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Charged Higgs Search in 2HDM

T0 review · 2 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash

Pith's one-line read The paper argues that charged-Higgs decays to a W plus a neutral Higgs are not redundant: they are complementary to the standard fermionic channels and extend the LHC's reach in the lepton-specific two-Higgs-doublet model.

desk verdict Useful status recast of 2HDM charged Higgs searches; the heavy-mass Type-L AW reach rests on an extrapolated reinterpretation of the CMS HW search and should be flagged as such. read the letter →

arxiv 2412.04572 v1 pith:TWUAH4GX submitted 2024-12-05 hep-ph

classification hep-ph
keywords chargedHiggsbosontwodoubletmodelAWdecayHWLHCsearcheslepton-specific2HDMflavorconstraintstanβreach
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Charged Higgs bosons in the four types of two-Higgs-doublet models are usually searched for through decays to fermions: $H^\pm \to \tau\nu,\ cs,\ cb,\ tb$. This paper asks whether the less-studied decays to a $W$ plus a neutral Higgs, $H^\pm \to AW$ and $H^\pm \to HW$, deserve the same experimental attention. It answers yes: once these channels are kinematically open they dominate the charged-Higgs decay width, and the current limits on them fill in gaps left by the fermionic channels for $m_{H^\pm}$ below the top-quark mass. For heavy charged Higgses in the lepton-specific (Type-L) 2HDM, $H^\pm \to AW$ reaches $\tan\beta$ values that $H^\pm \to tb$ cannot cover. Combining all charged and neutral Higgs searches, the paper finds that almost the entire low-$\tan\beta$ region with $m_{H^\pm}$ up to about 700 GeV and $m_A$ up to about 600 GeV is already excluded.

What carries the argument

The machinery is the two-Higgs-doublet model itself, with its four fermion-coupling types (Type-I, Type-II, Type-L, Type-F), plus the exotic three-point coupling $g_{H^\pm AW}=(g/2)(p_A-p_{H^\pm})_\mu$ that lets $H^\pm\to AW$ dominate once it is kinematically open. The paper turns published $\sigma\times$BR upper limits into exclusion contours in the ($m_{H^\pm}$, $m_A$, $\tan\beta$) plane using NLO production cross sections, a 2HDM branching-fraction calculator, and LEP limits, under the electroweak-precision-motivated assumption $m_{H^\pm}=m_H$ so that $H^\pm\to HW$ is closed and the results are independent of $c_{\beta-\alpha}$.

What would settle it

Perform a detector-level simulation of the $H^\pm\to AW$ signal at a non-benchmark point, for instance $m_{H^\pm}\approx500$ GeV with $m_A\approx200$ GeV or $\Delta m_A\approx300$ GeV, using the same event selection as the published searches; if the reconstructed acceptance is materially lower than at the benchmark masses, the claimed excluded regions in the $m_{H^\pm}$ vs. $\tan\beta$ and $m_{H^\pm}$ vs. $\Delta m_A$ planes would shrink.

Watch

Extended reading notes

Core claim

The central claim is that the exotic decays $H^\pm \to AW/HW$ are not an afterthought but a complementary main channel for charged-Higgs searches. Because the $H^\pm AW$ coupling is not suppressed by $\tan\beta$ or by the alignment limit, the decay $H^\pm \to AW$ quickly dominates once $m_{H^\pm}>m_A+m_W$, and $H^\pm \to HW$ plays the same role when the mass relation $m_{H^\pm}=m_H$ is relaxed. Using published $\sigma\times$BR limits, the paper shows that for $m_{H^\pm}<m_t$ these exotic channels are complementary to the $\tau\nu$, $cs$, and $cb$ searches, and for heavy $m_{H^\pm}$ in the Type-L 2HDM they extend the excluded range of $\tan\beta$ beyond what $H^\pm\to tb$ achieves. With neutral-Higgs search constraints included, almost the entire region with $m_{H^\pm}\lesssim700$ GeV and $m_A\lesssim600$ GeV is excluded at low $\tan\beta$.

Load-bearing premise

The results rest on applying experimental $H^\pm\to AW$ limits measured at only a few benchmark mass points ($m_{H^\pm}=m_A+85$ GeV; $m_{H^\pm}=120,140,160$ GeV; $m_A=200$ GeV) to very different mass splittings such as $\Delta m_A=300$ GeV, with simple acceptance scaling rather than a full simulation at each point.

