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.

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 Probing heavy charged Higgs bosons through bottom flavored hadrons in the $$H^+\rightarrow \bar{b}t\rightarrow B+X$$ channel in 2HDM

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
S. Mohammad Moosavi Nejad ◽  
Pegah Sartipi Yarahmadi
Keyword(s):  
Top Quark ◽  
Hadron Collider ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
Higgs Decay ◽  
Charged Higgs ◽  
Doublet Model ◽  
Charged Higgs Bosons ◽  
Two Higgs Doublet Model

AbstractObserving light or heavy charged Higgs bosons $$H^\pm $$ H ± , lighter or heavier than the top quark, would be instant evidence of physics beyond the Standard Model. For this reason, in recent years searches for charged Higgs bosons have been in the center of attention of current colliders such as the CERN Large Hadron Collider (LHC). In spite of all efforts, no signal has been yet observed. Especially, the results of CMS and ATLAS experiments have excluded a large region in the MSSM $$m_{H^+}-\tan \beta $$ m H + - tan β parameter space for $$m_{H^+}=80{-}160$$ m H + = 80 - 160  GeV corresponding to the entire range of $$\tan \beta $$ tan β up to 60. Therefore, it seems that one should concentrate on probing heavy charged Higgs bosons ($$m_{H^\pm }>m_t$$ m H ± > m t ) so in this context each new probing channel is welcomed. In this work, we intend to present our proposed channel to search for heavy charged Higgses through the study of scaled-energy distribution of bottom-flavored mesons (B) inclusively produced in charged Higgs decay, i.e., $$H^+\rightarrow t\bar{b}\rightarrow B+X$$ H + → t b ¯ → B + X . Our study is carried out within the framework of the generic two Higgs doublet model (2HDM) using the massless scheme where the zero mass parton approximation is adopted for bottom quark.

MODELS OF CP VIOLATION EXCLUSIVELY VIA NEUTRAL-SCALAR EXCHANGE

1994 ◽  
Vol 09 (11) ◽  
pp. 1873-1888 ◽  
Author(s):  
L. LAVOURA
Keyword(s):  
Cp Violation ◽  
W Bosons ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Neutral Scalar ◽  
Charged Higgs ◽  
Doublet Model ◽  
Charged Higgs Bosons ◽  
Two Higgs Doublet Model

I suggest a two-Higgs-doublet model in which CP violation is mediated only by the neutral Higgs bosons, via the mechanism of scalar-pseudoscalar mixing. In this model there is no CP violation in the exchange of either W bosons or charged Higgs bosons. The model has only two basic CP-violating quantities. I remark that other models of this kind, but with more than two Higgs doublets, may also be built.

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 Higgs pair signal enhanced in the 2HDM with two degenerate 125 GeV Higgs bosons

2016 ◽  
Vol 31 (31) ◽  
pp. 1650178 ◽  
Author(s):  
Xiao-Fang Han ◽  
Lei Wang ◽  
Jin Min Yang
Keyword(s):  
Statistical Significance ◽  
Hadron Collider ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Signal Rate ◽  
The Standard Model ◽  
Detailed Simulation ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Text Signal

We discuss a scenario of the type-II two-Higgs-doublet model (2HDM) in which the [Formula: see text] rate of the Higgs pair production is enhanced due to the two nearly degenerate 125 GeV Higgs bosons (h, H). Considering various theoretical and experimental constraints, we figure out the allowed ranges of the trilinear couplings of these two Higgs bosons and calculate the signal rate of [Formula: see text] from the productions of Higgs pairs (hh, hH, HH) at the large hadron collider (LHC). We find that in the allowed parameter space some trilinear Higgs couplings can be larger than the Standard Model (SM) value by an order and the production rate of [Formula: see text] can be greatly enhanced. We also consider a “decoupling” benchmark point where the light CP-even Higgs has a SM-like cubic self-coupling while other trilinear couplings are very small. With a detailed simulation on the [Formula: see text] signal and backgrounds, we find that in such a “decoupling” scenario the hh and hH channels can jointly enhance the statistical significance to 5[Formula: see text] at 14 TeV LHC with an integrated luminosity of 3000 fb[Formula: see text].

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.

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