scholarly journals Renormalization of the C2HDM with FeynMaster 2

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Duarte Fontes ◽  
Jorge C. Romão
Keyword(s):  
Cp Violation ◽  
Higgs Doublet ◽  
Physical Parameters ◽  
Feynman Rules ◽  
Ideal Tool ◽  
Doublet Model ◽  
The One ◽  
Scalar Sector

Abstract We present the one-loop electroweak renormalization of the CP-violating 2-Higgs-Doublet Model with softly broken ℤ2 symmetry (C2HDM). The existence of CP violation in the scalar sector of the model leads to a quite unique process of renormalization, since it requires the introduction of several non-physical parameters. The C2HDM will thus have more independent counterterms than independent renormalized parameters. As a consequence, different combinations of counterterms can be taken as independent for the same set of independent renormalized parameters. We compare the behaviour of selected combinations in specific NLO processes, which are assured to be gauge independent via a simple prescription. FeynMaster 2 is used to derive the Feynman rules, counterterms and one-loop processes in a simultaneously automatic and flexible way. This illustrates its use as an ideal tool to renormalize models such as the C2HDM and investigate them at NLO.

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 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 Interplay of New Physics effects in (g − 2)ℓ and h → ℓ+ℓ− — lessons from SMEFT

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Svjetlana Fajfer ◽  
Jernej F. Kamenik ◽  
M. Tammaro
Keyword(s):  
Closed Operator ◽  
Higgs Doublet ◽  
New Physics ◽  
Effective Field ◽  
Tree Level ◽  
Electroweak Symmetry ◽  
Scalar Leptoquark ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model

Abstract We explore the interplay of New Physics (NP) effects in (g− 2)ℓ and h→ℓ+ℓ− within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and SU(2)L gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the (g−2)ℓ and h→ℓ+ℓ− contributions obtained by the complete one- and even two-loop calculations in the full models.

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

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 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

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.

FCNI suppression and CP violation in a two-Higgs-doublet model

1994 ◽  
Vol 20 (8) ◽  
pp. 1159-1168 ◽  
Author(s):  
L Epele ◽  
H Fanchiotti ◽  
C Garcia Canal ◽  
D Gomez Dumm
Keyword(s):  
Cp Violation ◽  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model
Sign in / Sign up

Export Citation Format

Share Document