Editorial extensions

If this is right

  • Dedicated LHC searches for $H^\pm\to AW/HW$ should be extended over the full $m_{H^\pm}$ vs. $m_A$ plane, since the current fixed-mass-point searches leave much of the kinematically open region untested.
  • In the Type-L 2HDM, $H^\pm\to AW$ is the best heavy-charged-Higgs channel for $\tan\beta$ between about 1 and 5, surpassing $H^\pm\to tb$; analyses that only use the $tb$ channel underestimate the excluded parameter space.
  • At low $\tan\beta$, the combination of charged and neutral Higgs searches excludes almost the whole region with $m_{H^\pm}$ up to about 700 GeV and $m_A$ up to about 600 GeV, leaving only a narrow gap near $m_{H^\pm}\sim m_t$.
  • When $H^\pm\to AW$ opens, the fermionic branching fractions are redistributed, so exclusion limits derived from $\tau\nu$, $cs$, $cb$, or $tb$ alone do not carry over to non-degenerate mass spectra.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the benchmark-limit rescaling holds, existing LHC data may already be sensitive to additional 2HDM regions that no dedicated search has targeted; a full-simulation reinterpretation could sharpen these bounds without new data.
  • The same complementarity should appear in other models with extended Higgs sectors, such as supersymmetric ones, wherever a charged Higgs can decay to a $W$ and a lighter neutral Higgs; the Type-L case identifies where such a search would pay off.
  • The continuum $t\bar{t}b\bar{b}$ measurements, which the paper flags but does not recast, could constrain the large-width region $\Gamma/m_{H^\pm}>0.1$ where resonant searches break down.
  • Extending the $H^\pm\to AW$ search to scan $m_A$ as well as $m_{H^\pm}$, rather than fixing $m_A=200$ GeV, is the paper's own suggested next step and would likely enlarge the Type-L exclusion.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 5 minor

Summary. This paper interprets public LHC and LEP searches, together with flavor constraints, to map the allowed parameter space of the four 2HDM types. It considers conventional charged-Higgs decays (τν, cs, cb, tb) and the exotic decays H±→AW/HW, using Prospino, 2HDMC, HiggsBounds and SuperIso. It studies degenerate and non-degenerate spectra, with mH±=mH to satisfy electroweak precision constraints, and presents exclusions in the mH±–tanβ, mH±–mA, and mH±–ΔmA planes. The headline results are complementarity of the AW/HW channels for mH±<mt, an extended tanβ reach in the Type-L model for heavy H±, and a combined neutral-plus-charged exclusion up to mH±≈700 GeV and mA≈600 GeV at low tanβ.

Significance. If the heavy-H± exotic recast is valid, the paper makes a useful and falsifiable statement: the H±→AW channel is not redundant and should be included in future LHC search programs, especially in the lepton-specific 2HDM. The analysis is broad, uses standard public tools, and the authors are transparent about the fixed benchmark masses in the CMS/ATLAS exotic searches. The main result is, however, conditional on an extrapolation of the CMS H±→HW search to H±→AW and to mass splittings beyond the measured benchmark, so the significance of the Type-L extension claim is not yet established.

major comments (2)
  1. [§4.2.1, Fig. 4, Table 3] The heavy-H± exotic exclusion in Fig. 4 is based on reinterpreting the CMS H±→WH→Wττ search with mH=200 GeV [56] as an H±→AW limit. This is not a direct reinterpretation: throughout §4.2 the paper imposes mH±=mH, which kinematically closes H±→HW, so the searched process is not the model process; replacing H by A changes the spin state of the ττ system and the relevant branching ratios (e.g., H→hh is absent for A). The paper itself notes (text after Fig. 4) that limits for ΔmA≠85 GeV are only available at mA=200 GeV, but it then draws a smooth brown exclusion over the whole ΔmA=300 plane. Because the abstract's heavy-H± Type-L claim rests on this contour, the authors should either validate the acceptance transfer with a parton-level recast or clearly mark the contour as approximate and soften the corresponding claim.
  2. [§4.2.1, Fig. 4] The AW limits are measured only at discrete benchmarks: CMS [54] for mH±=mA+85 GeV, ATLAS [55] for mH±=120/140/160 GeV, and CMS [56] for mA=200 GeV. In Fig. 4 with ΔmA=300 GeV, only mH±=500 GeV corresponds to the mA=200 GeV benchmark; for neighboring points the signal acceptance, especially for the boosted ττ and W selections, is not known. The paper applies the benchmark σ×BR upper limits without an acceptance correction, so the extent of the brown region in Fig. 4 and the statement that the reach of H±→AW slightly increases with larger ΔmA are not supported by data. A conservative treatment would restrict the AW exclusion to the measured mass points, or the authors should provide a model of the mass dependence.
minor comments (5)
  1. [§3, Table 3] Table 3 labels the first column 'mass channel'; this should be 'mass region / channel', and the final states searched (e.g., Wμμ for the light searches) should be stated in the table or caption for clarity.
  2. [§4.2.1, captions of Fig. 3 and Fig. 4] The captions say 'Gray area indicates the nonphysical regions with negative values of mA' but the gray area actually begins when mA becomes negative; for ΔmA=85 GeV this means mH±<85 GeV, which is worth stating explicitly.
  3. [§4.2.3, Fig. 7] The text says 'The top-left half of the plane is not physical since it corresponds to mA<0', but in the ΔmA vs mH± plane the nonphysical region is the upper-left triangle; the wording should be adjusted to avoid ambiguity (the same applies to Fig. 8).
  4. [References] Reference [74] is formatted incompletely ('Symmetry 16 (2024) no.7, 917 doi:...'); it should include the full author list or standard journal formatting. Several other references (e.g., [29], [39], [46], [50], [51], [55]) lack arXiv identifiers or journal information.
  5. [§1] The introductory statement that exotic searches have been performed at '7 TeV, 8 TeV and 13 TeV' is not reflected in Table 3, which lists only 13 TeV searches; please align the text with the table.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the reach plots are reinterpretations of external LHC/LEP limits, and the self-citations are background or prior recasts rather than load-bearing inputs.

