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CMS measures the Higgs boson mass at 125.13 GeV in the diphoton channel with 138 fb^{-1} of 13 TeV data, tightening the combined diphoton result to 125.06 GeV.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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T0 review · grok-4.5

2026-07-31 08:45 UTC pith:ZHJQNIZT

load-bearing objection Solid CMS Run-2 diphoton mass result that halves the previous systematic by fixing the electron–photon scale transfer; the residual Z→μμγ limitation is real but already the quoted leading uncertainty.

arxiv 2607.28396 v1 pith:ZHJQNIZT submitted 2026-07-30 hep-ex

A measurement of the Higgs boson mass in the diphoton decay channel in proton-proton collisions at sqrt{s} = 13 TeV

CMS Collaboration This is my paper
classification hep-ex PACS 14.80.Bn13.85.Qk29.40.Vj
keywords Higgs boson massdiphoton decayCMSphoton energy scaleECAL calibration13 TeVZ to mumu gamma
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

This paper reports a precision measurement of the Higgs boson mass using its rare diphoton decay in proton-proton collisions at 13 TeV. With the full 2016–2018 CMS data set of 138 inverse femtobarns, and after a refined electromagnetic calorimeter calibration that anchors the photon energy scale to Z-boson decays, the mass is found to be 125.13 plus or minus 0.15 GeV. Combining with the earlier 7 and 8 TeV diphoton result yields 125.06 plus or minus 0.14 GeV. The work matters because the Higgs mass is a free parameter of the Standard Model that enters electroweak precision fits and vacuum-stability calculations; a sub-200 MeV determination in a clean, fully reconstructible final state sharpens those tests.

Core claim

Using 138 fb^{-1} of 13 TeV proton-proton collision data recorded by CMS, the Higgs boson mass in the diphoton decay channel is measured to be m_H = 125.13 ± 0.15 GeV (0.10 GeV statistical, 0.12 GeV systematic). Combination with the independent CMS 7 and 8 TeV diphoton measurement gives m_H = 125.06 ± 0.14 GeV (0.09 GeV statistical, 0.11 GeV systematic).

What carries the argument

A three-stage photon energy calibration: electron scales from Z o ee, a simulation-based uniformity correction for radiation damage differences between electrons and photons, and residual photon-versus-electron scale corrections extracted directly from final-state-radiation photons in Z oμμγ events; these corrected energies enter a simultaneous binned likelihood fit of the diphoton mass spectrum across categories defined by a signal-to-background BDT and expected mass resolution.

Load-bearing premise

The residual difference between photon and electron energy response after the simulation-based radiation-damage correction is fully captured by the Z oμμγ corrections in twenty coarse bins of eta, shower shape and transverse energy, plus a constant high-energy non-linearity uncertainty.

What would settle it

A statistically independent high-statistics sample of photons near 60 GeV (for example from radiative Z or W decays or from a future larger Z oμμγ data set) that yields a photon energy scale inconsistent with the applied corrections at a level larger than the assigned 0.15–0.25 percent high-ET uncertainty would falsify the mass central value and its systematic error.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • The combined CMS diphoton mass of 125.06 ± 0.14 GeV becomes a high-precision input to global electroweak fits that constrain the W-boson mass and top-quark mass consistency.
  • The reduced systematic uncertainty (nearly a factor of two relative to the previous CMS 13 TeV diphoton result) strengthens future combinations with the four-lepton channel and with ATLAS.
  • The same refined ECAL calibration and photon-scale procedure can be reused for other precision diphoton measurements (cross sections, differential distributions, and interference studies).
  • The assigned 27 MeV interference uncertainty between gluon-fusion signal and continuum background sets a floor that must be improved or measured directly for still-higher-precision mass determinations.

