Measurement of the cross-section for the production of a $W$ boson in association with $b$-jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration

arxiv: 2605.31205 · v1 · pith:GV3KRTW4new · submitted 2026-05-29 · ✦ hep-ex

Measurement of the cross-section for the production of a W boson in association with b-jets in pp collisions at sqrt{s}=13 TeV with the ATLAS detector

ATLAS Collaboration This is my paper

Pith reviewed 2026-06-28 19:57 UTC · model grok-4.3

classification ✦ hep-ex

keywords W bosonb-jetscross-section measurementfiducial region13 TeV collisionsNLO QCD

0 comments

The pith

The fiducial cross-section for W boson plus b-jets production at 13 TeV is measured as 16.6 pb and matches the NLO QCD prediction.

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

The paper measures the production cross-section of a W boson with one or two b-jets in proton-proton collisions at 13 TeV. Data corresponding to 140 fb inverse are analyzed in the electron and muon decay channels of the W boson. Differential cross-sections are presented versus b-jet transverse momentum in a fiducial region defined by basic lepton and jet kinematics. The averaged fiducial cross-section is reported as 16.6 plus or minus 1.9 pb, consistent with the next-to-leading-order QCD prediction of 16.8 plus or minus 2.3 pb. This achieves approximately twice the relative precision of the prior measurement at 7 TeV.

Core claim

The production cross-section of a W boson associated with b-jets is measured in a fiducial phase space at 13 TeV, yielding an averaged value of 16.6 ± 1.9 pb that agrees with the NLO QCD prediction within uncertainties.

What carries the argument

The fiducial cross-section extracted after correcting for detector effects using unfolding and b-jet identification efficiencies modeled in simulation.

If this is right

The result supports next-to-leading-order QCD calculations for W plus heavy-flavor jet production at the higher collision energy.
Differential spectra versus b-jet transverse momentum test the modeling of heavy-flavor production in theoretical simulations.
The factor-of-two improvement in precision reduces the uncertainty on this standard model process for use in other analyses.

Where Pith is reading between the lines

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

The measurement at 13 TeV can constrain b-quark parton distribution functions when combined with other data.
The same fiducial selection and unfolding approach could be applied to measure W plus charm-jet production for comparison.
Consistency at current precision leaves room for small new-physics effects to appear only with higher luminosity or more differential bins.

Load-bearing premise

The unfolding procedure and b-jet identification efficiencies are accurately modeled by simulation.

What would settle it

A measured cross-section differing from the predicted 16.8 pb by more than the combined experimental and theoretical uncertainties, or mismatch in the differential b-jet pT distributions, would challenge the reported consistency.

read the original abstract

This paper presents a measurement of the production cross-section of a $W$ boson associated with one or two jets, where at least one jet originates from a $b$-quark. The data are collected with the ATLAS detector at the LHC in proton-proton collisions at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 140 fb$^{\text -1}$. Differential cross-sections are presented as a function of the transverse momentum of the $b$-jet for both the electron and muon decay modes of the $W$ boson. The results corrected for all detector effects are presented in a fiducial region defined with basic lepton and jet kinematics, and compared with theoretical predictions. The averaged fiducial cross-section of $W+b$-jets for the electron and muon channels is measured to be $16.6\pm1.9$ pb, which is consistent with the next-to-leading-order QCD prediction of $16.8\pm2.3$ pb. The relative precision of this measurement is improved by approximately a factor of two compared with the previous ATLAS measurement at $\sqrt{s}=7$ TeV.

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.

Desk Editor's Note private letter to a colleague

Standard ATLAS update on W+b-jets at 13 TeV that doubles prior precision and agrees with NLO, but still rests on simulation for the key corrections.

read the letter

Colleague,

This paper updates the W+b-jets fiducial cross-section to 13 TeV with the full 140 fb^{-1} Run 2 dataset. The averaged result comes in at 16.6 ± 1.9 pb, consistent with the NLO prediction of 16.8 ± 2.3 pb, and the precision is roughly twice as good as the old 7 TeV measurement. They also show differential distributions in b-jet pT for the electron and muon channels.

The work uses established ATLAS methods to correct to a fiducial region defined by basic lepton and jet cuts, then compares directly to theory. That consistency check and the factor-of-two improvement are the concrete advances.