full rationale

This paper is a reinterpretation study, not a derivation that feeds its own output back in. The central inputs are published LEP/LHC sigma*BR limits (Tabs. 2-3), NLO production cross sections computed with prospino, decay widths and branching fractions from 2HDMC, flavor constraints from SuperIso and HiggsBounds. The exotic H+ -> AW/HW reach is obtained by taking experimental limits at benchmark masses and mapping them into the 2HDM parameter space using the model calculations; no fitted parameter is later renamed as a prediction. The extrapolation from the benchmark points (e.g., CMS with mH = 200 GeV, or Delta mA = 85 GeV for the light H+ points) to the Delta mA = 300 GeV plane in Fig. 4 is an acceptance-transfer assumption that the paper itself flags ('the experimental limits of H+ -> AW channel for Delta mA != 85 GeV are only given for a fixed value of mA = 200 GeV'), so it is a correctness or systematic caveat rather than a circular step. The self-citations [9,10,12,13,53,79] motivate the exotic channels and provide prior recasts of external LHC data; they are not invoked as a uniqueness theorem, and the key mH+ = mH mass assumption is explicitly stated as an assumption with the alternative mH+ = mA noted ('The case where mH+ = mA can be analyzed similarly'). The constraints therefore remain anchored to external experimental measurements, and no claim in the paper reduces by construction to its own input.

Assumptions & free parameters 0 free parameters · 4 assumptions · 0 invented entities

No parameter is fitted to data in this paper; the analysis scans mH+, mA and tan beta over fixed benchmarks. The main assumptions are the 2HDM framework itself, the alignment limit plus mH+ = mH slice, the reliability of the public codes, and the applicability of experimental limits at benchmark masses to nearby parameter points.

assumptions (4)
  • domain assumption The 2HDM with a softly broken Z2 symmetry and four Yukawa types (Type-I, II, L, F) is the framework for all constraints.
    Section 2 defines the model and the Yukawa structure. The paper does not derive this framework; it uses it as the starting point for all exclusion maps.
  • domain assumption The alignment limit c(beta-alpha) = 0 and the mass relation mH+ = mH are assumed.
    Sections 4.1 and 4.2 impose these to satisfy electroweak precision constraints and to close H+ to H W. The results are therefore specific to this slice of parameter space.
  • domain assumption Production cross sections from Prospino at NLO and branching fractions from 2HDMC are reliable for the scanned parameter points.
    Section 4 states that Prospino and 2HDMC are used without independent validation of their outputs in this paper.
  • ad hoc to paper Experimental sigma times BR limits from searches at benchmark masses can be reinterpreted for other mass points without full simulation.
    Section 4.2.1, especially around Figure 4, notes that limits are only given for specific masses such as mA = 200 GeV and Delta mA = 85 GeV, yet the paper applies these to other splittings such as Delta mA = 300 GeV.

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Cite this review

Pith. "Pith review of Charged Higgs Search in 2HDM." pith.science (2026). https://pith.science/paper/TWUAH4GX

@misc{pith2026241204572,
  author       = {Pith},
  title        = {Pith review of: Charged Higgs Search in 2HDM},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/TWUAH4GX}},
  note         = {Machine review of arXiv:2412.04572}
}
abstract

In this paper, we present a comprehensive study of the collider search limits on the charged Higgses in the four types of Two Higgs Double Models (2HDM). In addition to constraints from flavor physics measurements, we include both the LEP charged Higgs search channels, as well as the LHC search results on the light and heavy charged Higgses. We consider both the conventional charged Higgs search channels of $H^\pm \rightarrow \tau\nu, cs, cb, tb$, and the latest search results on the exotic decay channels $H^\pm \rightarrow A W^\pm / H W^\pm$. We find that $H^\pm \rightarrow A W^\pm / H W^\pm$ are complementary to the conventional fermionic channels for $m_{H^\pm} < m_t$. For heavy $H^\pm$, $H^\pm \rightarrow A W^\pm / H W^\pm$ extend the reach of $\tan \beta$ beyond that of $H^\pm \to tb$ in the Type-L 2HDM. We also present the combined reach of all the neutral and charged Higgs searches.

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Forward citations

Cited by 3 Pith papers

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