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

Journal Article · · Journal of High Energy Physics (Online)
 [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)
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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.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1487403
Report Number(s):
arXiv:1810.05648; FERMILAB-PUB-18-548-CD-T; NSF ACI-1450310; PHY-1505463; 1698425
Journal Information:
Journal of High Energy Physics (Online), Vol. 2019, Issue 4; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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