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arxiv: 2510.02857 · v1 · 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 TeV and sqrt{s}=13.6 TeV with the ATLAS detector

ATLAS Collaboration This is my paper

Pith reviewed 2026-05-21 21:09 UTC · model grok-4.3

classification ✦ hep-ex
keywords resonance searchscalar particleHiggs bosonATLAS detectorbottom quarksdiphotonsbranching ratio limitsproton-proton collisions
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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 a Higgs boson in the bb gamma gamma final state.

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

The paper searches for resonant production of a new heavy scalar particle X that decays into a lighter scalar S and the known Higgs boson, with S decaying to a pair of bottom quarks and the Higgs to a pair of photons. Data from proton-proton collisions at 13 TeV and 13.6 TeV are analyzed over wide mass ranges for both X and S. No deviation from the expected Standard Model background is seen. Upper limits are placed on the product of the production cross section and the branching ratio for the full decay chain.

Core claim

Using 140 fb^{-1} at 13 TeV and 58.6 fb^{-1} at 13.6 TeV, the analysis finds no significant excess over the Standard Model background prediction across the mass ranges 170 to 1000 GeV for m_X and 15 to 500 GeV for m_S, and therefore sets 95% confidence level limits on sigma(X to S(bb) H(gamma gamma)) that range from 9 fb down to 0.06 fb.

What carries the argument

The resonant search in the two b-tagged jets plus two photons final state, relying on the diphoton invariant mass to tag the Higgs and the dijet mass to reconstruct the lighter scalar.

If this is right

  • Models predicting additional scalars with masses in the studied ranges are constrained by the reported upper limits.
  • The absence of signal tightens the allowed parameter space for theories with extended Higgs sectors that couple to bottom quarks and photons in this pattern.
  • Future increases in integrated luminosity would directly scale the sensitivity to smaller cross-section times branching-ratio values.

Where Pith is reading between the lines

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

  • Similar searches in other final states such as tau pairs or four jets could complement these limits if the lighter scalar has different dominant decays.
  • The results provide a benchmark for reinterpretation in specific beyond-Standard-Model scenarios such as two-Higgs-doublet models with additional singlets.
  • Combining the 13 TeV and 13.6 TeV datasets into a single limit improves the constraint on any mass-dependent production mechanism.

Load-bearing premise

The Standard Model accurately describes the background processes in the selected final state with two b-jets and two photons, and the signal efficiency and acceptance are correctly estimated from simulation.

What would settle it

A statistically significant excess of events in the reconstructed X mass spectrum above the expected background in one or more signal regions would indicate the presence of the resonance.

read the original abstract

A search for the resonant production of a heavy scalar $X$ decaying into a Higgs boson and a lighter scalar $S$, 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 fb$^{-1}$ and 58.6 fb$^{-1}$ of proton-proton collision data at centre-of-mass energies of 13 TeV and 13.6 TeV respectively, recorded with the ATLAS detector at the Large Hadron Collider. 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 cross-section times branching ratio $\sigma(X \rightarrow S (\rightarrow b \bar{b})H ( \rightarrow \gamma\gamma))$ 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

2 major / 3 minor

Summary. This manuscript reports a search for resonant production of a heavy scalar X decaying to a lighter scalar S and the Higgs boson, with S → b b-bar and H → γγ, using 140 fb^{-1} at √s=13 TeV and 58.6 fb^{-1} at √s=13.6 TeV recorded with the ATLAS detector. The analysis scans 170 ≤ m_X ≤ 1000 GeV and 15 ≤ m_S ≤ 500 GeV. No significant excess over the Standard Model background is observed, and 95% CL upper limits are set on σ(X → S(→bb)H(→γγ)) ranging from 9 fb to 0.06 fb.

