Recognition: unknown
Measurement of the W-boson production cross-sections in pp collisions at sqrt{s} = 13 TeV in the forward region
Pith reviewed 2026-05-10 14:17 UTC · model grok-4.3
The pith
LHCb measures the W+ and W- boson production cross sections in the forward region at 13 TeV to be 1754 pb and 1178 pb respectively, agreeing with NNLO predictions.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The integrated production cross-sections are measured to be σ(W+ → μ+ν) = 1754.2 ± 1.5 ± 11.9 ± 35.1 pb and σ(W- → μ-ν̄) = 1178.1 ± 1.3 ± 9.7 ± 23.6 pb, where uncertainties are statistical, systematic, and due to luminosity, respectively. These values are obtained in the specified muon kinematic range and are found to be in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics, representing a significant improvement in precision over previous measurements in this regime.
What carries the argument
Selection and background subtraction of W → μν decays in the forward pseudorapidity acceptance of LHCb, normalized to the recorded integrated luminosity of 5.1 fb^{-1}.
If this is right
- The measured values provide a more precise test of next-to-next-to-leading order perturbative QCD calculations for W boson production in forward kinematics.
- They supply improved experimental constraints on parton distribution functions at low momentum fractions probed in the forward region.
- The higher precision establishes a stronger reference point for comparing against future LHC data sets collected at the same or higher energies.
- Agreement with theory supports the validity of Standard Model predictions for electroweak processes under these conditions.
Where Pith is reading between the lines
- These forward-region results can be combined with central-rapidity measurements from ATLAS and CMS to tighten global constraints on proton parton densities across a broader kinematic range.
- Any statistically significant deviation from the predicted cross sections in higher-luminosity data could indicate contributions from physics beyond the Standard Model.
- The analysis methods developed for isolating the muon decay channel in the forward region may be adapted to measure associated production or other vector-boson processes at LHCb.
Load-bearing premise
The absolute scale of the cross sections depends on the accuracy of the luminosity determination for the data sample, so any overall bias in that normalization would scale both reported values directly.
What would settle it
An independent analysis or new data set that yields cross sections lying outside the combined total uncertainties of the quoted values while disagreeing with the NNLO predictions would falsify the claimed agreement.
Figures
read the original abstract
A precision measurement of the $W$-boson production cross-section is performed using the $W \to \mu\nu$ decay channel, based on a sample of proton-proton collision data collected by the LHCb experiment at $\sqrt{s}$ = 13 TeV and corresponding to an integrated luminosity of 5.1 $fb^{-1}$. The cross-section is measured for muons with transverse momentum between 25 and 55 GeV and pseudorapidity between 2.0 and 4.5. The integrated production cross-sections of $W$ bosons are measured to be $$ \begin{array}{lcl} \sigma_{W^+ \to \mu^+\nu} &=& 1754.2 \pm 1.5 \pm 11.9 \pm 35.1\text{ pb} \\ \sigma_{W^- \to \mu^-\bar{\nu}} &=& 1178.1 \pm 1.3 \pm 9.7 \pm 23.6\text{ pb} \end{array} $$ where uncertainties are statistical, systematic, and due to the luminosity determination, respectively. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. This measurement is significantly more precise than previous results in this kinematic regime.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents a precision measurement of the W-boson production cross-sections in the forward region using the W → μν decay channel in pp collisions at √s = 13 TeV with the LHCb experiment. Based on 5.1 fb^{-1} of integrated luminosity, the fiducial cross-sections (25 < p_T < 55 GeV, 2.0 < η < 4.5) are reported as σ(W^+ → μ^+ν) = 1754.2 ± 1.5 ± 11.9 ± 35.1 pb and σ(W^- → μ^-ν̄) = 1178.1 ± 1.3 ± 9.7 ± 23.6 pb, where the uncertainties are statistical, systematic, and luminosity, respectively. The results are stated to agree with NNLO pQCD predictions and to be significantly more precise than previous measurements in this kinematic regime.
Significance. If the result holds, this provides a high-precision benchmark for NNLO pQCD calculations in the forward acceptance, where data are sensitive to parton distributions at large x. The explicit separation of statistical, systematic, and luminosity uncertainties, together with the direct comparison to theory evaluated in the identical fiducial volume, are strengths that enhance the result's utility for PDF constraints and theoretical validation. The measurement improves substantially on prior precision in this region.
minor comments (1)
- [Abstract] The cross-section results in the abstract are presented in an array; separate aligned equations would improve readability.
Simulated Author's Rebuttal
We thank the referee for their positive assessment of the manuscript, the recognition of its precision and utility for PDF constraints, and the recommendation to accept. No major comments were raised in the report.
Circularity Check
No significant circularity; direct experimental measurement
full rationale
This paper reports a standard fiducial cross-section measurement of W → μν production in the LHCb forward acceptance using 5.1 fb⁻¹ of 13 TeV pp data. The central results are obtained by selecting signal candidates, subtracting backgrounds, applying efficiency corrections (determined from simulation validated with data-driven methods), and normalizing to the measured integrated luminosity. No load-bearing step in the analysis chain reduces by construction to a fitted parameter, self-citation, or ansatz imported from prior work by the same authors. The quoted agreement with NNLO pQCD predictions is an external comparison performed after the measurement, not part of the derivation. The paper is self-contained against external benchmarks (luminosity, detector response) and exhibits none of the enumerated circularity patterns.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption Standard model electroweak and QCD interactions govern W production and decay
- domain assumption Detector response and efficiencies can be modeled from simulation and control samples
Reference graph
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discussion (0)
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