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arxiv: 2606.01681 · v1 · pith:TEC5BCGLnew · submitted 2026-06-01 · ✦ hep-ph · hep-ex

Probing pair production of long-lived scalars via an off-shell Standard-Model-like Higgs boson at the LHC

Lei Wang , Xianbo Yu , Zeren Simon Wang This is my paper

Pith reviewed 2026-06-28 14:28 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords long-lived scalarsHiggs portaldisplaced verticesoff-shell Higgspair productionLHC phenomenologyATLAS search
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The pith

Off-shell Higgs production of long-lived scalar pairs is already excluded up to 230 GeV by ATLAS displaced-vertex data.

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

The paper examines scalars S that mix weakly with the Higgs boson and therefore live long enough to decay inside the detector after being produced in pairs. Production proceeds through an off-shell Higgs via gluon fusion, a channel that remains open for scalar masses above the on-shell Higgs decay threshold. Monte Carlo simulation of the resulting displaced-vertex-plus-jets signature is used to reinterpret an existing ATLAS search, showing that current data already carves out a sizable region of the mass-lifetime plane. A modified selection and projections for the high-luminosity LHC are also presented as ways to enlarge the excluded region further.

Core claim

The channel gg → h* → SS, with h* an off-shell Standard-Model-like Higgs boson, generates long-lived scalars whose decays produce displaced vertices accompanied by jets. Reinterpretation of an ATLAS DV-plus-jets search in this topology excludes scalar masses up to roughly 230 GeV for a benchmark hSS coupling λv of 246 GeV; a modified analysis and high-luminosity LHC projections extend the sensitivity across wider ranges of mass and lifetime.

What carries the argument

The gg → h* → SS production process mediated by an off-shell SM-like Higgs boson, which yields displaced-vertex signatures from the subsequent decays of the long-lived scalars S.

If this is right

  • Existing ATLAS data already rules out scalar masses up to 230 GeV for the benchmark coupling value.
  • A modified analysis strategy based on the same search improves sensitivity across a broader mass-lifetime region.
  • High-luminosity LHC projections further enlarge the excluded parameter space.
  • The off-shell channel accesses scalar masses above the kinematic limit of on-shell Higgs decay h → SS.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same recast technique could be applied to other final states or other long-lived particles produced through the Higgs portal.
  • Limits derived here would translate directly into upper bounds on the Higgs-scalar mixing angle in any model that generates the hSS vertex.
  • If the exclusions survive more detailed detector modeling, they would narrow the viable parameter space for scalar extensions that rely on small mixing to achieve long lifetimes.

Load-bearing premise

The recast of the ATLAS DV-plus-jets search accurately reproduces the signal efficiency and background rates for the specific off-shell Higgs-mediated topology and decay kinematics of S.

What would settle it

A dedicated full-detector simulation of gg → h* → SS events that returns signal efficiencies or background compositions substantially different from those assumed in the recast would remove the claimed exclusions.

Figures

Figures reproduced from arXiv: 2606.01681 by Lei Wang, Xianbo Yu, Zeren Simon Wang.

Figure 1
Figure 1. Figure 1: FIG. 1. Left panel: the branching ratios of various decay channels of [PITH_FULL_IMAGE:figures/full_fig_p007_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. The Feynman diagram for [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: displays the MadGraph5-computed cross sections of the signal processes as func￾tions of mS at √ s = 14 TeV, for gg → h ∗ → SS and gg → h ∗ → SS → XXY Y where XXY Y denotes several main decay channels of the two S’s particles in the mass range of 11 [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Sensitivity reach to sin [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Sensitivity reach to sin [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
read the original abstract

We study the collider phenomenology of a long-lived scalar particle $S$ that arises from Higgs mixing in a broad class of Standard-Model (SM) extensions. When the mixing angle is sufficiently small, $S$ becomes long-lived, while its pair production via the Higgs portal can remain sizable. We focus on the production channel $gg \to h^* \to SS$ at the LHC, mediated by an \textit{off-shell} SM-like Higgs boson. This mechanism provides a complementary probe of $S$ in the mass region above the kinematic threshold of the conventional on-shell decay $h \to SS$, thereby extending the accessible parameter space to heavier scalars. The long-lived $S$ particles can decay inside the inner detector, leading to displaced vertices (DVs) accompanied by jets. We perform a detailed Monte Carlo simulation and reinterpret an existing recast of an ATLAS search for DV-plus-jets signatures in this scenario. We also consider a modified analysis strategy based on the same search to assess potential improvements in sensitivity. We find that the current ATLAS search already excludes a significant region of the parameter space, reaching scalar masses up to $m_S \sim 230$ GeV for a benchmark $hSS$ coupling $\lambda v$ of $246$ GeV. The modified analysis and projections to the high-luminosity LHC further extend the sensitivity to wider regions of the mass--lifetime parameter space.

