Higgs lepton flavour violation: UV completions and connection to neutrino masses

A bstract We study lepton violating Higgs (HLFV) decays, first from the effective field theory (EFT) point of view, and then analysing the different high-energy realizations of the operators of the EFT, highlighting the most promising models. We argue why two Higgs doublet models can have a BR( h →...

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Bibliographic Details
Published in:The journal of high energy physics 2016-11, Vol.2016 (11), p.1-45, Article 84
Main Authors: Herrero-García, Juan, Rius, Nuria, Santamaria, Arcadi
Format: Article
Language:English
Subjects:
Beyond Standard Model
Classical and Quantum Gravitation
Decay
Elementary Particles
Field theory
Flavor (particle physics)
Higgs Physics
High energy physics
Leptons
Mathematical models
Neutrino Physics
Neutrinos
Operators
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
String Theory
Symmetry
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Summary:A bstract We study lepton violating Higgs (HLFV) decays, first from the effective field theory (EFT) point of view, and then analysing the different high-energy realizations of the operators of the EFT, highlighting the most promising models. We argue why two Higgs doublet models can have a BR( h → τ μ ) ∼ 0 . 01, and why this rate is suppressed in all other realizations including vector-like leptons. We further discuss HLFV in the context of neutrino mass models: in most cases it is generated at one loop giving always BR( h → τ μ ) < 10 −4 and typically much less, which is beyond experimental reach. However, both the Zee model and extended left-right symmetric models contain extra SU(2) doublets coupled to leptons and could in principle account for the observed excess, with interesting connections between HLFV and neutrino parameters.
ISSN:1029-8479
1126-6708
1029-8479
DOI:10.1007/JHEP11(2016)084