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Rare Z-decay into light CP-odd Higgs bosons: a comparative study in different new physics models
High Energy Physics - Phenomenology · Submitted 12 Jul 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that in the parameter space allowed by current experiments, the branching ratios can reach $10^{-4}$ for $Z \to \bar{f} f a $ ($f=b,\tau$), $10^{-9}$ for $Z\to a\gamma$ and $10^{-3}$ for $Z\to aaa$, which implies that the decays $Z \to \bar{f} f a$ and $Z \to a a a$ may be accessible at the GigaZ option.
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The abstract, sentence by sentence
Various new physics models predict a light CP-odd Higgs boson (labeled as $a$) and open up new decay modes for Z-boson, such as $Z \to \bar{f} f a$, $Z\to a\gamma$ and $Z\to aaa$, which could be explored at the GigaZ option of the ILC. In this work we investigate these rare decays in several new physics models, namely the type-II two Higgs doublet model (type-II 2HDM), the lepton-specific two Higgs doublet model (L2HDM), the nearly minimal supersymetric standard model (nMSSM) and the next-to-minimal supersymmetric standard model (NMSSM). We find that in the parameter space allowed by current experiments, the branching ratios can reach $10^{-4}$ for $Z \to \bar{f} f a $ ($f=b,\tau$), $10^{-9}$ for $Z\to a\gamma$ and $10^{-3}$ for $Z\to aaa$, which implies that the decays $Z \to \bar{f} f a$ and $Z \to a a a$ may be accessible at the GigaZ option. Moreover, since different models predict different patterns of the branching ratios, the measurement of these rare decays at the GigaZ may be utilized to distinguish the models.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Various new physics models predict a light CP-odd Higgs boson (labeled as $a$) and open up new decay modes for Z-boson, such as $Z \to \bar{f} f a$, $Z\to a\gamma$ and $Z\to aaa$, which could be explored at the GigaZ option of the ILC. | background 1.00 | 0.05 | 0.05 | hedged possibility 0.80 |
| s1 | In this work we investigate these rare decays in several new physics models, namely the type-II two Higgs doublet model (type-II 2HDM), the lepton-specific two Higgs doublet model (L2HDM), the nearly minimal supersymetric standard model (nMSSM) and the next-to-minimal supersymmetric standard model (NMSSM). | contribution 0.90 | 0.54 | 0.03 | asserted 0.94 |
| s2 | We find that in the parameter space allowed by current experiments, the branching ratios can reach $10^{-4}$ for $Z \to \bar{f} f a $ ($f=b,\tau$), $10^{-9}$ for $Z\to a\gamma$ and $10^{-3}$ for $Z\to aaa$, which implies that the decays $Z \to \bar{f} f a$ and $Z \to a a a$ may be accessible at the GigaZ option. | result 0.99 | 0.95 | 0.74 | asserted 0.89 |
| s3 | Moreover, since different models predict different patterns of the branching ratios, the measurement of these rare decays at the GigaZ may be utilized to distinguish the models. | interpretation 0.99 | 0.37 | 0.28 | hedged possibility 0.97 |
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The paper
Original abstract
Various new physics models predict a light CP-odd Higgs boson (labeled as $a$) and open up new decay modes for Z-boson, such as $Z \to \bar{f} f a$, $Z\to a\gamma$ and $Z\to aaa$, which could be explored at the GigaZ option of the ILC. In this work we investigate these rare decays in several new physics models, namely the type-II two Higgs doublet model (type-II 2HDM), the lepton-specific two Higgs doublet model (L2HDM), the nearly minimal supersymetric standard model (nMSSM) and the next-to-minimal supersymmetric standard model (NMSSM). We find that in the parameter space allowed by current experiments, the branching ratios can reach $10^{-4}$ for $Z \to \bar{f} f a $ ($f=b,\tau$), $10^{-9}$ for $Z\to a\gamma$ and $10^{-3}$ for $Z\to aaa$, which implies that the decays $Z \to \bar{f} f a$ and $Z \to a a a$ may be accessible at the GigaZ option. Moreover, since different models predict different patterns of the branching ratios, the measurement of these rare decays at the GigaZ may be utilized to distinguish the models.
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How the literature uses it
7 arXiv papers cite this in 12 sentences
Papers citing it · 6 sentences without a confident label
Cites it as background 4 papers
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The decay $Z →ϕγ$ was studied in the extensions of the SM including Minimal Supersymmetric Standard Model (MSSM) [ref] .
Testing $Z$ boson rare decays $Z\to H_1 \gamma, A_1 \gamma$ with $(g-2)_\mu$, $M_W$, and $BR(h_{\rm SM}\to Z\gamma)$ in the NMSSM · Introduction · 0.86
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There have been previous work on constraining dark sector related new physics from Z properties at future $e^+e^-$ colliders, including dark photon [ref] , sterile neutrino model [ref] , Z invisible width e.g. [ref] , rare SM Z decays [ref] , light CP-odd Higgs bosons and supersymmetric models [ref] , .
Exposing Dark Sector with Future Z-Factories · Introduction · 0.99
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Studies have investigated the discovery potential of future lepton colliders for a variety of new physics and SM scenarios related to $Z-$properties [ref] .
Long-lived light neutralinos at future $Z-$factories · Introduction · 0.95
What it cites · 10 sentences without a confident label
Uses data or values from 3 papers
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We compute the signals from the Higgs-strahlung production $e^+ e^- →Z h_i$ ($i= 1, 2$) with $h_i →2 b, 2 τ, 4 b, 4 τ, 2 b 2 τ$ [ref] and from the associated production $e^+ e^- →h_i a$ with $h_i a →4 b, 4 τ, 2 b 2 τ, 6 b, 6 τ$ [ref] , and compare them with the corresponding LEP data which have been inputted into our code.
Search for neutral Higgs bosons decaying into four taus at LEP2 · Constraints on the new physics models · 0.90
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In this work, we use the results of Fig.11 in [ref] to exclude the unfavored points.
The Two Higgs Doublet of Type II facing flavour physics data · Constraints on the new physics models · 0.98
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(c) Dark matter constraints from the WMAP relic density 0.0975 $< Ωh^2 <$ 0.1213 [ref] .
Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data · Constraints on the new physics models · 0.95
Cites as background 1 paper
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Since for a light $a$, its doublet component, parameterized by $sinθ_A$ in Eq.([ref]), is usually small, the couplings of $a$ with the sparticles will never be tremendously large [ref] .
The Next-to-Minimal Supersymmetric Standard Model · CALCULATIONS · 0.81
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