arxiv: 2605.13336 · v1 · submitted 2026-05-13 · ✦ hep-ph

Recognition: unknown

Probing Boosted Light Scalars in the Type-I 2HDM

Partha Konar , Tanmoy Mondal , Chandrima Sen

Authors on Pith no claims yet

Pith reviewed 2026-05-14 18:24 UTC · model grok-4.3

classification ✦ hep-ph

keywords Type-I 2HDMlight scalarsboosted fat-jetsHL-LHCelectroweak productiondouble-b jet taggingscalar mass hierarchy

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The pith

Tagging boosted double-b fat-jets from light scalars paired with gauge bosons can exclude heavy scalars up to 540 GeV at the HL-LHC in Type-I 2HDM.

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

The paper demonstrates that in the Type-I two-Higgs-doublet model, light scalars between 30 and 70 GeV can be produced electroweakly alongside heavier scalars or pseudoscalars that decay into them, yielding boosted light scalars whose b-quark pairs form identifiable fat-jets. Pairing the fat-jet tag with a standard-model gauge boson creates a searchable signature that reaches parameter regions missed by existing strategies relying on Higgs decays or direct b b-bar production. This approach yields 2 sigma exclusion of heavy scalars up to roughly 540 GeV at the high-luminosity LHC with 3000 inverse femtobarns and 365 GeV at the current LHC with 300 inverse femtobarns. The same method also supports model-independent resonance reconstruction, showing the signature remains useful even without full model assumptions.

Core claim

Electroweak production of a light scalar h together with a heavy pseudoscalar A or charged Higgs H±, followed by A or H± decaying to h plus a gauge boson, produces boosted h particles that decay to b b-bar and are reconstructed as a single fat-jet containing two b-subjets. Tagging this boosted double-b fat-jet signature in association with a standard-model gauge boson therefore probes large parts of the Type-I 2HDM parameter space for hierarchical scalar masses, delivering 2 sigma exclusion reaches for the heavy states up to approximately 540 GeV at the HL-LHC with 3000 fb^{-1} for light scalar masses in the 30-70 GeV window.

What carries the argument

The boosted double-b fat-jet (J_bb) formed by the two b-subjets from the decay of a light scalar h, tagged together with an accompanying SM gauge boson.

Load-bearing premise

The light scalar must decay predominantly to b b-bar with high branching ratio, the fat-jet tagging efficiency must stay high, and standard-model backgrounds must remain controllable at the quoted luminosities.

What would settle it

Absence of excess events above background in the J_bb plus gauge-boson channel at the HL-LHC for heavy-scalar masses near 500 GeV with 3000 fb^{-1} would falsify the projected 2 sigma exclusion reach.

read the original abstract

In the Type-I two-Higgs Doublet Model (2HDM), the additional scalars may be light ($\lesssim 100$ GeV) without conflicting with experimental constraints from LHC searches or from flavour observables. So far, the studies of light scalars at the LHC have been limited to exploring non-standard decays of the Standard Model (SM) Higgs boson or via $b\bar b$ associated production followed by leptonic decays of the light scalar. A light scalar in Type-I 2HDM can evade these search strategies due to its potentially tiny coupling to the SM Higgs boson and its suppressed coupling to quarks. In this work, we have studied electroweak production of a light scalar ($h$) in association with heavy pseudoscalar $A$ or charged Higgs $H^\pm$, which further decays into $h$, resulting in a multi-$h$ final state, where $h$ is boosted due to its lightness. The decay of the boosted $h$ into $b\bar b$ can be reconstructed within a fat-jet containing a pair of $b$-subjets. We find that tagging such a `boosted double-$b$ fat-jet ($J_{bb}$)' signature in association with a SM gauge boson provides an excellent probe of the Type-I 2HDM for hierarchical scalar spectra. Using multiple light mass $M_h$ benchmarks, we demonstrate that such analysis can explore a large region of the parameter space, with the $2\sigma$ exclusion reach for the heavy scalars extending up to $\sim 540$ GeV ($\sim$ 365 GeV) at the HL-LHC with 3000 fb$^{-1}$ (LHC with 300 fb$^{-1}$) luminosity for light scalar masses in the range $30$--$70$ GeV. Furthermore, we show that significant sensitivity and even resonance reconstruction can be achieved within a model-independent framework, highlighting the robustness of this search strategy.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

