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arxiv: 2606.04855 · v1 · pith:3T6GGTK5new · submitted 2026-06-03 · ✦ hep-ex

Probing the Higgs-top Yukawa interaction in the tbar{t}H and tH processes using Hrightarrowγγ with the ATLAS detector

ATLAS Collaboration This is my paper

Pith reviewed 2026-06-28 03:06 UTC · model grok-4.3

classification ✦ hep-ex
keywords Higgs bosontop quarkYukawa couplingCP violationATLAS experimentttH productiondiphoton decayLHC
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The pith

ATLAS data from ttH and tH events excludes a purely CP-odd Higgs-top Yukawa coupling at 5.8 standard deviations.

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

The paper measures the ttH production cross section times the Higgs diphoton branching ratio in 164 fb^{-1} of 13.6 TeV data, finding a value 1.13 times the Standard Model prediction. It also sets an observed upper limit of 6.2 times the SM on the tH process. When these results are combined with earlier 13 TeV data in the same final state, the analysis constrains the CP-mixing angle alpha in the Higgs-top Yukawa interaction. A sympathetic reader cares because any sizable CP-odd component would point to new physics beyond the Standard Model in the top-Higgs sector, which is otherwise expected to be purely CP-even.

Core claim

Using proton-proton collisions at 13.6 TeV recorded by ATLAS, the ttH cross section times H to gamma gamma branching ratio is measured as 1.46 fb, consistent with the Standard Model expectation of 1.13 times that value. An observed 95% CL limit of 6.2 times the SM is placed on tH production. Combining the new data with 140 fb^{-1} at 13 TeV excludes a CP-mixing angle |alpha| greater than 38 degrees at 95% CL and rules out a purely CP-odd Higgs-top Yukawa coupling at 5.8 standard deviations, yielding the strongest direct constraints on the CP properties of this coupling.

What carries the argument

The CP-mixing angle alpha that parametrizes the relative strength of scalar and pseudoscalar components in the Higgs-top Yukawa coupling, constrained through the rates and kinematic distributions of ttH and tH production in the diphoton decay channel.

If this is right

  • The ttH cross section times branching ratio is determined to be 1.46 fb with combined statistical and systematic uncertainties of roughly 30 percent.
  • The tH production rate is constrained by an observed upper limit of 6.2 times the Standard Model expectation.
  • A CP-mixing angle |alpha| exceeding 38 degrees is ruled out at 95 percent .
  • A purely CP-odd Higgs-top Yukawa coupling is excluded at 5.8 standard deviations.

Where Pith is reading between the lines

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

  • These limits reduce the allowed parameter space for models that introduce additional CP violation in the top-Higgs sector to explain the matter-antimatter asymmetry.
  • Future LHC runs with more data could push the exclusion on |alpha| below 20 degrees if the central value remains near zero.
  • The result strengthens the case that any beyond-Standard-Model effects in the top-Higgs interaction must preserve approximate CP-even structure.
  • Complementary constraints from other decay channels or production modes could test whether the diphoton-based limits hold universally.

Load-bearing premise

Monte Carlo simulations are assumed to correctly describe both the ttH and tH signal processes and the main backgrounds after all analysis selections, with the assigned systematic uncertainties fully accounting for any simulation-to-data differences.

What would settle it

A future measurement with higher luminosity that finds the observed ttH or tH rate or angular distributions inconsistent with the SM prediction at a level that would allow |alpha| above 38 degrees at 95% CL.

read the original abstract

A study of the structure of the coupling between the Higgs boson and the top quark is performed using events from $t\bar{t}H$ and $tH$ production in the $H\rightarrow\gamma\gamma$ decay channel, with 164 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s}$ = 13.6 TeV collected by the ATLAS detector at the LHC. The cross section of the $t\bar{t}H$ process times the Higgs to diphoton decay branching ratio is measured to be $1.46^{+0.40}_{-0.35} = 1.46^{+0.34}_{-0.32}\,\text{(stat.)}^{+0.22}_{-0.13}\,\text{(sys.)}$ fb, corresponding to $1.13^{+0.33}_{-0.28}$ times the Standard Model prediction. An observed 95% confidence level limit on the $tH$ production cross section times the Higgs to diphoton decay branching ratio is set at 6.2 times the Standard Model prediction, compared to an expected limit of 4.4 times, constituting the most stringent $tH$ upper limit achieved in a single measurement to date. The results are combined with 140 fb$^{-1}$ of proton-proton collision data collected at $\sqrt{s}$ = 13 TeV in the same production and decay channel, and a $CP$-mixing angle of $|\alpha|>38^\circ$ is excluded at the 95% confidence level, with a purely $CP$-odd Higgs-top Yukawa coupling excluded at the level of 5.8 standard deviations, providing the most stringent direct constraints on the $CP$ structure of the Higgs-top Yukawa interaction to date.

