$D - \bar{D}$ MIXING FROM NEUTRINO MIXING IN SUSY FLIPPED SU(5) MODEL

2008 ◽  
Vol 23 (21) ◽  
pp. 3334-3338
Author(s):  
WEI LIAO
Keyword(s):  
Neutrino Mixing ◽  
Yukawa Couplings ◽  
Left Handed

We point out that in SUSY flipped SU(5) model the bilarge neutrino mixing which can be accommodated in the lepton Yukawa couplings can induce interesting flavor mixings for the left-handed charged slepton and right-handed up-type squark. FCNC processes such as τ → μ + γ, [Formula: see text] mixing and t → u, c + h0 are predicted.

scholarly journals The singly-charged scalar singlet as the origin of neutrino masses

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Tobias Felkl ◽  
Juan Herrero-García ◽  
Michael A. Schmidt
Keyword(s):  
Mass Matrix ◽  
Boson Mass ◽  
Neutrino Masses ◽  
Charged Scalar ◽  
Yukawa Couplings ◽  
Left Handed ◽  
Flavour Violation ◽  
Singly Charged ◽  
Charged Lepton Sector ◽  
Scalar Singlet

Abstract We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix. This yields a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective of how the breaking of lepton-number conservation is achieved. The constraint disfavours large hierarchies among the Yukawa couplings. We study the implications for the phenomenology of lepton-flavour universality, measurements of the W-boson mass, flavour violation in the charged-lepton sector and decays of the singly-charged scalar singlet. We also discuss the parameter space that can address the Cabibbo Angle Anomaly.

scholarly journals Enhanced $\Gamma(p\to K^0\mu^+)/\Gamma(p\to K^+\bar{\nu}_\mu)$ as a signature of minimal renormalizable SUSY SO (10) GUT

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Naoyuki Haba ◽  
Yukihiro Mimura ◽  
Toshifumi Yamada
Keyword(s):  
Partial Width ◽  
Width Ratio ◽  
Detailed Knowledge ◽  
Main Body ◽  
Grand Unified Theory ◽  
Plausible Assumption ◽  
Decay Modes ◽  
Yukawa Couplings ◽  
2Nd Generation ◽  
Left Handed

Abstract The ratio of the partial widths of some dimension-5 proton decay modes can be predicted without detailed knowledge of supersymmetric (SUSY) particle masses, and this allows us to experimentally test various SUSY grand unified theory (GUT) models without discovering SUSY particles. In this paper, we study the ratio of the partial widths of the $p\to K^0\mu^+$ and $p\to K^+\bar{\nu}_\mu$ decays in the minimal renormalizable SUSY $SO(10)$ GUT, under only a plausible assumption that the 1st- and 2nd-generation left-handed squarks are mass-degenerate. In the model, we expect that the Wilson coefficients of dimension-5 operators responsible for these modes are on the same order and that the ratio of $p\to K^0\mu^+$ and $p\to K^+\bar{\nu}_\mu$ partial widths is $O(0.1)$. Hence, we may be able to detect both $p\to K^0\mu^+$ and $p\to K^+\bar{\nu}_\mu$ decays at Hyper-Kamiokande, thereby gaining a hint for the minimal renormalizable SUSY $SO(10)$ GUT. Moreover, since this partial width ratio is quite suppressed in the minimal $SU(5)$ GUT, it allows us to distinguish the minimal renormalizable SUSY $SO(10)$ GUT from the minimal $SU(5)$ GUT. In the main body of the paper, we perform a fitting of the quark and lepton masses and flavor mixings with the Yukawa couplings of the minimal renormalizable $SO(10)$ GUT, and derive a concrete prediction for the partial width ratio based on the fitting results. We find that the partial width ratio generally varies in the range $0.05$–$0.6$, confirming the above expectation.

scholarly journals ON FERMION ZERO MODES IN INSTANTON V - A MODELS WITH SPONTANEOUS SYMMETRY BREAKING

1994 ◽  
Vol 09 (08) ◽  
pp. 715-723
Author(s):  
KAMRAN SARIRIAN
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Electroweak Theory ◽  
Yukawa Couplings ◽  
Zero Modes ◽  
Left Handed ◽  
Fermion Masses ◽  
Left And Right

The left- and right-handed fermion zero modes are examined. Their behavior under the variation of the size of the instanton, ρ I , and the size of the Higgs core, ρ H , for a range of Yukawa couplings corresponding to the fermion masses in the electroweak theory are studied. It is shown that the characteristic radii of the zero modes, in particular those of the left-handed fermions, are locked to the instanton size, and are not affected by the variation of ρ H , except for fermion masses much larger than those in the standard electroweak theory.