The soft spot is the unfolding and b-tagging efficiency corrections, which rely on simulation modeling. The headline number is only obtained after these steps, and the abstract gives no explicit data-driven cross-checks on the migration matrices or tagging rates. If the full paper has those validations, the result strengthens; otherwise that remains the part most open to a data-MC mismatch shifting the central value.

This is useful for groups tuning heavy-flavor generators or estimating backgrounds in top and Higgs analyses. It is not a big conceptual step, but these measurements accumulate value for QCD validation at the LHC.

I would send it to peer review. The experimental setup is standard and the community needs the updated numbers published with proper scrutiny on the corrections.

Referee Report

1 major / 0 minor

Summary. This manuscript presents a measurement of the fiducial cross-section for W boson production associated with b-jets in proton-proton collisions at 13 TeV using the ATLAS detector and 140 fb^{-1} of data. Differential cross-sections are given as a function of b-jet transverse momentum in the electron and muon channels. The averaged fiducial cross-section is reported as 16.6 ± 1.9 pb, consistent with the next-to-leading-order QCD prediction of 16.8 ± 2.3 pb, representing approximately a factor of two improvement in relative precision over the previous ATLAS result at 7 TeV.

Significance. If the result holds after full validation, this provides a more precise experimental benchmark for testing perturbative QCD calculations of heavy-flavor production in association with vector bosons. The improved precision relative to the 7 TeV measurement strengthens constraints on parton distribution functions and Monte Carlo modeling relevant to LHC phenomenology.

major comments (1)

[Abstract] Abstract: The reported fiducial cross-section of 16.6±1.9 pb (and its consistency with the NLO prediction) is obtained only after simulation-based unfolding and b-tagging efficiency corrections. The abstract provides no mention of data-driven validation of these modeling assumptions in the fiducial region; any data-MC discrepancy in tagging rates or migration matrices would shift the corrected value and undermine the central comparison.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and constructive comment on the manuscript. We address the point raised below.

read point-by-point responses

Referee: [Abstract] Abstract: The reported fiducial cross-section of 16.6±1.9 pb (and its consistency with the NLO prediction) is obtained only after simulation-based unfolding and b-tagging efficiency corrections. The abstract provides no mention of data-driven validation of these modeling assumptions in the fiducial region; any data-MC discrepancy in tagging rates or migration matrices would shift the corrected value and undermine the central comparison.

Authors: The abstract is intentionally concise. The full manuscript describes the data-driven b-tagging efficiency calibration (using control samples in data) and the validation of the unfolding procedure (including migration matrices) via data control regions, with good data-MC agreement shown in the relevant sections. These steps ensure the corrections are not purely simulation-based. We will revise the abstract to include a brief reference to the data-driven validations supporting the result. revision: yes

Circularity Check

0 steps flagged

No circularity: cross-section extracted from data and compared to independent theory.

full rationale

The paper measures the W+b-jets fiducial cross-section directly from 13 TeV collision data (140 fb^{-1}), applies standard unfolding and efficiency corrections based on simulation, and compares the result (16.6±1.9 pb) to an external NLO QCD prediction (16.8±2.3 pb). No derivation chain, equation, or parameter fit reduces the reported measurement to its own inputs by construction. The comparison to theory is external and independent; prior ATLAS results at 7 TeV are cited only for context on precision improvement, not as load-bearing justification. Unfolding assumptions are standard experimental procedure and do not match any enumerated circularity pattern.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The measurement relies on standard experimental assumptions in high-energy physics regarding luminosity determination and Monte Carlo modeling of detector response; no free parameters or invented entities are introduced in the abstract.

axioms (2)

domain assumption The integrated luminosity of the data sample is known to sufficient precision for the quoted uncertainty.
The cross-section normalization depends on this value stated as 140 fb^{-1}.
domain assumption Monte Carlo simulation accurately models detector effects for correction to the fiducial particle-level cross-section.
The abstract states results are corrected for all detector effects.

pith-pipeline@v0.9.1-grok · 5744 in / 1408 out tokens · 33719 ms · 2026-06-28T19:57:33.506036+00:00 · methodology

discussion (0)

Reference graph

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