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Closing the Wedge: Search Strategies for Extended Higgs Sectors with Heavy Flavor Final States
High Energy Physics - Phenomenology · Submitted 8 Feb 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find, in the $t\bar t H$ channel, with $H \rightarrow t \bar t$, that both single and 3 lepton final states can provide statistically significant constraints at low values of $\tan \beta$ for $m_A$ as high as $\sim 750$ GeV.
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The abstract, sentence by sentence
We consider search strategies for an extended Higgs sector at the high-luminosity LHC14 utilizing multi-top final states. In the framework of a Two Higgs Doublet Model, the purely top final states ($t\bar t, \, 4t$) are important channels for heavy Higgs bosons with masses in the wedge above $2\,m_t$ and at low values of $\tan\beta$, while a $2 b 2t$ final state is most relevant at moderate values of $\tan \beta$. We find, in the $t\bar t H$ channel, with $H \rightarrow t \bar t$, that both single and 3 lepton final states can provide statistically significant constraints at low values of $\tan \beta$ for $m_A$ as high as $\sim 750$ GeV. When systematics on the $t \bar t$ background are taken into account, however, the 3 lepton final state is more powerful, though the precise constraint depends fairly sensitively on lepton fake rates. We also find that neither $2b2t$ nor $t \bar t$ final states provide constraints on additional heavy Higgs bosons with couplings to tops smaller than the top Yukawa due to expected systematic uncertainties in the $t \bar t$ background.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We consider search strategies for an extended Higgs sector at the high-luminosity LHC14 utilizing multi-top final states. | contribution 0.94 | 0.55 | 0.04 | asserted 0.64 |
| s1 | In the framework of a Two Higgs Doublet Model, the purely top final states ($t\bar t, \, 4t$) are important channels for heavy Higgs bosons with masses in the wedge above $2\,m_t$ and at low values of $\tan\beta$, while a $2 b 2t$ final state is most relevant at moderate values of $\tan \beta$. | background 0.51 | 0.19 | 0.14 | asserted 1.00 |
| s2 | We find, in the $t\bar t H$ channel, with $H \rightarrow t \bar t$, that both single and 3 lepton final states can provide statistically significant constraints at low values of $\tan \beta$ for $m_A$ as high as $\sim 750$ GeV. | result 1.00 | 0.95 | 0.29 | asserted 1.00 |
| s3 | When systematics on the $t \bar t$ background are taken into account, however, the 3 lepton final state is more powerful, though the precise constraint depends fairly sensitively on lepton fake rates. | result 0.94 | 0.90 | 0.11 | asserted 1.00 |
| s4 | We also find that neither $2b2t$ nor $t \bar t$ final states provide constraints on additional heavy Higgs bosons with couplings to tops smaller than the top Yukawa due to expected systematic uncertainties in the $t \bar t$ background. | result 0.80 | 0.92 | 0.28 | asserted 1.00 |
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The paper
Original abstract
We consider search strategies for an extended Higgs sector at the high-luminosity LHC14 utilizing multi-top final states. In the framework of a Two Higgs Doublet Model, the purely top final states ($t\bar t, \, 4t$) are important channels for heavy Higgs bosons with masses in the wedge above $2\,m_t$ and at low values of $\tan\beta$, while a $2 b 2t$ final state is most relevant at moderate values of $\tan \beta$. We find, in the $t\bar t H$ channel, with $H \rightarrow t \bar t$, that both single and 3 lepton final states can provide statistically significant constraints at low values of $\tan \beta$ for $m_A$ as high as $\sim 750$ GeV. When systematics on the $t \bar t$ background are taken into account, however, the 3 lepton final state is more powerful, though the precise constraint depends fairly sensitively on lepton fake rates. We also find that neither $2b2t$ nor $t \bar t$ final states provide constraints on additional heavy Higgs bosons with couplings to tops smaller than the top Yukawa due to expected systematic uncertainties in the $t \bar t$ background.
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References
How the literature uses it
29 arXiv papers cite this in 49 sentences
Papers citing it · 33 sentences without a confident label
Compares with it 3 papers
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The constraints obtained in our work are complementary to and in many cases stronger than the exclusions that future LHC searches for the processes $pp →H/A →t t̅$, $pp →t t̅ H/A →t t̅ t t̅$ and $pp →b b̅ H/A →b b̅ t t̅$ are expected to be able to provide (cf. [ref] ) on 2HDMs with neutral Higgses with $M_H,A > 2 m_t$ and small values of $t_β$.
Searching for heavy Higgs bosons in the $t \bar t Z$ and $t b W$ final states · Conclusions · 1.00
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Which leads to results comparable to those derived in [ref] .
Heavy Higgs Bosons at Low $\tan \beta$: from the LHC to 100 TeV · Comparison between cut- and BDT-based approaches in $pp→Hbb$ · 0.98
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This is in contrast to direct $tt̅$ resonance searches, where the resonance width can play an important role (see e.g. [ref] ).
Four Tops for LHC · Application to new physics · 0.88
Cites it as support 2 papers
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In principle, a finite imaginary part of $ρ_tt$ can quite robustly drive EWBG [ref] , which motivates search for channels like $gg→H→t t̅$ or $gg→H t t̅→4t$ [ref] .