Where Pith is reading between the lines

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

  • If the high-ET non-linearity term is the dominant remaining scale uncertainty, a dedicated high-energy photon calibration sample (e.g., from future high-luminosity running) could push the total systematic below 100 MeV.
  • The close numerical agreement between this diphoton result and the CMS four-lepton mass suggests that a full CMS combination of both channels with the new calibration would already rival the ATLAS combined precision.
  • The discrete-profiling background treatment and S/√B-plus-resolution categorization are portable to other narrow-resonance searches in diphoton final states at the LHC.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 5 minor

Summary. The paper reports a measurement of the Higgs boson mass in the H→γγ channel with the full CMS Run 2 data set (138 fb⁻¹ at √s=13 TeV). A three-stage ECAL energy calibration is used: electron scale and resolution from Z→ee, a simulation-based uniformity correction for radiation-damage differences between electrons and photons, and residual photon-scale corrections from Z→μμγ FSR photons in 20 (η, R9, ET) bins. Events are classified with a diphoton BDT (backgrounds with misidentified jets taken from data control samples) into five categories; signal shapes are sums of Voigtians parameterized in m_H and the background is discrete-profiled from data. The result is m_H=125.13±0.15 GeV=125.13±0.10 (stat)±0.12 (syst) GeV; combination with the earlier CMS 7+8 TeV diphoton measurement yields 125.06±0.14 GeV. Leading systematics (Table 1) are the Z→μμγ statistics (74 MeV), muon momentum scale (55 MeV), high-ET non-linearity (54 MeV), and ggH–continuum interference (27 MeV).

Significance. This is a high-precision SM input measurement. The refined calibration roughly halves the systematic uncertainty relative to the previous CMS diphoton result and brings the total uncertainty into line with the best ATLAS γγ and CMS 4ℓ determinations. The three-stage e/γ calibration strategy, ET-dependent resolution corrections, data-driven BDT background modeling, and explicit interference systematic are concrete technical advances that strengthen the result. The measurement is compatible with existing ATLAS and CMS values and will enter global EW fits and vacuum-stability discussions. Strengths include a full nuisance-parameter treatment, independent control samples for calibration, and a free signal-strength parameter μ.

minor comments (5)
  1. [§5.1] §5.1 and Fig. 2: the photon energy-scale corrections are shown only as functions of |η| in two ET and two R9 bins. A short statement of the typical correction size (or a table of the 20 values) would help the reader judge the residual e/γ difference that remains after the uniformity step.
  2. [§8.2] §8.2 Residual non-linearity: the 0.15%/0.25% uncertainty is assigned only for ET>80 GeV and set to zero below. Given that the mean photon energy in H→γγ is ~60 GeV, a one-sentence justification that the constant fit below 80 GeV shows no slope (or a cross-check with the Z→ee high-ET tail) would make the coverage argument more transparent.
  3. [Fig. 5] Fig. 5: the vertical scale is labeled “Energy scale uncertainty ×10³”; clarifying whether the plotted quantities are absolute fractional uncertainties (δE/E) would avoid any ambiguity.
  4. [§9] §9: the compatibility of the 13 TeV result with the previous CMS 7+8 TeV diphoton measurement is quoted as 1.2σ under the assumption of zero correlation. A brief remark on why residual common systematics (e.g., theoretical interference modeling) can be neglected would be useful.
  5. [Abstract] Abstract and §10: the combined result is written “125.06±0.14 GeV=125.06±0.09 (stat)±0.11 (syst) GeV”. The arithmetic is correct, but stating the quadrature sum explicitly once would aid quick reading.

Circularity Check

0 steps flagged

No circularity: experimental mass extraction from independent collision data and control-sample calibrations

full rationale

This is a standard HEP mass measurement, not a first-principles derivation. m_H is extracted by a simultaneous binned likelihood fit to the observed diphoton mass spectra in data categories (§7, §9); the reported value is the fit result, not a quantity redefined from its inputs. Photon energy scale and resolution corrections are derived from independent control samples (Z→ee and Z→μμγ) that do not contain the Higgs signal (§5.1), with residual systematics quantified and propagated (§8, Table 1). The signal model is built from simulation at fixed generated masses and interpolated; the SM width Γ_H = 4.1 MeV is an external fixed input, and the signal strength μ is left free—neither forces m_H by construction. Background shapes are profiled from data sidebands via the discrete profiling method. The 7+8 TeV combination treats independent datasets as uncorrelated. No step reduces a claimed prediction to a fitted input, self-definition, or load-bearing unverified self-citation. Score 0 is appropriate.

