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Full parameter scan of the Zee model: exploring Higgs lepton flavor violation
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
KTH, Superseded Departments, Physics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We study the general Zee model, which includes an extra Higgs scalar doublet and a new singly-charged scalar singlet. Neutrino masses are generated at one-loop level, and in order to describe leptonic mixing, both the Standard Model and the extra Higgs scalar doublets need to couple to leptons (in a type-III two-Higgs doublet model), which necessarily generates large lepton flavor violating signals, also in Higgs decays. Imposing all relevant phenomenological constraints and performing a full numerical scan of the parameter space, we find that both normal and inverted neutrino mass orderings can be fitted, although the latter is disfavored with respect to the former. In fact, inverted ordering can only be accommodated if θ23 turns out to be in the first octant. A branching ratio for h→τμ of up to 10−2 is allowed, but it could be as low as 10−6. In addition, if future expected sensitivities of τ→μγ are achieved, normal ordering can be completely tested. Also, μeconversion is expected to strongly reduce the allowed parameter space, excluding completely inverted ordering. Furthermore, non-standard neutrino interactions are found to be smaller than 10−6, which is well below future experimental sensitivity. Finally, the results of our scan indicate that the masses of the additional scalars have to be below 2.5 TeV, and typically they are lower than that and therefore within the reach of the LHC and future colliders.

National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-202306OAI: oai:DiVA.org:kth-202306DiVA, id: diva2:1075697
Note

QC 20170221

Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2017-02-21Bibliographically approved
In thesis
1. Phenomenology of neutrino properties, unification, and Higgs couplings beyond the Standard Model
Open this publication in new window or tab >>Phenomenology of neutrino properties, unification, and Higgs couplings beyond the Standard Model
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The vast majority of experiments in particle physics can be described by the Standard Model of particle physics (SM). However, there are indications for physics beyond it. The only experimentally demonstrated problem of the model is the difficulty to describe neutrino masses and leptonic mixing. There is a plethora of models that try to describe these phenomena and this thesis investigates several possibilities for new models, both full theories and effective frameworks.

 

The values of the parameters in a model are dependent on the energy scale and we say that the parameters run. The exact behavior of the running depends on the model and it provides a signature of the model. For a model defined at high energies it is necessary to run the parameters down to the electroweak scale in order to perform a comparison to the known values of observed quantities. In this thesis, we discuss renormalization group running in the context of extra dimensions and we provide an upper limit on the cutoff scale. We perform renormalization group running in two versions of a non-supersymmetric SO(10) model and we show that the SM parameters can be accommodated in both versions. In addition, we perform the running for the gauge couplings in a large set of radiative neutrino mass models and conclude that unification is possible in some of them.

 

The Higgs boson provides new possibilities to study physics beyond the SM. Its properties have to be tested with extremely high precision before it could be established whether the particle is truly the SM Higgs boson or not. In this thesis, we perform Bayesian parameter inference and model comparison. For models where the magnitude of the Higgs couplings is varied, we show that the SM is favored in comparison to all other models. Furthermore, we discuss lepton flavor violating processes in the context of the Zee model. We find that these can be sizeable and close to the experimental limits.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 98
Series
TRITA-FYS, ISSN 0280-316X ; 2017:10
Keywords
Effective field theories, neutrino physics, extra dimensions, universal extra dimensions, Higgs physics, renormalization group running, Bayesian statistics, grand unified theories
National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-202311 (URN)978-91-7729-298-2 (ISBN)
Public defence
2017-03-24, FB53, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170221

Available from: 2017-02-21 Created: 2017-02-20 Last updated: 2017-02-23Bibliographically approved

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https://arxiv.org/abs/1701.05345

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