scholarly journals Left-Handed Neutrinos, Charged Dark Matters, Universe Evolution and Extended Standard Model

2019 ◽  
Author(s):  
Jae-Kwang Hwang
Keyword(s):  
Dark Matter ◽  
Rest Mass ◽  
Big Bang ◽  
Point Of View ◽  
Neutrino Mixing ◽  
Left Handed ◽  
Lepton Charge ◽  
Dark Matters ◽  
The Right ◽  
Universe Evolution

In the present work, the charged dark matters of B1, B2 and B3 bastons are explained as the right-handed partners of the left-handed neutrinos. And the rest masses of the elementary particles depend on their charge configurations. The left-handed neutrinos have only the lepton charges (LC) and the right-handed dark matters have only the electric charges (EC). This explains the fact that the rest masses of the left-handed neutrinos are so small, and the rest masses of the right-handed dark matters are relatively very large. The proposed rest mass (26.12 eV/c2) of the B1 dark matter is indirectly confirmed from the supernova 1987A data. The missing neutrinos are newly explained by using the dark matters and lepton charge force. The neutrino excess anomaly of the MinibooNE data is explained by the B1 dark matter scattering within the Cherenkov detectors. The quark mixing and neutrino mixing are not required in the present model. It is shown that our matter universe and its partner antimatter universe can be created from the big bang in the point of view of time -, charge -, space -, and quantum state – symmetric universe evolution.

scholarly journals PRIVATE HIGGS AT THE LHC

2013 ◽  
Vol 28 (28) ◽  
pp. 1350149 ◽  
Author(s):  
YONI BENTOV ◽  
A. ZEE
Keyword(s):  
Dark Matter ◽  
Degrees Of Freedom ◽  
Vacuum Expectation ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Leading Order ◽  
Expectation Values ◽  
Mixing Angles ◽  
Yukawa Couplings

We study the LHC phenomenology of a general class of "Private Higgs" (PH) models, in which fermions obtain their masses from their own Higgs doublets with [Formula: see text] Yukawa couplings, and the mass hierarchy is translated into a dynamical chain of vacuum expectation values. This is accomplished by introducing a number of light gauge-singlet scalars, the "darkons," some of which could play the role of dark matter. These models allow for substantial modifications to the decays of the lightest Higgs boson, for instance through mixing with TeV-scale PH fields and light darkons: in particular, one could accommodate [Formula: see text] flavor-uncorrelated deviations from the SM [Formula: see text] vertices with TeV-scale degrees of freedom. We also discuss a new implementation of the PH framework, in which the quark and neutrino mixing angles arise as one-loop corrections to the leading order picture.

scholarly journals Large neutrino mixing with the universal strength of the Yukawa couplings

2000 ◽  
Vol 62 (7) ◽  
Author(s):  
G. C. Branco ◽  
M. N. Rebelo ◽  
J. I. Silva-Marcos
Keyword(s):  
Neutrino Mixing ◽  
Yukawa Couplings

scholarly journals The Grimus–Neufeld Model with FlexibleSUSY at One-Loop

Symmetry ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1418
Author(s):  
Simonas Draukšas ◽  
Vytautas Dūdėnas ◽  
Thomas Gajdosik ◽  
Andrius Juodagalvis ◽  
Paulius Juodsnukis ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Mass Generation ◽  
Seesaw Mechanism ◽  
Yukawa Couplings ◽  
Restricted Parameter Space ◽  
The Standard Model ◽  
Analytic Expressions ◽  
Mixing Matrix

The Grimus–Neufeld model can explain the smallness of measured neutrino masses by extending the Standard Model with a single heavy neutrino and a second Higgs doublet, using the seesaw mechanism and radiative mass generation. The Grimus–Lavoura approximation allows us to calculate the light neutrino masses analytically. By inverting these analytic expressions, we determine the neutrino Yukawa couplings from the measured neutrino mass differences and the neutrino mixing matrix. Short-cutting the full renormalization of the model, we implement the Grimus–Neufeld model in the spectrum calculator FlexibleSUSY and check the consistency of the implementation. These checks hint that FlexibleSUSY is able to do the job of numerical renormalization in a restricted parameter space. As a summary, we also comment on further steps of the implementation and the use of FlexibleSUSY for the model.