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 / 1 minor

Summary. The manuscript reports a measurement of the ttH cross section times the H→γγ branching ratio of 1.46^{+0.40}_{-0.35} fb (1.13^{+0.33}_{-0.28} times the SM prediction) using 164 fb^{-1} of 13.6 TeV ATLAS data, an observed 95% CL upper limit on tH production times BR of 6.2 times SM (expected 4.4), and—after combination with 140 fb^{-1} of 13 TeV data—a 95% CL exclusion of |α|>38° together with 5.8σ exclusion of a purely CP-odd Higgs-top Yukawa coupling, presented as the most stringent direct constraints to date.

Significance. If the central results hold, the work supplies the tightest direct experimental bounds on the CP-mixing angle in the Higgs-top Yukawa interaction by exploiting both ttH and tH production in the diphoton channel and combining two center-of-mass energies. The ttH rate measurement is consistent with the SM and the tH limit is the strongest single-experiment result reported so far; the shape-based CP analysis adds new information beyond rate-only constraints.

major comments (1)
  1. [Results section (CP fit and systematic uncertainties)] The 5.8σ exclusion of a purely CP-odd coupling and the |α|>38° limit are extracted from a fit to CP-sensitive kinematic distributions. The manuscript must demonstrate, with explicit data-MC comparisons or closure tests in the signal regions after all cuts, that Monte Carlo modeling of the shapes of these discriminating variables (angular and energy observables) is accurate to within the assigned systematic uncertainties; residual mismodeling outside those uncertainties would directly shift the extracted limits on α.
minor comments (1)
  1. [Abstract] The abstract states the combined result but does not specify how the 13 TeV and 13.6 TeV datasets are statistically combined or how common systematic uncertainties are treated; a brief sentence would improve clarity.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful review and constructive feedback on our manuscript. We address the single major comment below.

read point-by-point responses

  1. Referee: [Results section (CP fit and systematic uncertainties)] The 5.8σ exclusion of a purely CP-odd coupling and the |α|>38° limit are extracted from a fit to CP-sensitive kinematic distributions. The manuscript must demonstrate, with explicit data-MC comparisons or closure tests in the signal regions after all cuts, that Monte Carlo modeling of the shapes of these discriminating variables (angular and energy observables) is accurate to within the assigned systematic uncertainties; residual mismodeling outside those uncertainties would directly shift the extracted limits on α.

    Authors: We agree that explicit validation of Monte Carlo shape modeling for the CP-sensitive observables is important to support the extracted limits on α. The manuscript already incorporates dedicated systematic uncertainties derived from data-MC comparisons and variations in the modeling of these variables. To address the request directly, the revised manuscript adds explicit data-MC comparison plots for the key angular and energy observables in the signal regions after all cuts, together with closure tests based on pseudo-experiments. These are presented in an expanded subsection of the Results section and in the supplementary material. The added material confirms consistency within the assigned uncertainties and does not alter the central results or limits. revision: yes

Circularity Check

0 steps flagged

No circularity: results extracted from data fit

full rationale

The paper reports cross-section measurements and CP-mixing limits obtained by fitting observed collision data in the diphoton channel. The ttH cross section, tH limit, and |α| exclusion are outputs of a likelihood fit to kinematic distributions; none of the quoted results is defined in terms of itself or obtained by renaming a fitted input as a prediction. No self-citation chain is load-bearing for the central claim, and the derivation does not reduce to any of the enumerated circular patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The measurement rests on standard LHC experimental assumptions rather than new theoretical postulates. No free parameters are explicitly fitted beyond the signal strength itself; no new particles or forces are introduced.

axioms (2)
  • domain assumption Monte Carlo simulations correctly describe signal and background kinematics and detector response after all selection requirements.
    Required for background subtraction and signal efficiency estimation in any LHC analysis of this type.
  • domain assumption Systematic uncertainties are correctly estimated and uncorrelated in the manner assumed by the statistical model.
    Central to the quoted total uncertainties and the 5.8σ exclusion.

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discussion (0)

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