scholarly journals THE DECAY b→sγ IN THE 3–3–1 MODEL

1996 ◽  
Vol 11 (13) ◽  
pp. 2263-2280 ◽  
Author(s):  
JYOTI AGRAWAL ◽  
PAUL H. FRAMPTON ◽  
JAMES T. LIU
Keyword(s):  
Decay Rate ◽  
Higgs Mass ◽  
Higgs Doublet ◽  
The Other ◽  
Anomaly Cancellation ◽  
The Third ◽  
Flavor Changing ◽  
Charged Higgs ◽  
Doublet Model ◽  
Two Higgs Doublet Model

The 3–3–1 model, based on the gauge group SU (3)c× SU (3)L× U (1)X, makes a natural prediction of three generations based on anomaly cancellation. Since this is accomplished by incorporating the third family of quarks differently from the other two, it leads to potentially large flavor-changing neutral currents. A sensitive place to look for such effects is the flavor-changing b→sγ decay, which has recently been measured at CLEO. We compute this decay rate in the 3–3–1 model and compare it with that of the two-Higgs-doublet model, a subset of the full 3–3–1 model. We find that the additional 3–3–1 physics weakens the bound on the charged Higgs mass from MH+>290 GeV to MH+≳120 GeV .

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.

$B^0 - \bar B^0 $ MIXING IN A SUPERSYMMETRY-INSPIRED TWO HIGGS DOUBLET MODEL

1988 ◽  
Vol 03 (11) ◽  
pp. 1099-1105 ◽  
Author(s):  
AMITAVA RAYCHAUDHURI ◽  
SREERUP RAYCHAUDHURI
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Higgs Mass ◽  
Vacuum Expectation ◽  
Higgs Doublet ◽  
Top Quark Mass ◽  
Expectation Values ◽  
Charged Higgs ◽  
Doublet Model ◽  
Two Higgs Doublet Model

A supersymmetry-motivated two Higgs doublet model with equal vacuum expectation values for the two neutral Higgs and with a physical charged Higgs mass of 80–100 GeV is carefully examined in the context of its implications for [Formula: see text] mixing. Even with this conservative choice of Higgs parameters, the lower bound on the top quark mass coming from the ARGUS data is found to be considerably relaxed. An upper bound is also set, using results from CLEO and Mark II.

scholarly journals Observability of triple or double charged Higgs production in two Higgs doublet model type II at an e+e- linear collider

2015 ◽  
Vol 30 (04n05) ◽  
pp. 1550022 ◽  
Author(s):  
M. Hashemi ◽  
I. Ahmed
Keyword(s):  
Higgs Mass ◽  
Linear Collider ◽  
Higgs Doublet ◽  
Type Ii ◽  
Higgs Decay ◽  
Charged Higgs ◽  
Signal Significance ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Higgs Signal

In this paper the charged Higgs signal through triple or double Higgs production in a two Higgs doublet model (2HDM) type II is studied. The main production process is e+e- →H+H-H0 followed by the charged Higgs decay to a pair of τν and the neutral Higgs decay to [Formula: see text]. The alternative process H+W-H0 is also included as a source of charged Higgs signal in the analysis. The focus is on a future e+e- linear collider operating at [Formula: see text]. The final state under consideration [Formula: see text] is suitable for electroweak background rejection using the b-tagging tools. It is shown that although the signal cross-section is small, with a reasonable background suppression, high signal significance values are achievable at an integrated luminosity 500 fb-1 depending on the charged Higgs mass, tan β and the CP-odd neutral Higgs mass. Finally results are quoted in terms of the signal significance for charged Higgs in the mass range 160 < mH± < 400 GeV .

scholarly journals NATURALNESS IN A SIMPLE TWO HIGGS DOUBLET MODEL

2013 ◽  
Vol 28 (12) ◽  
pp. 1350036 ◽  
Author(s):  
RENATA JORA ◽  
SALAH NASRI ◽  
JOSEPH SCHECHTER
Keyword(s):  
Parameter Space ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
The Other ◽  
Fine Tuning ◽  
Charged Higgs ◽  
Doublet Model ◽  
Charged Higgs Bosons ◽  
Two Higgs Doublet Model