scholarly journals Left-Handed Neutrinos, Charged Dark Matters, Higgs Mechanism, Universe Evolution and Extended Standard Model

2019 ◽  
Author(s):  
Jae-Kwang Hwang
Keyword(s):  
Dark Matter ◽  
Rest Mass ◽  
Big Bang ◽  
Higgs Mechanism ◽  
Point Of View ◽  
Neutrino Mixing ◽  
Left Handed ◽  
Dark Matters ◽  
The Right ◽  
Universe Evolution

In the present work, the charged dark matters of B1, B2 and B3 bastons are explained as the right-handed partners of the left-handed neutrinos. The new Higgs mechanism of SU(2)DM×SU(2)Weak×SU(2)Strong  including electromagnetic and gravitational forces is applied. And the rest masses of the elementary particles depend on their charge configurations. The left-handed neutrinos have only the lepton charges (LC) and the right-handed dark matters have only the electric charges (EC). This explains the fact that the rest masses of the left-handed neutrinos are so small, and the rest masses of the right-handed dark matters are relatively very large. The proposed rest mass (26.12 eV/c2) of the B1 dark matter is indirectly confirmed from the supernova 1987A data. The missing neutrinos are newly explained by using the dark matters and lepton charge force. The neutrino excess anomaly of the MinibooNE data is explained by the B1 dark matter scattering within the Cherenkov detectors. The quark mixing and neutrino mixing are not required in the present model. It is shown that our matter universe and its partner antimatter universe can be created from the big bang in the point of view of time -, charge -, space -, and quantum state – symmetric universe evolution.

scholarly journals Light mass window of lepton portal dark matter

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Shohei Okawa ◽  
Yuji Omura
Keyword(s):  
Dark Matter ◽  
Scalar Potential ◽  
Neutrino Flux ◽  
Mass Region ◽  
Neutrino Telescopes ◽  
Yukawa Couplings ◽  
Left Handed ◽  
Matter Model ◽  
Relic Abundance ◽  
Dark Matter Model

Abstract We explore a novel possibility that dark matter has a light mass below 1 GeV in a lepton portal dark matter model. There are Yukawa couplings involving dark matter, left-handed leptons and an extra scalar doublet in the model. In the light mass region, dark matter is thermally produced via its annihilation into neutrinos. In order to obtain the correct relic abundance and avoid collider bounds, a neutral scalar is required to be light while charged scalars need to be heavier than the electroweak scale. Such a mass spectrum is realized by adjusting quartic couplings in the scalar potential or introducing an extra singlet scalar. It turns out that the mass region of 10 MeV–10 GeV is almost free from experimental and observational constraints. We also point out that searches for extra neutrino flux from galactic dark matter annihilations with neutrino telescopes are the best way to test our model.

scholarly journals LARGE SOLAR NEUTRINO MIXING IN AN EXTENDED ZEE MODEL

2002 ◽  
Vol 17 (19) ◽  
pp. 2519-2533 ◽  
Author(s):  
TERUYUKI KITABAYASHI ◽  
MASAYAKI YASUÈ
Keyword(s):  
Solar Neutrino ◽  
Electron Mass ◽  
Neutrino Mixing ◽  
Charged Scalar ◽  
Seesaw Mechanism ◽  
Left Handed ◽  
Mass Terms ◽  
Charged Leptons ◽  
Singly Charged ◽  
Higgs Scalar

The Zee model, which employs the standard Higgs scalar (ϕ) with its duplicate (ϕ ′) and a singly charged scalar (h+), can utilize two global symmetries associated with the conservation of the numbers of ϕ and ϕ′, Nϕ, ϕ′, where Nϕ + Nϕ′ coincides with the hypercharge while Nϕ - Nϕ′ (≡ X) is a new conserved charge, which is identical to Le - Lμ - Lτ for the left-handed leptons. Charged leptons turn out to have e–μ and e–τ mixing masses, which are found to be crucial for the large solar neutrino mixing. In an extended version of the Zee model with an extra triplet Higgs scalar (s), neutrino oscillations are described by three steps: (1) the maximal atmospheric mixing is induced by democratic mass terms supplied by s with X = 2 that can initiate the type II seesaw mechanism for the smallness of these masses; (2) the maximal solar neutrino mixing is triggered by the creation of radiative masses by h+ with X=0; (3) the large solar neutrino mixing is finally induced by a νμ - ντ mixing arising from the rotation of the radiative mass terms as a result of the diagonalization that converts e–μ and e–τ mixing masses into the electron mass.

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