The paper offers a concrete new search strategy for light scalars in Type-I 2HDM via boosted double-b fat jets plus a gauge boson, projecting heavy scalar exclusions to ~540 GeV at HL-LHC, but those numbers depend on untested assumptions about bb branching ratios and tagging efficiency.

read the letter

The key takeaway is that this work puts forward a new LHC probe for light scalars in the Type-I 2HDM by looking at their electroweak production alongside heavy A or H±, with the heavy state decaying to the light h plus a W or Z, and then tagging the boosted h as a double-b fat jet. That setup targets the hierarchical mass spectra where usual searches miss out because of small couplings. The paper does a solid job laying out why this signature helps: the light h is boosted, its bb decay gets captured in one fat jet, and associating it with a SM gauge boson reduces backgrounds. They run several mass points from 30 to 70 GeV and get exclusion reaches for the heavy scalars that look competitive with existing limits. Where it gets softer is in the supporting details. The quoted reaches assume the bb branching ratio stays high enough despite the suppressed fermion couplings in Type-I, and that the J_bb tagging efficiency doesn't drop too much. Backgrounds from vector boson plus jets at high transverse momentum are tricky, and without explicit validation or systematic breakdowns, the 540 GeV number at 3000 fb^{-1} feels like it could shift. The stress-test concern about the mixing factor affecting the partial width is worth checking in the full text. This paper is aimed at people doing 2HDM phenomenology and LHC searches for extended Higgs sectors. A reader interested in new search strategies will find the idea useful and the projections concrete enough to follow up on. It shows clear thinking on how to exploit the kinematics in hierarchical spectra. I would send it for peer review. The strategy is original enough and the quantitative claims are specific, so referees can dig into the Monte Carlo and tagging assumptions.

Referee Report

3 major / 1 minor

Summary. The paper proposes using electroweak production of a light scalar h (30-70 GeV) in association with heavy A or H± in the Type-I 2HDM, where the heavy states decay to h plus a gauge boson, yielding a boosted h reconstructed as a double-b fat-jet (J_bb) plus SM gauge boson. It claims this signature probes hierarchical spectra with 2σ exclusion reaches for heavy scalars up to ~540 GeV at HL-LHC (3000 fb^{-1}) and ~365 GeV at LHC (300 fb^{-1}), and demonstrates sensitivity in a model-independent framework.

Significance. If the analysis holds, the work provides a new channel for light scalars in Type-I 2HDM where traditional b-associated or SM-Higgs-decay searches are limited by suppressed couplings. The boosted J_bb tagging approach for multi-Higgs final states could meaningfully extend LHC sensitivity to hierarchical spectra.

major comments (3)

[Abstract] Abstract: the quoted 2σ exclusion reaches (~540 GeV at HL-LHC) are presented without any reported details on background modeling for V + multi-jet processes, systematic uncertainties on the J_bb tagging working point, or validation of tagging efficiency, which directly limits support for the numerical claims.
[Model and benchmarks] Model section: in Type-I 2HDM the light scalar's fermion couplings are scaled by a mixing factor (cos(β-α) or equivalent), which can suppress the partial width to bb relative to gg or ττ; the reach estimates assume BR(h→bb) remains high enough for the signal yield, but no explicit branching-ratio calculations or scans over the mixing angle are shown for the benchmarks.
[Analysis and results] Analysis and results: the projected reaches rely on standard Monte Carlo simulations of signal and background without data-driven validation or discussion of how high-pT V + jets backgrounds are controlled after the fat-jet tagging, making the precise luminosity-dependent numbers sensitive to unquantified assumptions.

minor comments (1)

[Introduction] The notation J_bb for the boosted double-b fat-jet is introduced in the abstract but would benefit from an explicit definition and efficiency parametrization in the methods section for clarity.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive and detailed comments. We have addressed each major point below, providing clarifications and indicating where revisions will be incorporated to strengthen the manuscript.

read point-by-point responses

Referee: [Abstract] Abstract: the quoted 2σ exclusion reaches (~540 GeV at HL-LHC) are presented without any reported details on background modeling for V + multi-jet processes, systematic uncertainties on the J_bb tagging working point, or validation of tagging efficiency, which directly limits support for the numerical claims.

