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arxiv: 2510.02857 · v2 · pith:7KIPD7VGnew · submitted 2025-10-03 · ✦ hep-ex

Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb⁻¹ of data collected at sqrt{s}=13 and 13.6 TeV with the ATLAS detector

Pith reviewed 2026-05-25 07:32 UTC · model grok-4.3

classification ✦ hep-ex
keywords resonance searchscalar particlesHiggs bosondiphoton decaybottom quark decayATLAS experimentLHCnew physics
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0 comments X

The pith

No significant excess is observed in the search for a heavy scalar X decaying to a lighter scalar S and the Higgs boson.

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

This paper reports a search for the resonant production of a heavy scalar particle X that decays into a lighter scalar S and the Standard Model Higgs boson. The search focuses on the final state where S decays to a pair of bottom quarks and the Higgs decays to two photons, using ATLAS detector data from proton-proton collisions at 13 and 13.6 TeV with a total luminosity of 199 fb^{-1}. The analysis covers a wide range of masses for both X and S, and finds no evidence beyond the expected background. Upper limits are placed on the product of the production cross section and the branching fraction for this process.

Core claim

No significant excess over the Standard Model background prediction is observed in the X → S(→ b b̄) H(→ γγ) channel, allowing 95% confidence level limits on the cross section times branching fraction ranging from 9 fb to 0.06 fb for the process at 13 TeV.

What carries the argument

The two-photon and two-bottom-quark final state selection and mass reconstruction to search for resonances in the X and S mass planes.

If this is right

  • Models predicting additional scalar particles in this mass range are constrained by the upper limits.
  • The search can be extended with more data to probe smaller cross sections.
  • The limits apply specifically to the 13 TeV dataset but similar sensitivities are expected at 13.6 TeV.

Where Pith is reading between the lines

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

  • This result can be combined with searches in other decay channels to further constrain extended Higgs sectors.
  • Future high-luminosity LHC runs could either discover such a resonance or push the limits much lower.
  • If the background modeling assumption holds, these limits provide a benchmark for theoretical models with multiple scalars.

Load-bearing premise

The Standard Model background prediction accurately describes the observed data across the full mass range in the signal regions.

What would settle it

A statistically significant excess in the reconstructed invariant mass distributions of the two photons and two b-jets above the predicted background would falsify the no-signal claim.

read the original abstract

A search for the resonant production of a heavy scalar $X$ decaying into a lighter scalar $S$ and a Higgs boson, through the process $X \rightarrow S (\rightarrow b \bar{b})H ( \rightarrow \gamma\gamma)$, where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using integrated luminosities of 140 and 59 fb$^{-1}$ of proton-proton collision data at centre-of-mass energies of 13 and 13.6 TeV, respectively, recorded with the ATLAS detector at the LHC. The search is performed over the mass ranges of 170 $\leq$ $m_{X}$ $\leq$ 1000 GeV and 15 $\leq$ $m_{S}$ $\leq$ 500 GeV. No significant excess over the Standard Model background prediction is observed and limits at 95% confidence level are set on the product of cross section and branching fraction for the process $X \rightarrow S (\rightarrow b \bar{b})H ( \rightarrow \gamma\gamma)$ at 13 TeV, ranging from 9 fb to 0.06 fb.

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

0 major / 1 minor

Summary. The manuscript reports a search for resonant production of a heavy scalar X decaying to a lighter scalar S and the Higgs boson via X → S(→bb)H(→γγ) using 140 fb^{-1} at 13 TeV and 59 fb^{-1} at 13.6 TeV recorded with the ATLAS detector. The search covers 170 ≤ m_X ≤ 1000 GeV and 15 ≤ m_S ≤ 500 GeV. No significant excess over the SM background is observed, and 95% CL limits are placed on σ × BR ranging from 9 fb to 0.06 fb.

Significance. This is a standard null-result search in a well-established final state that constrains BSM scenarios with additional scalars. The analysis employs established ATLAS methods including data-driven background estimation for the diphoton + di-b-jet channel. The stress-test concern on background modeling accuracy does not land as a load-bearing issue; the provided description indicates use of simulation plus data-driven techniques with systematic uncertainties, consistent with prior ATLAS publications in this channel.

minor comments (1)
  1. Abstract: the quoted limits are stated to be 'at 13 TeV' while the dataset includes 13.6 TeV data; clarify whether the limits are derived from the 13 TeV sample alone, the combined dataset, or if 13.6 TeV results are presented separately.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript and their recommendation to accept. There are no major comments requiring a point-by-point response.

Circularity Check

0 steps flagged

No circularity: standard experimental null-result search with direct data-to-background comparison

full rationale

The paper performs a resonance search in the X → S(→bb)H(→γγ) channel using ATLAS data at 13/13.6 TeV. The central result is the observation of no significant excess over the modeled SM background, followed by 95% CL limits on σ×BR. This follows from direct comparison of observed events to predicted background yields (including data-driven and simulation-based estimates with systematics) across mass ranges, without any parameter fitted to the signal region that is then reinterpreted as a prediction. No equations, ansatze, or self-citations reduce the limit-setting procedure to a tautology or to prior author work by construction. The analysis relies on established experimental methods whose validity is independently testable against control regions and external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on accurate modeling of Standard Model backgrounds and detector response; no free parameters or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption Standard Model background processes are correctly modeled in simulation and data-driven estimates without significant mismodeling in the signal region.
    The 'no significant excess' statement depends directly on this background accuracy.

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discussion (0)

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