We study the implications of a criterion of naturalness for a simple two Higgs doublet model in the context of the discovery of a Higgs-like particle with a mass at 125 GeV. This condition which measures the amount of fine-tuning further limits the parameter space of this particular model and together with other phenomenological constraints lead to an allowed range of masses for the other neutral or charged Higgs bosons: H, a±, a0.

scholarly journals A final word on FCNC-Baryogenesis from two Higgs doublets

2021 ◽  
Vol 10 (6) ◽  
Author(s):  
Wei-Shu Hou ◽  
Tanmoy Modak ◽  
Tilman Plehn
Keyword(s):  
Higgs Doublet ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
Final Word ◽  
Flavor Changing ◽  
The Standard Model ◽  
Charged Higgs ◽  
General Search ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Electroweak baryogenesis in a two-Higgs doublet model is a well-motivated and testable scenario for physics beyond the Standard Model. An attractive way of providing CP violation is through flavor-changing Higgs couplings, where the top-charm coupling is hardly constrained. This minimal scenario can be tested by searching for heavy charged and neutral Higgs bosons at the LHC. While the charged Higgs signature requires a dedicated analysis, the neutral Higgs signature will be covered by a general search for same-sign top pairs. Together, they provide a conclusive test of this kind of baryogenesis.

scholarly journals b→sγ AND εb CONSTRAINTS ON TWO-HIGGS DOUBLET MODEL

1994 ◽  
Vol 09 (04) ◽  
pp. 321-326 ◽  
Author(s):  
GYE T. PARK
Keyword(s):  
Higgs Sector ◽  
Higgs Doublet ◽  
The Other ◽  
Combined Analysis ◽  
Vertex Corrections ◽  
Charged Higgs ◽  
Doublet Model ◽  
Two Higgs Doublet Model

We perform a combined analysis of two stringent constraints on the two-Higgs doublet model, one coming from the recently announced CLEO II bound on B (b→sγ) and the other from the recent LEP data on εb. We have included one-loop vertex corrections to [Formula: see text] through εb in the model. We find that the new εb constraint excludes most of the less appealing window tan β≲1 at 90% C.L. for mt=150 GeV. We also find that although b→sγ constraint is stronger for tan β>1, εb constraint is stronger for tan β≲1, and therefore these two are the strongest and complimentary constraints present in the charged Higgs sector of the model.

ONE LOOP-INDUCED WZH COUPLING IN THE TWO HIGGS DOUBLET MODEL

1989 ◽  
Vol 04 (28) ◽  
pp. 2757-2766 ◽  
Author(s):  
THOMAS G. RIZZO
Keyword(s):  
Standard Model ◽  
Higgs Doublet ◽  
New Physics ◽  
Tree Level ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Charged Higgs ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model

Although absent at the tree level in models with only doublet and singlet Higgs representations, the WZH coupling can be induced at the one-loop level. We examine the size of this induced coupling in the two Higgs doublet model due to fermion as well as Higgs/gauge boson loops. Such couplings could provide a new mechanism for charged Higgs production at colliders and are ‘backgrounds’ to new physics beyond the Standard Model. We find, however, that these couplings are very weak for all regions of the parameter space explored.

scholarly journals IMPLICATIONS OF THE RECENT TOP QUARK DISCOVERY ON TWO-HIGGS DOUBLET MODEL

1995 ◽  
Vol 10 (12) ◽  
pp. 967-972 ◽  
Author(s):  
GYE T. PARK
Keyword(s):  
Top Quark ◽  
Branching Ratio ◽  
Higgs Doublet ◽  
Recent Measurement ◽  
Model Predictions ◽  
Charged Higgs ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
The Impact ◽  
Top Mass

Concentrating on the impact of the very recent top quark discovery, we perform a combined analysis of two strongest constraints on the two-Higgs doublet model, one coming from the recent measurement by CLEO on the inclusive branching ratio of b→sγ decay and the other from the recent LEP data on [Formula: see text] decay. We have included the model predictions for one-loop vertex corrections to [Formula: see text] through εb. We find that the εb constraint excludes most of the less appealing window: tan β≲1 at 95% C.L. for the measured top mass mt=176±8±10 GeV from CDF. Moreover, it excludes tan β≲2 at 95% C.L. for mt≳176 GeV; combined with the b→sγ constraint, only very heavy charged Higgs (≳670 GeV) is allowed by the measured mt from CDF.

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