scholarly journals Yukawa sector of minimal SO(10) unification

2017 ◽  
Vol 2017 (2) ◽  
Author(s):  
K. S. Babu ◽  
Borut Bajc ◽  
Shaikh Saad
Keyword(s):  
Yukawa Sector

scholarly journals THE CURRENT PROBLEMS OF THE MINIMAL SO(10) GUT AND THEIR SOLUTIONS

2007 ◽  
Vol 16 (05) ◽  
pp. 1489-1503 ◽  
Author(s):  
TAKESHI FUKUYAMA ◽  
TATSURU KIKUCHI ◽  
NOBUCHIKA OKADA
Keyword(s):  
Predictive Power ◽  
Blow Up ◽  
Gauge Coupling ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Grand Unification ◽  
Warped Extra Dimension ◽  
Gut Scale ◽  
Gauge Couplings ◽  
Yukawa Sector

This talk consists of two parts. In part I we review how the minimal renormalizable supersymmetric SO (10) model, an SO (10) framework with only one 10 and one [Formula: see text] Higgs multiplets in the Yukawa sector, is attractive because of its highly predictive power. Indeed it not only gives a consistent predictions on neutrino oscillation data but also gives reasonable and interesting values for leptogenesis, LFV, muon g - 2, neutrinoless double beta decay etc. However, this model suffers from problems related to running of gauge couplings. The gauge coupling unification may be spoiled due to the presence of Higgs multiplets much lighter than the grand unification (GUT) scale. In addition, the gauge couplings blow up around the GUT scale because of the presence of Higgs multiplets of large representations. In part II we consider the minimal SO (10) model in the warped extra dimension and show a possibility to solve these problems.

scholarly journals OBSERVABLE LEPTON FLAVOR SYMMETRY AT LHC

2011 ◽  
Vol 26 (06) ◽  
pp. 377-385 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Finite Group ◽  
Large Hadron Collider ◽  
Gauge Boson ◽  
Charged Lepton ◽  
Hadron Collider ◽  
Flavor Symmetry ◽  
Final States ◽  
Lepton Flavor ◽  
Yukawa Sector

A model of lepton flavor symmetry is discussed, using the non-Abelian finite group T7 and the gauging of B-L, which has a residual Z3 symmetry in the charged-lepton Yukawa sector, allowing it to be observable at the Large Hadron Collider (LHC) from the decay of the new Z' gauge boson of this model to a pair of scalar bosons which have the unusual highly distinguishable final states τ- τ- μ+ e+.

scholarly journals CP SYMMETRY AND FERMION MASSES IN O(10) GRAND UNIFICATION MODELS

1996 ◽  
Vol 11 (34) ◽  
pp. 2703-2713 ◽  
Author(s):  
DAN-DI WU ◽  
YUE-LIANG WU
Keyword(s):  
Coupling Constants ◽  
Grand Unification ◽  
Global Symmetry ◽  
Mass Relation ◽  
Flavor Changing ◽  
Fermion Masses ◽  
Physical Representation ◽  
Cp Symmetry ◽  
Yukawa Sector ◽  
O 10

O(10) grand unification models which do not necessarily have an extra global symmetry are discussed, taking the model with one 10-plet in the Yukawa sector as an example. A strong correlation between mass ratios and CP is found. The mass relation mt/mb=vu/vd is recovered when GW=0; and another special relation mt/mb=GE/GW appears when vd=0, where GE,W are Yukawa coupling constants and vu,d are vevs. To facilitate this discussion, a set of O(10) γ-matrices is offered based on a physical representation of the spinors and that of the vector of the SO(10) group. Flavor changing neutral currents in such models are also discussed.

scholarly journals Yukawa sector for lepton flavor violating inh→μτandCPviolation inh→ττ

2016 ◽  
Vol 94 (7) ◽  
Author(s):  
Alper Hayreter ◽  
Xiao-Gang He ◽  
German Valencia
Keyword(s):  
Lepton Flavor ◽  
Yukawa Sector

scholarly journals Leptogenesis and fermion mass fit in a renormalizable SO(10) model

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
V. Suryanarayana Mummidi ◽  
Ketan M. Patel
Keyword(s):  
Numerical Solutions ◽  
Double Beta Decay ◽  
Fermion Mass ◽  
Strong Correlations ◽  
Yukawa Couplings ◽  
Mixing Parameters ◽  
Fermion Masses ◽  
The Standard Model ◽  
The Right ◽  
Yukawa Sector

Abstract A non-supersymmetric renormalizable SO(10) model is investigated for its viability in explaining the observed fermion masses and mixing parameters along with the baryon asymmetry produced via thermal leptogenesis. The Yukawa sector of the model consists of complex 10H and $$ {\overline{126}}_H $$ 126 ¯ H scalars with a Peccei-Quinn like symmetry and it leads to strong correlations among the Yukawa couplings of all the standard model fermions including the couplings and masses of the right-handed (RH) neutrinos. The latter implies the necessity to include the second lightest RH neutrino and flavor effects for the precision computation of leptogenesis. We use the most general density matrix equations to calculate the temperature evolution of flavoured leptonic asymmetry. A simplified analytical solution of these equations, applicable to the RH neutrino spectrum predicted in the model, is also obtained which allows one to fit the observed baryon to photon ratio along with the other fermion mass observables in a numerically efficient way. The analytical and numerical solutions are found to be in agreement within a factor of $$ \mathcal{O}(1) $$ O 1 . We find that the successful leptogenesis in this model does not prefer any particular value for leptonic Dirac and Majorana CP phases and the entire range of values of these observables is found to be consistent. The model specifically predicts (a) the lightest neutrino mass $$ {m}_{v_1} $$ m v 1 between 2–8 meV, (b) the effective mass of neutrinoless double beta decay mββ between 4–10 meV, and (c) a particular correlation between the Dirac and one of the Majorana CP phases.