Authors: We agree that the abstract is concise and omits technical details on background modeling, systematic uncertainties, and tagging validation. These elements are presented in the Analysis and Results sections, where we describe the Monte Carlo generation of V + jets backgrounds, the J_bb tagging algorithm performance (efficiency and mistag rates derived from simulation), and basic systematic variations. To better support the quoted reaches, we will revise the abstract to include a brief reference to the simulation framework and tagging methodology. revision: yes
Referee: [Model and benchmarks] Model section: in Type-I 2HDM the light scalar's fermion couplings are scaled by a mixing factor (cos(β-α) or equivalent), which can suppress the partial width to bb relative to gg or ττ; the reach estimates assume BR(h→bb) remains high enough for the signal yield, but no explicit branching-ratio calculations or scans over the mixing angle are shown for the benchmarks.

Authors: The referee correctly identifies the role of the mixing angle in Type-I 2HDM. For the chosen benchmarks, we selected mixing parameters such that BR(h → bb) remains dominant (approximately 80–90% for mh = 30–70 GeV), consistent with the hierarchical spectrum where the light scalar couplings to fermions are not strongly suppressed. We will add explicit branching-ratio calculations for the benchmarks and a short discussion of the viable mixing-angle range in the revised Model section to make this assumption transparent. revision: yes
Referee: [Analysis and results] Analysis and results: the projected reaches rely on standard Monte Carlo simulations of signal and background without data-driven validation or discussion of how high-pT V + jets backgrounds are controlled after the fat-jet tagging, making the precise luminosity-dependent numbers sensitive to unquantified assumptions.

Authors: The analysis employs standard Monte Carlo tools for signal and background generation, with high-pT V + jets backgrounds suppressed via the double-b subjet requirement inside the fat-jet together with kinematic cuts on the associated gauge boson. Tagging efficiencies and basic systematic variations are evaluated from simulation. As this is a prospective study for future luminosities, data-driven validation is not feasible; we will expand the Results section with additional discussion of post-tagging background composition and estimated uncertainties on the tagging working point to reduce reliance on unquantified assumptions. revision: partial

Circularity Check

0 steps flagged

No significant circularity in projected exclusion reaches

full rationale

The paper derives projected 2σ exclusion reaches (up to ~540 GeV at HL-LHC) for heavy scalars via Monte Carlo simulation of electroweak production of light h in association with A or H±, followed by boosted h → bb reconstructed as a double-b fat-jet J_bb plus a gauge boson. These reaches are forward projections under stated assumptions on branching ratios, tagging efficiencies, and background control; no parameters are fitted to data subsets inside the paper and then presented as independent predictions. No self-definitional steps, uniqueness theorems imported from the authors' prior work, or ansatze smuggled via self-citation appear in the derivation chain. The analysis relies on standard simulation tools and established jet-tagging methods, making the central claims self-contained against external benchmarks rather than reducing to the paper's own inputs by construction.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard 2HDM model assumptions and collider simulation techniques; no new particles or forces are introduced, and free parameters are limited to benchmark mass choices rather than global fits.

free parameters (1)

Light scalar mass benchmarks
M_h values of 30-70 GeV chosen to illustrate reach for light scalars.

axioms (2)

domain assumption Light scalar decays predominantly to b b-bar
Follows from Type-I 2HDM coupling structure for the chosen parameter space.
domain assumption Standard LHC detector response and background modeling
Used to derive the quoted exclusion limits.

pith-pipeline@v0.9.0 · 5664 in / 1500 out tokens · 84105 ms · 2026-05-14T18:24:29.323786+00:00 · methodology

discussion (0)

Reference graph

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