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Title: Constraining A4 leptonic flavour model parameters at colliders and beyond

Abstract

The observed pattern of mixing in the neutrino sector may be explained by the presence of a non-Abelian, discrete flavour symmetry broken into residual subgroups at low energies. Many flavour models require the presence of Standard Model singlet scalars which can promptly decay to charged leptons in a flavour-violating manner. We constrain the model parameters of a generic $$A_4$$ leptonic flavour model using a synergy of experimental data including limits from charged lepton flavour conversion, an 8 TeV collider analysis and constraints from the anomalous magnetic moment of the muon. The most powerful constraints derive from the MEG collaborations' limit on Br$$\left(\mu\to e\gamma\right)$$ and the reinterpretation of an 8 TeV ATLAS search for anomalous productions of multi-leptonic final states. We quantify the exclusionary power of each of these experiments and identify regions where the constraints from collider and MEG experimental data are complementary.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. New York Univ., New York, NY (United States)
  2. Univ. of Cincinnati, Cincinnati, OH (United States)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. Univ. of Southampton, Southampton (United Kingdom)
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:
1487403
Report Number(s):
arXiv:1810.05648; FERMILAB-PUB-18-548-CD-T; NSF ACI-1450310; PHY-1505463
Journal ID: ISSN 1029-8479; 1698425
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 4; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Phenomenological Models

Citation Formats

Heinrich, Lukas, Schulz, Holger, Turner, Jessica, and Zhou, Ye -Ling. Constraining A4 leptonic flavour model parameters at colliders and beyond. United States: N. p., 2019. Web. doi:10.1007/JHEP04(2019)144.
Heinrich, Lukas, Schulz, Holger, Turner, Jessica, & Zhou, Ye -Ling. Constraining A4 leptonic flavour model parameters at colliders and beyond. United States. doi:10.1007/JHEP04(2019)144.
Heinrich, Lukas, Schulz, Holger, Turner, Jessica, and Zhou, Ye -Ling. Wed . "Constraining A4 leptonic flavour model parameters at colliders and beyond". United States. doi:10.1007/JHEP04(2019)144. https://www.osti.gov/servlets/purl/1487403.
@article{osti_1487403,
title = {Constraining A4 leptonic flavour model parameters at colliders and beyond},
author = {Heinrich, Lukas and Schulz, Holger and Turner, Jessica and Zhou, Ye -Ling},
abstractNote = {The observed pattern of mixing in the neutrino sector may be explained by the presence of a non-Abelian, discrete flavour symmetry broken into residual subgroups at low energies. Many flavour models require the presence of Standard Model singlet scalars which can promptly decay to charged leptons in a flavour-violating manner. We constrain the model parameters of a generic $A_4$ leptonic flavour model using a synergy of experimental data including limits from charged lepton flavour conversion, an 8 TeV collider analysis and constraints from the anomalous magnetic moment of the muon. The most powerful constraints derive from the MEG collaborations' limit on Br$\left(\mu\to e\gamma\right)$ and the reinterpretation of an 8 TeV ATLAS search for anomalous productions of multi-leptonic final states. We quantify the exclusionary power of each of these experiments and identify regions where the constraints from collider and MEG experimental data are complementary.},
doi = {10.1007/JHEP04(2019)144},
journal = {Journal of High Energy Physics (Online)},
number = 4,
volume = 2019,
place = {United States},
year = {2019},
month = {4}
}

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Figures / Tables:

Figure 1 Figure 1: The tetrahedral group A4 as the full flavour symmetry and its subgroups T = Z3 and S = Z2 as residual symmetries in the charged lepton and neutrino sectors, respectively.

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