scholarly journals B-anomalies in U(2) flavor symmetry

2020 ◽  
Vol 234 ◽  
pp. 01017
Author(s):  
Kei Yamamoto
Keyword(s):  
Standard Model ◽  
General Assumption ◽  
Flavor Symmetry ◽  
General Hypothesis ◽  
Lepton Flavor ◽  
The Standard Model ◽  
Future Data ◽  
Yukawa Sector ◽  
Dynamical Origin

We analyzed how to test flavor and helicity structures of the corresponding amplitudes in view of future data, motivated by the recent hints of lepton flavor universality violation observed in semileptonic B decays. The general assumption that non-standard effects are controlled by a U(2)5 flavor symmetry, minimally broken as in the Standard Model Yukawa sector, leads to stringent predictions on leptonic and semileptonic B decays. Future measurements will allow to prove or falsify this general hypothesis independently of its dynamical origin.

scholarly journals Twin Higgs with exact Z2

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Csaba Csáki ◽  
Cong-Sen Guan ◽  
Teng Ma ◽  
Jing Shu
Keyword(s):  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Quadratic Term ◽  
Higgs Potential ◽  
Electroweak Symmetry ◽  
Maximal Symmetry ◽  
Benchmark Model ◽  
Yukawa Couplings ◽  
Yukawa Sector

Abstract We present a novel mechanism for realistic electroweak symmetry breaking in Twin Higgs/neutral naturalness models where the Z2 exchange symmetry can remain exactly unbroken. The exchange symmetry in the Yukawa sector will be implemented as an “N-trigonometric parity” $$ \sin N\frac{h}{f}\leftrightarrow \cos N\frac{h}{f} $$ sin N h f ↔ cos N h f . The Yukawa couplings will be suppressed leading to an N-suppressed Higgs quadratic term, without significantly affecting the quartic. We present a concrete implementation of this idea for general (odd) values of N using maximal symmetry, and a realistic benchmark model for N = 3. We find that the tuning in the resulting Higgs potential is negligible, and also show that two-loop N-suppression violating gauge contributions can be sufficiently small. The Higgs potential and its couplings in top sector are different from other neutral naturalness models, which are the main predictions of our model and can be tested in colliders.

scholarly journals Constraining CP4 3HDM with Top Quark Decays

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 197
Author(s):  
Igor P. Ivanov ◽  
Semyon A. Obodenko
Keyword(s):  
Top Quark ◽  
Minimal Model ◽  
Higgs Doublet ◽  
Hadronic Decays ◽  
Quark Decays ◽  
Doublet Model ◽  
Almost All ◽  
Cp Symmetry ◽  
Yukawa Sector ◽  
Accidental Symmetry

CP4 3HDM is a unique three-Higgs-doublet model equipped with a higher-order CP-symmetry in the scalar and Yukawa sector. Based on a single assumption (the minimal model with a CP-symmetry of order 4 and no accidental symmetry), it leads to a remarkable correlation between its scalar and Yukawa sectors, which echoes in its phenomenology. A recent scan of the parameter space of CP4 3HDM under the assumption of scalar alignment identified a few dozens of points which passed many flavor constraints. In the present work, however, we show that almost all of these points are now ruled out by the recent LHC searches of t→H+b with subsequent hadronic decays of H+. Apart from a few points with charged Higgses heavier than the top quark, only one point survives all the checks, the model with an exotic, non-2HDM-like generation pattern of H+ couplings with quarks. One can expect many more points with exotic H+ couplings to quarks if the scalar alignment assumption is relaxed.

scholarly journals Flavor symmetries in the Yukawa sector of non-supersymmetric SO(10): numerical fits using renormalization group running

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Tommy Ohlsson ◽  
Marcus Pernow
Keyword(s):  
Renormalization Group ◽  
Mass Parameter ◽  
Double Beta Decay ◽  
Type I ◽  
Flavor Symmetries ◽  
Fitting Procedure ◽  
Mixing Parameters ◽  
Fermion Masses ◽  
Renormalization Group Equations ◽  
Yukawa Sector

Abstract We consider a class of SO(10) models with flavor symmetries in the Yukawa sector and investigate their viability by performing numerical fits to the fermion masses and mixing parameters. The fitting procedure involves a top-down approach in which we solve the renormalization group equations from the scale of grand unification down to the electroweak scale. This allows the intermediate scale right-handed neutrinos and scalar triplet, involved in the type I and II seesaw mechanisms, to be integrated out at their corresponding mass scales, leading to a correct renormalization group running. The result is that, of the 14 models considered, only two are able to fit the known data well. Both these two models correspond to ℤ2 symmetries. In addition to being able to fit the fermion masses and mixing parameters, they provide predictions for the sum of light neutrino masses and the effective neutrinoless double beta decay mass parameter, which are both within current observational bounds.

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