Constraining A4 leptonic flavour model parameters at colliders and beyond
Constraining A4 leptonic flavour model parameters at colliders and beyond
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.
Phenomenological Models
1-39
Heinrich, Lukas
005f80e8-c6d3-4c53-af43-dc3885adeb30
Schulz, Holger
05d1d455-f27e-4e52-919f-08963742aabf
Turner, Jessica
878a743d-6697-4d49-a632-b6c6d51890d3
Zhou, Ye Ling
ee7044b2-b38d-4a2d-ae3d-f1b14cf86b1b
April 2019
Heinrich, Lukas
005f80e8-c6d3-4c53-af43-dc3885adeb30
Schulz, Holger
05d1d455-f27e-4e52-919f-08963742aabf
Turner, Jessica
878a743d-6697-4d49-a632-b6c6d51890d3
Zhou, Ye Ling
ee7044b2-b38d-4a2d-ae3d-f1b14cf86b1b
Heinrich, Lukas, Schulz, Holger, Turner, Jessica and Zhou, Ye Ling
(2019)
Constraining A4 leptonic flavour model parameters at colliders and beyond.
Journal of High Energy Physics, 2019 (144), , [144].
(doi:10.1007/JHEP04(2019)144).
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(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.
Text
Heinrich 2019 Article Constraining A4 Leptonic Flavour
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Accepted/In Press date: 10 April 2019
e-pub ahead of print date: 24 April 2019
Published date: April 2019
Keywords:
Phenomenological Models
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Local EPrints ID: 430714
URI: http://eprints.soton.ac.uk/id/eprint/430714
ISSN: 1126-6708
PURE UUID: 9f7964dc-8a17-4b67-ad14-c3f868c988a2
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Date deposited: 09 May 2019 16:30
Last modified: 17 Mar 2024 12:26
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Contributors
Author:
Lukas Heinrich
Author:
Holger Schulz
Author:
Jessica Turner
Author:
Ye Ling Zhou
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