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arxiv: 2606.26832 · v1 · pith:AQCPECNNnew · submitted 2026-06-25 · ✦ hep-ex · physics.ins-det

Precision luminosity measurement in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the Large Hadron Collider

CMS Collaboration This is my paper

Pith reviewed 2026-06-26 01:58 UTC · model grok-4.3

classification ✦ hep-ex physics.ins-det
keywords integrated luminosityluminosity measurementCMS detectorLHC13 TeVproton-proton collisionsprecision measurementZ boson validation
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The pith

CMS measures integrated luminosity to 0.73% precision for the full 13 TeV proton data set

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

The paper establishes a new benchmark for integrated luminosity determination in proton-proton collisions at 13 TeV. Multiple independent monitors are calibrated through beam-separation scans and their long-term stability is verified using Z boson production rates as a reference process. The resulting combined uncertainty reaches 0.73% across the entire collected data set. A sympathetic reader would see this as tightening the link between delivered collisions and observed events, which directly improves the accuracy of any cross-section or rate comparison with theory.

Core claim

Calibration of several luminosity monitors via beam-separation techniques, followed by validation of their stability against Z boson rates, produces a total integrated luminosity uncertainty of 0.73% for the complete 13 TeV data set, representing the most precise such measurement at a bunched-beam hadron collider.

What carries the argument

Multiple independent luminosity monitors whose calibrations are obtained from beam-separation scans and whose stability is cross-checked with Z boson production rates.

If this is right

  • Cross-section measurements for standard model processes carry a smaller systematic uncertainty from luminosity.
  • Searches for new physics gain sensitivity because the expected event rates are known more precisely.
  • The full 13 TeV data set can be reanalyzed with reduced luminosity-related errors.
  • A documented sub-percent precision baseline now exists for planning luminosity measurements in the high-luminosity LHC phase.

Where Pith is reading between the lines

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

  • The same combination of beam-separation calibration and Z validation could be tested at other hadron colliders to reach comparable relative precision.
  • Future detector upgrades might target still lower uncertainties by refining the same reference processes rather than introducing entirely new monitors.
  • Analyses that combine multiple data-taking years will now be limited by other systematics sooner than by luminosity.

Load-bearing premise

Z boson production rates act as an independent, luminosity-independent reference that can confirm the monitors remain stable over time.

What would settle it

A statistically significant mismatch between the luminosity values reported by the monitors and the luminosity inferred directly from the observed Z boson event yield would show the claimed 0.73% precision cannot be maintained.

Figures

Figures reproduced from arXiv: 2606.26832 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: An illustration of the vdM fit procedure for the HFET method in the 2017 vdM fill [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Beam positions in x and y for both LHC beams as functions of time during LHC fills 6016 (upper) and 6868 (lower), as measured with the DOROS BPMs with 1 s time granularity. Time is indicated relative to the first included data point. The beginning and end of individual scans are indicated by vertical lines. Each vdM-like scan pair consists of a scan along the x axis and one along the y axis, and is labeled… view at source ↗
Figure 3
Figure 3. Figure 3: Beam-beam deflection (left) and dynamic- [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Difference between nominal and measured beam separation per scan step as a func [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Visible cross section estimates for the HFET luminometer with all corrections applied [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Residual orbit drift corrections to the single-beam positions as a function of the scan [PITH_FULL_IMAGE:figures/full_fig_p015_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Length scale factors αTR/NOM obtained with the direct (blue squares and upward tri￾angles) and two-step (orange points and downward triangles) approaches for 2017 (left) and 2018 (right). Results are shown separately for cLS and vLS scans, using either the DOROS (filled triangles) or arc (empty triangles) BPMs, as well as their combination (squares and circles). For the direct approach, the error bars repr… view at source ↗
Figure 8
Figure 8. Figure 8: Nonfactorization estimates for 2017 (left) and 2018 (right) using the luminous region [PITH_FULL_IMAGE:figures/full_fig_p019_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Per BCID σvis values in the first scan in 2017 (left) and 2018 (right) as measured for the PLT luminometer. The error bars represent the uncertainty propagated from the fit. scale. The standard deviation of the scans averaged over the four detectors (0.26% in 2017 and 0.27% in 2018) is taken to be the scan-to-scan reproducibility uncertainty [PITH_FULL_IMAGE:figures/full_fig_p021_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: The relative deviation of the BCID-averaged [PITH_FULL_IMAGE:figures/full_fig_p022_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Relative differences of the luminosity measured by the HFET, HFOC, PLT, and PCC [PITH_FULL_IMAGE:figures/full_fig_p022_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: The decrease in efficiency as a consequence of HFET aging in 2018 as measured [PITH_FULL_IMAGE:figures/full_fig_p025_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: The number of clusters in the pixel tracker per event is shown as a function of the [PITH_FULL_IMAGE:figures/full_fig_p026_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: The luminosity-weighted average of the measured residual nonlinearity between the [PITH_FULL_IMAGE:figures/full_fig_p027_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: The ratio of the luminosity measured by HFET, HFOC, PLT, and PCC to their mean [PITH_FULL_IMAGE:figures/full_fig_p028_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: The luminosity as determined by Z boson production rates divided by the reference [PITH_FULL_IMAGE:figures/full_fig_p030_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: The relative uncertainty and the shifts of the luminosity values before and after the [PITH_FULL_IMAGE:figures/full_fig_p031_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: The post-fit ratio of the luminosity based on measured Z boson production rates [PITH_FULL_IMAGE:figures/full_fig_p032_18.png] view at source ↗
read the original abstract

