as well as observations of Supernova 1987A and consistency of the standard big bang nucleosynthesis. We calculate projected sensitivities from the proposed high-intensity SHiP beam dump experiment, and the ongoing experiments at the Short-Baseline Neutrino facility at Fermilab. Dipole mediated Primakoff neutrino upscattering and Dalitz-like meson decays are found to be the main production mechanisms in most of the parametric regime under consideration. In conclusion, proposed explanations of LSND and MiniBooNE anomalies based on HNLs with dipole-induced decays are found to be severely constrained, or to be tested in the future experiments.},
doi = {10.1103/PhysRevD.98.115015},
journal = {Physical Review D},
number = 11,
volume = 98,
place = {United States},
year = {Tue Dec 11 00:00:00 EST 2018},
month = {Tue Dec 11 00:00:00 EST 2018}
}

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Cited by: 62 works
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Figures / Tables:

Figure 1 Figure 1: Overview of projected sensitivities (95% CL) and constraints obtained from SHiP, LHC, LEP, Supernova 1987A and experiments at the Short-Baseline Neutrino facility at Fermilab. We also show previously calculated favored regions of interest (ROI) in parameter space for MiniBooNE and LSND, and constraints from NOMAD. Limits are shownmore » for the dimension 5 (γ mediator) and dimension 6 (γ + Z mediators) extensions. See Table II for an explanation of the labels. Each curve is discussed and presented in the paper.« less

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