Constraining A 4 leptonic flavour model parameters at colliders and beyond

Lukas Heinrich (Physics Department, New York University, New York, NY, 10003, U.S.A.) ; Holger Schulz (Department of Physics, University of Cincinnati, Cincinnati, OH, 45219, U.S.A.) ; Jessica Turner (Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, U.S.A.) ; Ye-Ling Zhou (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, U.K.)

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(μ → eγ) 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.

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      "value": "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\u2019 limit on Br(\u03bc \u2192 e\u03b3) 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."
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Published on:
24 April 2019
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2019 (2019)
Issue 4
Pages 1-40
DOI:
https://doi.org/10.1007/JHEP04(2019)144
arXiv:
1810.05648
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

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