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.

Referee Report

1 major / 0 minor

Summary. The manuscript studies long-lived scalars S produced in pairs via off-shell Higgs mediation (gg → h* → SS) at the LHC. Using Monte Carlo simulation, it reinterprets an existing ATLAS displaced-vertex-plus-jets search and claims that current data excludes m_S up to ~230 GeV for λv = 246 GeV, with further reach from modified strategies and HL-LHC projections.

Significance. If validated, the result provides a complementary probe of the Higgs portal for long-lived particles in a mass range inaccessible to on-shell h → SS decays. It leverages existing experimental data through recasting, which is a strength for timely constraints on new physics.

major comments (1)
  1. [Monte Carlo simulation and reinterpretation] The headline exclusion (m_S ∼ 230 GeV at λv = 246 GeV) depends on the signal efficiency in the recast of the ATLAS DV+jets search. Because the mediator is off-shell, the SS invariant-mass spectrum is continuous and the boost and decay-length distributions differ from on-shell benchmarks. The manuscript provides no cut-flow tables, efficiency versus m_S curves, or cross-checks confirming that the recast remains valid for this topology within the precision needed to support the quoted mass reach.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for highlighting the need for greater transparency in the Monte Carlo reinterpretation. We address the major comment below.

read point-by-point responses

  1. Referee: [Monte Carlo simulation and reinterpretation] The headline exclusion (m_S ∼ 230 GeV at λv = 246 GeV) depends on the signal efficiency in the recast of the ATLAS DV+jets search. Because the mediator is off-shell, the SS invariant-mass spectrum is continuous and the boost and decay-length distributions differ from on-shell benchmarks. The manuscript provides no cut-flow tables, efficiency versus m_S curves, or cross-checks confirming that the recast remains valid for this topology within the precision needed to support the quoted mass reach.

    Authors: We agree that the off-shell nature of the mediator produces a continuous m_SS spectrum and distinct boost/decay-length distributions relative to on-shell benchmarks, and that explicit validation material is needed to support the quoted reach. Our Monte Carlo generation already incorporates the full off-shell kinematics via the Higgs portal, but the manuscript does not present cut-flow tables or efficiency curves versus m_S. We will add these in the revised version, together with a short discussion of the kinematic differences and a statement on the applicability of the ATLAS recast to this topology. revision: yes

Circularity Check

0 steps flagged

No circularity; exclusion derived from external ATLAS recast via MC simulation

full rationale

The paper's central result—an exclusion reaching m_S ~230 GeV—is obtained by generating gg→h*→SS events with Monte Carlo, then feeding them into a pre-existing recast of an ATLAS displaced-vertex-plus-jets search. No equation defines a quantity in terms of itself, no fitted parameter is relabeled as a prediction, and the load-bearing step (signal efficiency and background rates) rests on external experimental data rather than internal self-citation or ansatz. The derivation chain is therefore self-contained against benchmarks outside the paper.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 1 invented entities

The central claim rests on the existence of a scalar S from Higgs mixing in SM extensions, a benchmark value for the hSS coupling, and the assumption that the ATLAS search recast applies directly to the new topology.

free parameters (1)
  • λv (hSS coupling)
    Benchmark value of 246 GeV used to quote the mass reach; chosen by hand for the exclusion plot.
axioms (1)
  • domain assumption S arises from Higgs mixing in a broad class of SM extensions with small mixing angle yielding long lifetime
    Invoked in the model setup and production mechanism description.
invented entities (1)
  • long-lived scalar S no independent evidence
    purpose: New particle from Higgs portal mixing that is long-lived and produced in pairs via off-shell h
    Postulated in the model; no independent evidence provided outside the paper.

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discussion (0)

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