scholarly journals Flavor-changing neutral current in production and decay of pseudoscalar mesons in a type III two-Higgs-doublet-model with four-texture Yukawa couplings

2009 ◽  
Vol 80 (5) ◽  
Author(s):  
M. Gómez-Bock ◽  
G. López-Castro ◽  
L. López-Lozano ◽  
A. Rosado
Keyword(s):  
Neutral Current ◽  
Higgs Doublet ◽  
Yukawa Couplings ◽  
Type Iii ◽  
Flavor Changing ◽  
Pseudoscalar Mesons ◽  
Flavor Changing Neutral Current ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals Unitarity constraints for Yukawa couplings in the two-Higgs-doublet model type III

2014 ◽  
Vol 29 (18) ◽  
pp. 1450085
Author(s):  
Andrés Castillo ◽  
Rodolfo A. Diaz ◽  
Jhon Morales
Keyword(s):  
Higgs Sector ◽  
Higgs Doublet ◽  
Mixing Angles ◽  
Model Type ◽  
Yukawa Couplings ◽  
Type Iii ◽  
Flavor Changing ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Extended Higgs Sector

Unitarity constraints for Yukawa couplings are considered in the Two-Higgs-Doublet Model type III, by using a general expansion in partial waves for fermionic scattering processes. Constraints over general Flavor Changing Neutral Currents are found from that systematic, wherein such bounds compete with those coming from Lagrangian perturbativity requirement but are weaker than those imposed from phenomenological processes and precision tests. Nevertheless, for bounds based on unitarity, the number of assumptions is the lowest among phenomenological and theoretical limits. Indeed, these new theoretical constraints are independent of scalar masses or mixing angles for this extended Higgs sector, making them less model dependent.

scholarly journals SCALAR DARK MATTER EFFECTS IN HIGGS AND TOP QUARK DECAYS

2007 ◽  
Vol 22 (25n28) ◽  
pp. 2121-2129 ◽  
Author(s):  
XIAO-GANG HE ◽  
HO-CHIN TSAI ◽  
TONG LI ◽  
XUE-QIAN LI
Keyword(s):  
Dark Matter ◽  
Top Quark ◽  
Neutral Current ◽  
Higgs Doublet ◽  
Tree Level ◽  
Flavor Changing ◽  
Higgs Decay ◽  
Dark Matter Relic Density ◽  
Flavor Changing Neutral Current ◽  
Two Higgs Doublet Model

We study possible observational effects of scalar dark matter, the darkon D, in Higgs h and top quark t decay processes, h → DD and t → cDD in the minimal Standard Model (SM) and its two Higgs doublet model (THDM) extension supplemented with a SM singlet darkon scalar field D. We find that the darkon D can have a mass in the range of sub-GeV to several tens of GeV, interesting for LHC and ILC colliders, to produce the required dark matter relic density. In the SM with a darkon, t → cDD only occurs at loop level giving a very small rate, while the rate for Higgs decay h → DD can be large. In THDM III with a darkon, where tree level flavor changing neutral current (FCNC) interaction exists, a sizable rate for t → cDD is also possible.

Running of the Yukawa Couplings in a Two Higgs Doublet Model

2008 ◽  
Author(s):  
J. H. Montes de Oca Y. ◽  
S. R. Juárez W. ◽  
P. Kielanowski ◽  
Heriberto Castilla-Valdez ◽  
Omar Miranda ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Yukawa Couplings ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Electroweak unification of Yukawa Couplings in the Extension of the Two Higgs Doublet Model

2011 ◽  
Author(s):  
D. Morales C. ◽  
S. R. Juárez W. ◽  
P. Kielanowski ◽  
Alejandro Ayala ◽  
Guillermo Contreras ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Yukawa Couplings ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals CONSTRAINTS ON THE CHARGED HIGGS BOSON OF THE TWO-HIGGS DOUBLET MODEL TYPE III

2011 ◽  
Vol 26 (25) ◽  
pp. 1869-1879 ◽  
Author(s):  
H. CARDENAS ◽  
J. DUARTE ◽  
J. ALEXIS RODRIGUEZ
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Higgs Mass ◽  
Higgs Doublet ◽  
Charged Higgs Boson ◽  
Top Quark Mass ◽  
Type Iii ◽  
Charged Higgs ◽  
Doublet Model ◽  
Two Higgs Doublet Model

The D0 experiment has reported a direct search for a charged Higgs boson produced by [Formula: see text] annihilation and decaying to [Formula: see text] final state, in the 180≤MH+≤300 GeV mass range. The analysis has led to upper limits on the production cross-section in the framework of the two-Higgs doublet model types I, II and III. We compare the predictions of two different scenarios in the framework of the two-Higgs doublet type III to the cross-section limits reported by D0 collaboration, and we obtain constraints on the charged Higgs mass, for the case when the charged Higgs mass is bigger than the top quark mass. Also, searches for the charged Higgs boson with a mass smaller than top quark mass are considered, we discuss the possible limits on the charged Higgs boson mass obtained from measurements of the ratio [Formula: see text] within the two-Higgs doublet model type III.

scholarly journals SCALAR–PSEUDOSCALAR INTERACTIONS IN NEUTRINO–ELECTRON SCATTERING

2013 ◽  
Vol 28 (25) ◽  
pp. 1350124 ◽  
Author(s):  
R. GAITÁN ◽  
E. A. GARCES ◽  
O. G. MIRANDA ◽  
J. H. MONTES DE OCA Y
Keyword(s):  
Electron Scattering ◽  
Phenomenological Approach ◽  
Higgs Doublet ◽  
Charged Scalar ◽  
Yukawa Couplings ◽  
General Scalar ◽  
Pseudoscalar Coupling ◽  
Mixing Matrix ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Many extensions to the Standard Model imply the existence of new charged scalar Higgs bosons. We study the contribution of a general scalar or pseudoscalar coupling for the neutrino–electron scattering. We take a phenomenological approach in order to obtain model independent limits to the couplings that arise in this picture. We illustrate the reach of the constraints by studying the particular case of the type III two Higgs doublet model, where we have found new constraints to some elements of the Yukawa couplings mixing matrix (|Yee| ≤ 1 × 10-1 and |Yeμ| ≤ 7 × 10-2 at 90% CL).

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