Significance. If the background modeling and efficiency estimates hold, the result constrains extended Higgs sectors and other BSM scenarios with additional scalars. The diphoton channel provides excellent mass resolution while b-tagging suppresses backgrounds, and combining the two center-of-mass energies strengthens the limits across the scanned plane.

major comments (2)
  1. [§5] §5 (Background estimation): The data-driven sideband method for the diphoton mass spectrum must be validated after applying the b-jet selection and the resonant X-mass window; any residual shape bias from the two-dimensional mass plane would directly affect the extracted limits.
  2. [§6.3] §6.3 (Limit-setting procedure): The binned likelihood fit incorporates systematic uncertainties, but the propagation of the dominant sources (jet energy scale, photon identification efficiency, and MC statistics in high-mass bins) to the final 95% CL contours should be shown explicitly for representative (m_X, m_S) points to confirm the quoted range is not dominated by a single uncertainty.
minor comments (3)
  1. [Abstract] Abstract: The total integrated luminosity is stated as 199 fb^{-1}; a short sentence clarifying how the 13 TeV and 13.6 TeV datasets are combined (or treated separately) in the final limit extraction would improve clarity.
  2. [Figure 7] Figure 7 (limit plots): The color scale and contour lines for the observed and expected limits should include a legend entry for the 1σ and 2σ expected bands to avoid ambiguity when comparing to other searches.
  3. [Table 2] Table 2 (event yields): The background composition breakdown after the final selection could usefully separate the non-resonant γγ + jets component from any resonant contributions to aid reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful review and positive recommendation for minor revision. The comments have helped us improve the clarity of the background validation and limit-setting procedures. We address each major comment below and have incorporated revisions where they strengthen the manuscript without altering the core results.

read point-by-point responses

  1. Referee: [§5] §5 (Background estimation): The data-driven sideband method for the diphoton mass spectrum must be validated after applying the b-jet selection and the resonant X-mass window; any residual shape bias from the two-dimensional mass plane would directly affect the extracted limits.

    Authors: We agree that explicit validation after the full selection chain is important to rule out shape biases in the two-dimensional mass plane. Section 5 already describes the sideband method and its application in control regions that include b-tagging. In the revised manuscript we have added a new paragraph and supplementary figure that explicitly show the diphoton mass fit performed inside the resonant X-mass window after the b-jet requirements. The fit residuals and pull distributions remain consistent with expectations, confirming that any residual bias is negligible compared with the assigned systematic uncertainties. This addition directly addresses the referee's concern. revision: yes

  2. Referee: [§6.3] §6.3 (Limit-setting procedure): The binned likelihood fit incorporates systematic uncertainties, but the propagation of the dominant sources (jet energy scale, photon identification efficiency, and MC statistics in high-mass bins) to the final 95% CL contours should be shown explicitly for representative (m_X, m_S) points to confirm the quoted range is not dominated by a single uncertainty.

    Authors: We concur that showing the explicit impact of the leading systematics on the final limits improves transparency. The binned likelihood already treats jet energy scale, photon identification efficiency, and MC statistical uncertainties as nuisance parameters. To make this propagation visible, the revised manuscript now includes a new table that reports the relative change in the 95% CL upper limit when each of these sources is removed in turn, evaluated at four representative (m_X, m_S) points spanning the scanned plane. The table demonstrates that no single uncertainty dominates the quoted limit range; the total uncertainty remains a balanced combination of statistical and systematic contributions. revision: yes

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper reports a standard ATLAS resonance search in the bbγγ final state. Background estimation uses data-driven sideband methods for the diphoton mass spectrum together with MC for resonant components; signal acceptance and efficiency are taken from simulation across the scanned mass plane. Limits at 95% CL are extracted from a binned likelihood fit to the observed data under the background-only hypothesis. No equation or result reduces by construction to a fitted parameter or self-citation; the central null result and cross-section limits are directly constrained by independent collision data. Self-citations refer to established detector and analysis techniques that are externally validated and do not carry the load of the reported limits.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the validity of SM background modeling and detector simulation for signal efficiency.

free parameters (1)
  • mass binning and selection cuts
    The mass ranges and event selection are chosen to optimize sensitivity, which can involve tuning based on expected signal.
axioms (1)
  • domain assumption Standard Model predictions for background are reliable in this kinematic regime
    The no-excess claim depends on accurate SM background estimation.

pith-pipeline@v0.9.0 · 5776 in / 1245 out tokens · 59394 ms · 2026-05-21T21:09:16.228686+00:00 · methodology

discussion (0)

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Forward citations

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