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Title: Non-Standard Interactions in Radiative Neutrino Mass Models

Abstract

Models of radiative Majorana neutrino masses require new scalars and/or fermions to induce lepton number violating interactions. We show that these new particles also generate observable neutrino nonstandard interactions (NSI) with matter. We classify radiative models as type-I or II, with type-I models containing at least one Standard Model (SM) particle inside the loop diagram generating neutrino mass, and type-II models having no SM particle inside the loop. While type-II radiative models do not generate NSI at tree-level, popular models which fall under the type-I category are shown, somewhat surprisingly, to generate observable NSI at tree-level, while being consistent with direct and indirect constraints from colliders, electroweak precision data and charged lepton flavor violation (cLFV). We survey such models where neutrino masses arise at one, two and three loops. In the prototypical Zee model which generates neutrino masses via one-loop diagrams involving charged scalars, we find that diagonal NSI can be as large as ($$8\%, 3.8\%, 43\%$$) for ($$\varepsilon_{ee},\varepsilon_{\mu \mu}, \varepsilon_{\tau \tau}$$), while off-diagonal NSI can be at most ($$1.5 \times 10^{-3}\%, 0.56\%, 0.34\%$$) for ($$\varepsilon_{e\mu},\varepsilon_{e \tau}, \varepsilon_{\mu \tau}$$). In radiative neutrino mass models using leptoquarks (LQs), $$(\varepsilon_{\mu\mu},\, \varepsilon_{\tau\tau})$$ can be as large as $$(21.6\%,\,51.7\%)$$, while $$\varepsilon_{ee}$$ and $$(\varepsilon_{e\mu},\, \varepsilon_{e\tau},\,\varepsilon_{\mu\tau})$$ can at most be 0.6\%. The most stringent constraints on the diagonal NSI are found to come from neutrino oscillation and scattering experiments, while the off-diagonal NSI are mostly constrained by low-energy processes, such as atomic parity violation and cLFV. We also comment on the future sensitivity of these models in long-baseline experiments, such as DUNE.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2];  [2]
  1. Oklahoma State U.
  2. Fermilab
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:
1556969
Report Number(s):
arXiv:1907.09498; FERMILAB-PUB-19-304-T; OSU-HEP-19-04
1745937
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:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Babu, K. S., Dev, P.S. Bhupal, Jana, Sudip, and Thapa, Anil. Non-Standard Interactions in Radiative Neutrino Mass Models. United States: N. p., 2019. Web.
Babu, K. S., Dev, P.S. Bhupal, Jana, Sudip, & Thapa, Anil. Non-Standard Interactions in Radiative Neutrino Mass Models. United States.
Babu, K. S., Dev, P.S. Bhupal, Jana, Sudip, and Thapa, Anil. Mon . "Non-Standard Interactions in Radiative Neutrino Mass Models". United States. https://www.osti.gov/servlets/purl/1556969.
@article{osti_1556969,
title = {Non-Standard Interactions in Radiative Neutrino Mass Models},
author = {Babu, K. S. and Dev, P.S. Bhupal and Jana, Sudip and Thapa, Anil},
abstractNote = {Models of radiative Majorana neutrino masses require new scalars and/or fermions to induce lepton number violating interactions. We show that these new particles also generate observable neutrino nonstandard interactions (NSI) with matter. We classify radiative models as type-I or II, with type-I models containing at least one Standard Model (SM) particle inside the loop diagram generating neutrino mass, and type-II models having no SM particle inside the loop. While type-II radiative models do not generate NSI at tree-level, popular models which fall under the type-I category are shown, somewhat surprisingly, to generate observable NSI at tree-level, while being consistent with direct and indirect constraints from colliders, electroweak precision data and charged lepton flavor violation (cLFV). We survey such models where neutrino masses arise at one, two and three loops. In the prototypical Zee model which generates neutrino masses via one-loop diagrams involving charged scalars, we find that diagonal NSI can be as large as ($8\%, 3.8\%, 43\%$) for ($\varepsilon_{ee},\varepsilon_{\mu \mu}, \varepsilon_{\tau \tau}$), while off-diagonal NSI can be at most ($1.5 \times 10^{-3}\%, 0.56\%, 0.34\%$) for ($\varepsilon_{e\mu},\varepsilon_{e \tau}, \varepsilon_{\mu \tau}$). In radiative neutrino mass models using leptoquarks (LQs), $(\varepsilon_{\mu\mu},\, \varepsilon_{\tau\tau})$ can be as large as $(21.6\%,\,51.7\%)$, while $\varepsilon_{ee}$ and $(\varepsilon_{e\mu},\, \varepsilon_{e\tau},\,\varepsilon_{\mu\tau})$ can at most be 0.6\%. The most stringent constraints on the diagonal NSI are found to come from neutrino oscillation and scattering experiments, while the off-diagonal NSI are mostly constrained by low-energy processes, such as atomic parity violation and cLFV. We also comment on the future sensitivity of these models in long-baseline experiments, such as DUNE.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}