Axiom & Free-Parameter Ledger

5 free parameters · 5 axioms · 0 invented entities

The result rests on standard LHC experimental assumptions (detector response, SM production modes for normalization of categories, fixed SM Higgs width) plus the specific calibration hierarchy introduced in this analysis. No new physical entities are postulated. The free parameters are the nuisance parameters of the energy-scale and resolution corrections, which are constrained by control samples rather than by the Higgs peak itself.

free parameters (5)
  • Photon energy-scale residual corrections (20 bins in |η|, R9, ET) = 0.990–1.000 (bin-dependent)
    Multiplicative scale factors (0.990–1.000) derived from Z→μμγ and applied to data; their statistical and systematic uncertainties dominate the final systematic error on m_H.
  • Electron energy-scale and resolution corrections (iterative, multi-dimensional) = period- and bin-dependent
    Five-step corrections from Z→ee that set the absolute energy scale before the photon residual step; resolution smearing up to ~2%.
  • High-ET non-linearity uncertainty = 0.15% / 0.25%
    Assigned 0.15% (barrel) / 0.25% (endcap) for ET>80 GeV when Z→μμγ statistics are insufficient for fine binning.
  • Interference mass-shift systematic = 27 MeV
    Difference between peak position with and without ggH–continuum interference, taken entirely as a 27 MeV systematic.
  • Signal strength μ = 0.95 ± 0.09
    Floated in the mass fit; best-fit value 0.95 ± 0.06 (stat) ± 0.07 (syst).
axioms (5)
  • domain assumption The SM Higgs width is fixed to Γ_H = 4.1 MeV at m_H = 125 GeV.
    Stated in §7.1 and §9; the lineshape Voigtians use this external LHC Higgs Working Group value.
  • domain assumption Photon and electron showers differ by a calculable radiation-damage-induced light-collection non-uniformity that can be corrected by GEANT4 + FLUKA + LITRANI simulation (the ‘uniformity’ correction).
    Stage-2 calibration (§5.1); applied only to high-R9 photons.
  • domain assumption Background m_γγ shapes in each category are adequately described by the discrete-profiling envelope of exponential, Bernstein, Laurent and power-law families.
    §7.2; choice treated as a discrete nuisance following Dauncey et al.
  • domain assumption Production-mode cross sections and the H→γγ branching fraction follow LHC Higgs Working Group recommendations for category normalizations.
    §4; used to build the composite signal model.
  • standard math Standard maximum-likelihood asymptotic formulae and profile-likelihood intervals are valid for the observed event counts.
    §9 cites Cowan et al. and the CMS COMBINE tool.

pith-pipeline@v1.2.0-daily-grok45 · 45087 in / 3264 out tokens · 62720 ms · 2026-07-31T08:45:47.696136+00:00 · methodology

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read the original abstract

A measurement of the Higgs boson mass in the diphoton decay channel is performed using proton-proton collision data at a center-of-mass energy of 13 TeV. The data set recorded with the CMS detector between 2016 and 2018 is used, corresponding to an integrated luminosity of 138 fb$^{-1}$. A refined detector calibration and new analysis techniques are employed to improve the precision of the results compared to earlier measurements. The Higgs boson mass is measured to be $m_\mathrm{H}$ = 125.13 $\pm$ 0.15 GeV = 125.13 $\pm$ 0.10 (stat) $\pm$ 0.12 (syst) GeV. In addition, a combination with the mass measurement at center-of-mass energies of 7 and 8 TeV in the diphoton final state is performed resulting in $m_\mathrm{H}$ = 125.06 $\pm$ 0.14 GeV = 125.06 $\pm$ 0.09 (stat) $\pm$ 0.11 (syst) GeV.

Figures

Figures reproduced from arXiv: 2607.28396 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: Comparison of the dielectron invariant mass distribution in data and simulation for [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Photon energy scale corrections applied to the data as functions of [PITH_FULL_IMAGE:figures/full_fig_p009_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Comparison of the three-body invariant mass distribution in data and simulation for [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Signal model for the analysis category with the best mass resolution (left), and for all [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Uncertainties in the energy scale as a function of [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Data and combined signal and background model fit for all analysis categories, un [PITH_FULL_IMAGE:figures/full_fig_p016_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Likelihood scans of the Higgs boson mass measured in the H [PITH_FULL_IMAGE:figures/full_fig_p016_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Summary of the ATLAS and CMS Higgs boson mass measurements using the dipho [PITH_FULL_IMAGE:figures/full_fig_p017_8.png] view at source ↗

discussion (0)

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