Discovering new fundamental physics requires spotting subtle deviations between theoretical predictions and experimental data. This delicate comparison hinges on the precise knowledge of the integrated luminosity, the measure of how many particle interactions were actually delivered by the collider. Here, we report a landmark measurement of the integrated luminosity by the Compact Muon Solenoid (CMS) experiment for proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN Large Hadron Collider (LHC). By calibrating multiple independent monitors through specialized beam-separation techniques and rigorously validating their long-term stability against well-understood Z boson production rates, we comprehensively map and minimize systematic uncertainties. Combining the findings yields a total integrated luminosity precision of 0.73% for the entire data set. This marks the most precise luminosity measurement ever achieved at a bunched-beam hadron collider. Crossing the sub-percent precision threshold per data taking year fundamentally sharpens our ability to test the standard model and establishes a vital baseline for the upcoming High-Luminosity LHC era.

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 reports a precision determination of the integrated luminosity for CMS proton-proton collisions at 13 TeV, obtained by calibrating multiple luminosity monitors via beam-separation (van der Meer) scans and validating their long-term stability using Z boson production rates. The combined result is quoted as 0.73% total uncertainty for the full dataset, presented as the most precise such measurement at a bunched-beam hadron collider.

Significance. If the quoted uncertainty is shown to be free of circular dependence, the result would be a benchmark for precision LHC physics, sharpening Standard Model tests and providing a reference for HL-LHC luminosity calibration. The multi-monitor calibration strategy and systematic mapping are positive features when independence of the validation sample is demonstrated.

major comments (1)
  1. [Abstract] Abstract: the 0.73% precision claim rests on Z-boson-rate validation of long-term stability after van-der-Meer calibration. The text states only that the rates are 'well-understood' and supplies no explicit statement that the reference Z sample (acceptance-corrected rate or cross section) is normalized with a luminosity source independent of the monitors under test. This independence is load-bearing for whether the stability check can bound the dominant systematic; without it the combined uncertainty may be underestimated.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading of the manuscript and for highlighting the need for explicit clarification on the independence of the Z-boson validation sample. We address the single major comment below.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the 0.73% precision claim rests on Z-boson-rate validation of long-term stability after van-der-Meer calibration. The text states only that the rates are 'well-understood' and supplies no explicit statement that the reference Z sample (acceptance-corrected rate or cross section) is normalized with a luminosity source independent of the monitors under test. This independence is load-bearing for whether the stability check can bound the dominant systematic; without it the combined uncertainty may be underestimated.

    Authors: We agree that the abstract does not contain an explicit statement regarding the independence of the Z-sample normalization. The full manuscript describes the Z rates as well-understood from a combination of theoretical predictions and prior measurements performed with luminosity determinations independent of the 13 TeV monitors under test. However, because this independence is not stated in the abstract, we will revise the abstract to include a concise clause making the independence explicit. This change will directly address the concern that the stability validation could otherwise appear circular. revision: yes

Circularity Check

0 steps flagged

No circularity in derivation chain

full rationale

The provided abstract describes absolute calibration of luminosity monitors via beam-separation scans followed by stability validation against independently well-understood Z boson production rates. No equations, fitted parameters, or self-citations are exhibited that reduce the final 0.73% precision result to the inputs by construction. The Z reference is presented as external and theory-driven, rendering the chain self-contained against external benchmarks with no load-bearing reduction to self-defined quantities.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Only the abstract is available, so the ledger is restricted to assumptions explicitly named in the text. No free parameters, invented entities, or additional axioms are stated.

axioms (2)
  • domain assumption Z boson production rates are well-understood and independent of the luminosity measurement being validated
    Abstract states validation against 'well-understood Z boson production rates'
  • domain assumption Beam-separation techniques yield accurate absolute calibration of the monitors
    Abstract describes calibration through specialized beam-separation techniques

pith-pipeline@v0.9.1-grok · 5713 in / 1219 out tokens · 26814 ms · 2026-06-26T01:58:25.282650+00:00 · methodology

discussion (0)

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Reference graph

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