scholarly journals Leaks of CP violation in the real two-Higgs-doublet model

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
Duarte Fontes ◽  
Maximilian Löschner ◽  
Jorge C. Romão ◽  
João P. Silva
Keyword(s):  
Cp Violation ◽  
State Of The Art ◽  
Higgs Doublet ◽  
Automatic Computation ◽  
The Real ◽  
Yukawa Couplings ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Breaking Term ◽  
Scalar Sector

AbstractWe discuss the $$Z_2$$ Z 2 symmetric two-Higgs-doublet model with a real soft-breaking term (real 2HDM). We explain in detail why it is not tenable to assume CP conservation in the scalar sector to keep the dimension two term real, while CP is violated by the dimension four Yukawa couplings. We propose the calculation of the infinite tadpole of the (would-be) pseudoscalar neutral scalar. We construct a simple toy model with the same flaws, where the unrenormalizable infinity is easier to calculate. We then consider the same tadpole in the real 2HDM. We spearhead this effort focusing on diagrams involving solely bare quantities. This involves hundreds of Feynman three-loop diagrams that could feed the CP violation from the quark into the scalar sector, and is only possible with state of the art automatic computation tools. Remarkably, some intermediate results agree when using three independent derivations, including the peculiar cancellation of the leading pole divergence due to a subtle interplay between masses and the Jarlskog invariant, which we calculate analytically. The calculation is not complete however, since the full two-loop renormalization of the real 2HDM is not yet available in the literature. Still, we argue convincingly that there is an irremovable infinity.

scholarly journals Explaining Atomki anomaly and muon g − 2 in U(1)X extended flavour violating two Higgs doublet model

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Takaaki Nomura ◽  
Prasenjit Sanyal
Keyword(s):  
Higgs Doublet ◽  
Scalar Boson ◽  
Parameter Region ◽  
Yukawa Couplings ◽  
Charge Assignment ◽  
Light Scalar ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Scalar Sector ◽  
Lepton Flavour

Abstract We investigate a two Higgs doublet model with extra flavour depending U(1)X gauge symmetry where Z′ boson interactions can explain the Atomki anomaly by choosing appropriate charge assignment for the SM fermions. For parameter region explaining the Atomki anomaly we obtain light scalar boson with $$ \mathcal{O} $$ O (10) GeV mass, and we explore scalar sector to search for allowed parameter space. We then discuss anomalous magnetic dipole moment of muon and lepton flavour violating processes induced by Yukawa couplings of our model.

scholarly journals Testing CP properties of extra Higgs states at the HL-LHC

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Stefan Antusch ◽  
Oliver Fischer ◽  
A. Hammad ◽  
Christiane Scherb
Keyword(s):  
Cp Violation ◽  
Higgs Doublet ◽  
Type I ◽  
Final States ◽  
Current Standard ◽  
Boosted Decision Tree ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Scalar Sector ◽  
Higgs State

Abstract Extra Higgs states appear in various scenarios beyond the current Standard Model of elementary particles. If discovered at the LHC or future colliders, the question will arise whether CP is violated or conserved in the extended scalar sector. An unambiguous probe of (indirect) CP violation would be the observation that one of the extra Higgs particles is an admixture of a CP-even and a CP-odd state. We discuss the possibility to discover scalar CP violation in this way at the high-luminosity (HL) phase of the LHC. We focus on the Two-Higgs Doublet Model of type I, where we investigate its currently allowed parameter region. Considering a benchmark point that is compatible with the current constraints but within reach of the HL-LHC, we study the prospects of determining the CP property of an extra neutral Higgs state H via the angular distribution of final states in the decay H→$$ \tau \overline{\tau} $$ τ τ ¯ . The analysis is performed at the reconstructed level, making use of a Boosted Decision Tree for efficient signal-background separation and a shape analysis for rejecting a purely CP-even or odd nature of H.

scholarly journals THE RADIATIVE h0(A0)→γγ DECAYS IN THE TWO-HIGGS DOUBLET MODEL

2004 ◽  
Vol 19 (29) ◽  
pp. 2215-2225 ◽  
Author(s):  
E. O. ILTAN
Keyword(s):  
Cp Violation ◽  
Decay Width ◽  
Higgs Doublet ◽  
Complex Nature ◽  
Yukawa Couplings ◽  
Two Photon ◽  
Comprehensive Information ◽  
Order Of Magnitude ◽  
Doublet Model ◽  
Two Higgs Doublet Model

We study the radiative h0(A0)→γγ decays in the framework of the general two-Higgs doublet model, the so-called model III. We estimate the decay width of the processes at the order of magnitude of 10-2 GeV for the intermediate values of the Yukawa couplings. We observe that the analysis of the two-photon system provides a comprehensive information for the complex nature of the Yukawa couplings and therefore, the source of the CP violation.

mixing, CP violation, and B→KγX in a two-Higgs-doublet model

1990 ◽  
Vol 337 (2) ◽  
pp. 284-312 ◽  
Author(s):  
Andrzej J. Buras ◽  
Paweł Krawczyk ◽  
Markus E. Lautenbacher ◽  
Claudia Salazar
Keyword(s):  
Cp Violation ◽  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals Consistency of a gauged two-Higgs-doublet model: Scalar sector

2018 ◽  
Vol 98 (9) ◽  
Author(s):  
Abdesslam Arhrib ◽  
Wei-Chih Huang ◽  
Raymundo Ramos ◽  
Yue-Lin Sming Tsai ◽  
Tzu-Chiang Yuan
Keyword(s):  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Scalar Sector

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 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).

scholarly journals STUDY OF CP VIOLATION IN $\Lambda_c^+$ DECAY

2011 ◽  
Vol 26 (15) ◽  
pp. 2523-2535 ◽  
Author(s):  
XIAN-WEI KANG ◽  
HAI-BO LI ◽  
GONG-RU LU ◽  
ALAKABHA DATTA
Keyword(s):  
Angular Distribution ◽  
Cp Violation ◽  
Vector Meson ◽  
Higgs Doublet ◽  
New Physics ◽  
Angular Analysis ◽  
The Standard Model ◽  
Helicity Amplitudes ◽  
Doublet Model ◽  
Two Higgs Doublet Model

In this paper, we study CP violation in [Formula: see text] and [Formula: see text] decays, where B, P and V denote a light spin-½ baryon, pseudoscalar and a vector meson respectively. In these processes the T odd CP violating triple-product (TP) correlations are examined. The genuine CP violating observables which are composed of the helicity amplitudes occurring in the angular distribution are constructed. Experimentally, by performing a full angular analysis it is shown how one may extract the helicity amplitudes and then obtain the TP asymmetries. We estimate the TP asymmetries in [Formula: see text] decays to be negligible in the Standard Model making these processes an excellent place to look for new physics. Taking a two-Higgs doublet model, as an example of new physics, we show that large TP asymmetries are possible in these decays. Finally, we discuss how BES-III and super τ-charm experiments will be sensitive to these CP violating signals in [Formula: see text] decays.

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