A Final Word on FCNC-Baryogenesis from Two Higgs Doublets · Model and parameter space · 0.99
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Interestingly, the direct search for new physics at the LHC can reach the parameter region that is favored by the excesses in the flavor physics [ref] .
Status of the semileptonic $B$ decays and muon g-2 in general 2HDMs with right-handed neutrinos · Summary · 0.96
Cites it as background 8 papers
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The gluon fusion channel displays sizable interference effects between the $s$-channel (pseudo)scalar induced top pair production (left diagram of <ref>) and the QCD top pair production (middle and right diagrams of <ref>) [ref] .
Resonant top pair searches at the LHC: a window to electroweak phase transition · Top Pair Resonant Searches via ggtoHAtott · 0.87
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Color neutral resonances decaying into $$ have been studied in several works for a large number of models [ref] , even including interference effects at NLO in QCD [ref] .
Constraining scalar resonances with top-quark pair production at the LHC · Results · 0.88
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There are only few existing proposals for beyond SM four-top searches [ref] and also some preliminary experimental reports [ref] in this direction.
Four Tops for LHC · Introduction · 0.82
What it cites · 53 sentences without a confident label
Uses the method or tool of 9 papers
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The top reconstruction method we utilize follows Ref. [ref] .
Searching for Top Flavor Violating Resonances · Top Reconstruction · 1.00
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We model signals and backgrounds using MadGraph5 [ref] , interfaced with Pythia 6.4 [ref] for parton showering.
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations · Heavy Higgs Signals in Heavy Flavor Final States at LHC14 · 1.00
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We model signals and backgrounds using MadGraph5 [ref] , interfaced with Pythia 6.4 [ref] for parton showering.
PYTHIA 6.4 Physics and Manual · Heavy Higgs Signals in Heavy Flavor Final States at LHC14 · 1.00
Uses data or values from 5 papers
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With these baseline cuts, the $tt̅$ background has a cross section at NLO of 1 nb, and the $W(Z) +$ jets cross section is 220 nb (70 nb).[We have included in the $tt̅+$ jets and in the $W(Z)$+jets cross sections a K-factor of 1.5 [ref] and 1.2 [ref] , respectively.] The $tt̅ Z$, $tt̅ W$ and 4 top background cross sections are much smaller: 1 pb [ref] , 770 fb [ref] , and 12 fb [ref] , respectively.
Constraining BSM Physics at the LHC: Four top final states with NLO accuracy in perturbative QCD · Heavy Higgs Signals in Heavy Flavor Final States at LHC14 · 0.93
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With these baseline cuts, the $tt̅$ background has a cross section at NLO of 1 nb, and the $W(Z) +$ jets cross section is 220 nb (70 nb).[We have included in the $tt̅+$ jets and in the $W(Z)$+jets cross sections a K-factor of 1.5 [ref] and 1.2 [ref] , respectively.] The $tt̅ Z$, $tt̅ W$ and 4 top background cross sections are much smaller: 1 pb [ref] , 770 fb [ref] , and 12 fb [ref] , respectively.
MCFM for the Tevatron and the LHC · Heavy Higgs Signals in Heavy Flavor Final States at LHC14 · 0.93
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With these baseline cuts, the $tt̅$ background has a cross section at NLO of 1 nb, and the $W(Z) +$ jets cross section is 220 nb (70 nb).[We have included in the $tt̅+$ jets and in the $W(Z)$+jets cross sections a K-factor of 1.5 [ref] and 1.2 [ref] , respectively.] The $tt̅ Z$, $tt̅ W$ and 4 top background cross sections are much smaller: 1 pb [ref] , 770 fb [ref] , and 12 fb [ref] , respectively.
t \bar{t} W production and decay at NLO · Heavy Higgs Signals in Heavy Flavor Final States at LHC14 · 0.93
Compares with 2 papers
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As a result of this analysis, we find a more significant reach than Ref. [ref] .
The Hunt for the Rest of the Higgs Bosons · Introduction · 0.96
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This is similar to what has been shown in Ref. [ref] , for the case of a one lepton and many jets signature (with no $b$-tag requirement).
Study of LHC Searches for a Lepton and Many Jets · Heavy Higgs Signals in Heavy Flavor Final States at LHC14 · 0.87
Cites as background 7 papers
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Previous studies have also focused on constraining heavy Higgs bosons through decays to top quarks at the LHC [ref] .
The Hunt for the Rest of the Higgs Bosons · Introduction · 0.96
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Previous studies have also focused on constraining heavy Higgs bosons through decays to top quarks at the LHC [ref] .
Heavy Higgs Bosons at 14 TeV and 100 TeV · Introduction · 0.96
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Refs. [ref] ).] In contrast to the above decay channels induced by tree-level couplings, both $A$ and $H$ couple to pairs of gluons and photons only via loops of colored/charged particle as does the SM-like Higgs.
Hierarchical vs Degenerate 2HDM: The LHC Run 1 Legacy at the Onset of Run 2 · Rates and Signatures from Aligned Heavy Higgs Bosons · 0.88
Discussion
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