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Restricting the parameter space of Type-II Two Higgs Doublet Models with CP violation
High Energy Physics - Phenomenology · Submitted 28 Dec 2021
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Imposing theory-motivated and experimentally-driven constraints, we show that as the CP-violating phases are increased, only small regions of parameter space survive, including regions slightly away from the alignment limit.
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The abstract, sentence by sentence
We explore the parameter space of the type-II two-Higgs-doublet model with softly broken Z2 symmetry, allowing for CP violation in the scalar potential. Imposing theory-motivated and experimentally-driven constraints, we show that as the CP-violating phases are increased, only small regions of parameter space survive, including regions slightly away from the alignment limit. Electroweak oblique parameters and electric dipole moments emerge as most restrictive constraints. We show that imposing these constraints (as well as theoretical bounds such as perturbativity) the masses of the charged and heavy neutral Higgs, unlike in the CP conserving case, are bound from above and below. In particular, the heavy neutral Higgs masses are almost degenerate. In this parameter space region we highlight the relevant decay signals of the heavy neutral Higgs, involving both Zh and WW=ZZ, indicative of CP violation in the model.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We explore the parameter space of the type-II two-Higgs-doublet model with softly broken Z2 symmetry, allowing for CP violation in the scalar potential. | contribution 0.89 | 0.80 | 0.04 | asserted 0.82 |
| s1 | Imposing theory-motivated and experimentally-driven constraints, we show that as the CP-violating phases are increased, only small regions of parameter space survive, including regions slightly away from the alignment limit. | result 0.98 | 0.94 | 0.59 | asserted 1.00 |
| s2 | Electroweak oblique parameters and electric dipole moments emerge as most restrictive constraints. | result 0.97 | 0.77 | 0.12 | asserted 1.00 |
| s3 | We show that imposing these constraints (as well as theoretical bounds such as perturbativity) the masses of the charged and heavy neutral Higgs, unlike in the CP conserving case, are bound from above and below. | result 1.00 | 0.94 | 0.35 | asserted 1.00 |
| s4 | In particular, the heavy neutral Higgs masses are almost degenerate. | result 1.00 | 0.86 | 0.11 | asserted 0.99 |
| s5 | In this parameter space region we highlight the relevant decay signals of the heavy neutral Higgs, involving both Zh and WW=ZZ, indicative of CP violation in the model. | result 0.66 | 0.86 | 0.11 | asserted 0.75 |
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The paper
Original abstract
We explore the parameter space of the type-II two-Higgs-doublet model with softly broken Z2 symmetry, allowing for CP violation in the scalar potential. Imposing theory-motivated and experimentally-driven constraints, we show that as the CP-violating phases are increased, only small regions of parameter space survive, including regions slightly away from the alignment limit. Electroweak oblique parameters and electric dipole moments emerge as most restrictive constraints. We show that imposing these constraints (as well as theoretical bounds such as perturbativity) the masses of the charged and heavy neutral Higgs, unlike in the CP conserving case, are bound from above and below. In particular, the heavy neutral Higgs masses are almost degenerate. In this parameter space region we highlight the relevant decay signals of the heavy neutral Higgs, involving both Zh and WW=ZZ, indicative of CP violation in the model.
Human review
How the literature uses it
1 arXiv paper cite this in 2 sentences
Papers citing it · 1 sentence without a confident label
Cites it as background 1 paper
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A substantial body of phenomenological studies has already explored these possibilities, focusing on collider observables across a variety of benchmark channels [ref] .
Intrinsic Properties of Large CP Violation in the Complex Two-Higgs-Doublet Model · Introduction · 0.94
What it cites · 54 sentences without a confident label
Uses the method or tool of 8 papers
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In order to properly combine the constraints coming from the LHC-Higgs data, we used Lilith [ref] .
Constraining new physics from Higgs measurements with Lilith-2 · SM Higgs data · 1.00
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In order to properly combine the constraints coming from the LHC-Higgs data, we used Lilith [ref] .
Lilith: a tool for constraining new physics from Higgs measurements · SM Higgs data · 1.00
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In our numerical evaluation, the production cross sections via gluon fusion are calculated at NLO using SusHiv1.6.0 [ref] and interfaced with ScannerS [ref] .
ScannerS: Parameter Scans in Extended Scalar Sectors · Neutral Higgs Bosons Production · 1.00
Uses data or values from 8 papers
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This theoretical constraint comes from the oblique parameters, constrained by the global fit [ref] to be [equation]
The Electroweak Fit of the Standard Model after the Discovery of a New Boson at the LHC · S, T, U parameters · 0.93
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This theoretical constraint comes from the oblique parameters, constrained by the global fit [ref] to be [equation]
Flavor constraints on the Two Higgs Doublet Models of $Z_2$ symmetric and aligned types · S, T, U parameters · 0.93
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We show contours for the signal strengths of the Higgs channels $gg→h →ZZ$ (red-thick), $Vh →(h→bb̅)$ (green-light) and $gg→h →γγ$ (black-thin), using the bounds set by ATLAS, with 36 fb$^-1$ (dashed/dot-dashed/dotted) and with 139 fb$^-1$ (solid) of integrated luminosity [ref] .
Constraints on Higgs boson production with large transverse momentum using $H\rightarrow b\bar{b}$ decays in the ATLAS detector · Allowed Parameter Space · 0.90
Cites as support 1 paper
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It has also been shown that, in unlike in the Type-I 2HDM, the electron and mercury EDMs are not able to probe the parameter space when $tanβ$ is close to 1, which will be our case, due to the cancellation in Barr-Zee diagrams [ref] .
CP-Violation in the Two Higgs Doublet Model: from the LHC to EDMs · Electric Dipole Moments · 0.99
Cites as background 35 papers
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the impact of CP violation on the Higgs bosons and their respective decay channels, we consider the CPV 2HDM potential parameters [ref] in the approximate $Z_2$ case [ref] .
Complementarity of LHC and EDMs for Exploring Higgs CP Violation · Introduction and Motivation · 0.90
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the impact of CP violation on the Higgs bosons and their respective decay channels, we consider the CPV 2HDM potential parameters [ref] in the approximate $Z_2$ case [ref] .
Constraining new physics from Higgs measurements with Lilith: update to LHC Run 2 results · Introduction and Motivation · 0.90
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The implication of electroweak precision on the mass spectrum of heavier neutral and on the charged Higgs was thoroughly investigated before [ref] , in the context of CPV 2HDM.
What the Oblique Parameters S, T, and U and Their Extensions Reveal About the 2HDM: A Numerical Analysis · S, T, U parameters · 0.88
Discussion
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