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

Antusch, Stefan; Fischer, Oliver; Hammad, A.; Scherb, Christiane

doi:10.1007/jhep03(2021)200

Cited by 11 publications

(9 citation statements)

References 61 publications

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“…The parameters m 2 ii , λ i =5 are real. The possible complex phases that allow for CP violation belong to the two parameters m 2 12 = |m 2 12 |e iη(m 2 12 ) and λ 5 = |λ 5 |e iη(λ 5 ) [30,31]. The tadpole equations impose a relation between the two complex phases, such that the CP violation can be parametrised ultimately via the parameter η(λ 5 ), the complex phase of λ 5 .…”

Section: The Modelmentioning

confidence: 99%

Exploration of Parameter Spaces Assisted by Machine Learning

Hammad¹,

Park²,

Ramos³

et al. 2022

Preprint

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We demonstrate two sampling procedures assisted by machine learning models via regression and classification. The objective is the construction of routines that can be employed for different types of analysis, from finding bounds on the parameter space to accumulating samples in areas of interest. Moreover, for classification, we introduce a boosting technique to improve cases where the initial convergence is slow. The type of results that can be obtained is better explained with the help of a few examples from sampling simple toy models to exploring the parameter space of the two Higgs doublet model. The code used for this paper and instructions are publicly available on the web 1 .

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Section: The Modelmentioning

confidence: 99%

Exploration of Parameter Spaces Assisted by Machine Learning

Hammad¹,

Park²,

Ramos³

et al. 2022

Preprint

Self Cite

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“…Recently, we studied a class of THDMs with CP violation in ref. [24], exploring the testability of CP violation at the LHC and evaluating the current constraints on the model parameters, pointing out the importance of the four-lepton final state as "discovery channel". We will make use of the results of [24] to find a viable set of model parameters that can match the current four-lepton excess.…”

Section: Jhep08(2022)224mentioning

confidence: 99%

Explaining excesses in four-leptons at the LHC with a double peak from a CP violating Two Higgs Doublet Model

Antusch

Fischer

Hammad

et al. 2022

J. High Energ. Phys.

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Extended scalar sectors with additional degrees of freedom appear in many scenarios beyond the Standard Model. Heavy scalar resonances that interact with the neutral current could be discovered via broad resonances in the tails of the four-lepton invariant mass spectrum, where the Standard Model background is small and well understood. In this article we consider a recent ATLAS measurement of four-lepton final states, where the data is in excess over the background for invariant masses above 500 GeV. We discuss the possibility that this excess could be interpreted as a “double peak” from the two extra heavy neutral scalars of a CP violating Two Higgs Doublet Model, both coupling to the Z boson. We apply an iterative fitting procedure to find viable model parameters that can match the excess, resulting in a benchmark point where the observed four-lepton invariant mass spectrum can be explained by two scalar particles H2 and H3, with masses of 544 GeV and 629 GeV, respectively, being admixtures of the CP eigenstates. Our explanation predicts additional production processes for $$ t\overline{t} $$ t t ¯ , W+W−, 4b and γγ, some of which have cross sections close to the current experimental limits. Our results further imply that the electric dipole moment of the electron should be close to the present bounds.

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“…2 Recently, in ref. [72], the effect of the CP-violating phase in the Higgs sector on the decay of the additional Higgs boson to a tau lepton pair has been discussed at the HL-LHC in the THDM with a softly broken Z 2 symmetry.…”

Section: Jhep04(2021)144mentioning

confidence: 99%

Testing aligned CP-violating Higgs sector at future lepton colliders

Kanemura

Kubota

Yagyu

2021

J. High Energ. Phys.

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We discuss the testability of CP-violating phases at future lepton colliders for the scenario which satisfies electric dipole moment data by destructive interferences among several phases. We consider the general but aligned two Higgs doublet model which has the CP-violating phases in the Higgs potential and the Yukawa interaction. The Yukawa interaction terms are aligned to avoid flavor changing neutral currents at tree level. The Higgs potential is also aligned such that the coupling constants of the lightest Higgs boson with the mass of 125 GeV to the Standard Model (SM) particles are the same as those of the SM at tree level. We investigate the azimuthal angle distribution of the hadronic decay of tau leptons arising from production and decay of the extra Higgs bosons, which contains information of the CP-violating phases. From the signal and background simulation, we find that the scenario with finite CP-violating phases can be distinguished from CP conserving one at future lepton colliders like the International Linear Collider.

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

Cited by 11 publications

References 61 publications

Exploration of Parameter Spaces Assisted by Machine Learning

Exploration of Parameter Spaces Assisted by Machine Learning

Explaining excesses in four-leptons at the LHC with a double peak from a CP violating Two Higgs Doublet Model

Testing aligned CP-violating Higgs sector at future lepton colliders

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