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arxiv: 2510.00160 · v2 · pith:WENGEKCVnew · submitted 2025-09-30 · ✦ hep-ex

Measurement of the dineutrino system kinematic variables in dileptonic top quark pair production in proton-proton collisions atsqrt{s} = 13 TeV

CMS Collaboration This is my paper

Pith reviewed 2026-05-22 12:26 UTC · model grok-4.3

classification ✦ hep-ex
keywords top quarkdileptondineutrino systemdifferential cross sectionunfoldingLHCCMS experimentstandard model
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The pith

Differential cross sections for top quark pair production match standard model predictions in dineutrino kinematic variables.

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

The paper measures differential cross sections in the dilepton decay channel of top quark pairs, focusing on the kinematics of the two neutrinos that are not directly detected. It extracts distributions for the transverse momentum of the dineutrino system and the smallest azimuthal angle between that momentum vector and the observed leptons, including two-dimensional bins. Data from 138 inverse femtobarns of proton-proton collisions at 13 TeV are unfolded to the particle level with an unregularized least squares technique. The results align with both theoretical calculations and Monte Carlo simulations of the standard model. This agreement provides a check on the modeling of top quark production and decay processes at the LHC.

Core claim

Differential top quark pair production cross sections are measured in the dilepton final states e+e−, μ+μ−, and e±μ∓, as a function of kinematic variables of the two-neutrino system: the transverse momentum pTνν of the dineutrino system, the minimum distance in azimuthal angle between pTνν and leptons, and in two dimensions in bins of both observables. The measurements are performed using CERN LHC proton-proton collisions at √s = 13 TeV, recorded by the CMS detector between 2016 and 2018, corresponding to an integrated luminosity of 138 fb−1. The measured cross sections are unfolded to the particle level using an unregularized least squares method. Results are compared with predictions by 0.

What carries the argument

Unfolding detector-level distributions to the particle level via an unregularized least squares method applied to the transverse momentum and azimuthal separation observables of the dineutrino system.

If this is right

  • The unfolded cross sections validate the accuracy of Monte Carlo simulations for neutrino kinematics in top pair events.
  • These measurements can serve as benchmarks for improving theoretical predictions of top quark production.
  • Agreement in the two-dimensional distributions confirms that correlations between momentum and angular variables are correctly modeled.
  • Future analyses can use these results to search for subtle deviations that might indicate new physics.

Where Pith is reading between the lines

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

  • Similar unfolding approaches could be applied to other LHC processes involving missing transverse energy to extract particle-level information.
  • The focus on dineutrino variables highlights how invisible particles' kinematics can be inferred from visible decay products in complex events.
  • Extending these measurements to higher center-of-mass energies or with more data could tighten constraints on parton distribution functions.

Load-bearing premise

The Monte Carlo simulations used both for unfolding the detector-level distributions to particle level and for comparison with data accurately reproduce the experimental acceptance, resolution, and underlying physics processes in the dilepton final state.

What would settle it

Observation of a statistically significant mismatch between the unfolded data and the predicted cross sections in one or more kinematic bins would falsify the agreement with the standard model.

Figures

Figures reproduced from arXiv: 2510.00160 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: In the left diagram, the SM tt production process is sketched, whereas the right di￾agram shows the production of a hypothetical top squark pair, et 1 et 1 , with both top squarks decaying to a top quark and a neutralino, χe 0 1 . This analysis focuses on signatures, where both of the W bosons decay leptonically. A precise measurement of the dineutrino system in dileptonic tt events requires a good resolu￾… view at source ↗
Figure 2
Figure 2. Figure 2: Observed (black markers) and expected (filled histograms) distributions of leading [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Difference between p miss T,gen. and p miss T,rec. as a function of the p miss T,gen. (upper) and the number of primary vertices (lower) for signal events. The mean difference between the generated and the p miss T,rec. per bin is shown as solid line, while the dashed line shows the standard deviation σ, which corresponds to the resolution. The results for p miss T corrected by the DNN regression (thick li… view at source ↗
Figure 4
Figure 4. Figure 4: Breakdown of the relative uncertainties from experimental (left) and theoretical [PITH_FULL_IMAGE:figures/full_fig_p013_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: The observed (black markers) and simulated distributions of [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Result of the closure test based on simulation accounting for potential BSM contri [PITH_FULL_IMAGE:figures/full_fig_p016_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: The measured differential signal cross sections (black markers) as functions of [PITH_FULL_IMAGE:figures/full_fig_p017_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: The measured normalized differential signal cross sections (black markers) as [PITH_FULL_IMAGE:figures/full_fig_p018_8.png] view at source ↗
read the original abstract

Differential top quark pair production cross sections are measured in the dilepton final states e$^+$e$^-$, $\mu^+\mu^-$, and e$^\pm\mu^\mp$, as a function of kinematic variables of the two-neutrino system: the transverse momentum $p_\mathrm{T}^{\nu\nu}$ of the dineutrino system, the minimum distance in azimuthal angle between $\vec{p}_\mathrm{T}^{\,\nu\nu}$ and leptons, and in two dimensions in bins of both observables. The measurements are performed using CERN LHC proton-proton collisions at $\sqrt{s}$ = 13 TeV, recorded by the CMS detector between 2016 and 2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The measured cross sections are unfolded to the particle level using an unregularized least squares method. Results are compared with predictions by the standard model of particle physics, and found to be in agreement with theoretical calculations as well as Monte Carlo simulations.

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

2 major / 2 minor

Summary. The manuscript reports measurements of differential cross sections for top-quark pair production in the dilepton final states (ee, μμ, eμ) at √s = 13 TeV. The observables are the transverse momentum of the dineutrino system p_T^{νν}, the minimum azimuthal separation Δφ_min between the dineutrino p_T vector and the leptons, and the two-dimensional distribution in these variables. Using 138 fb^{-1} of CMS data collected in 2016–2018, detector-level distributions are unfolded to particle level via an unregularized least-squares method. The unfolded results are compared to Standard Model theoretical calculations and Monte Carlo simulations and reported to be in agreement.

Significance. If the central claim holds, the result supplies a direct experimental constraint on the modeling of neutrino kinematics in dileptonic ttbar events, which is sensitive to higher-order QCD corrections and potential spin correlations. The explicit use of an unregularized unfolding method is a positive feature that avoids regularization-induced bias. The large data set and multi-channel combination add statistical power, and the focus on these specific observables fills a gap in existing differential ttbar measurements.

major comments (2)
  1. [Unfolding section] Unfolding section: The response matrix employed in the unregularized least-squares unfolding is constructed exclusively from Monte Carlo simulation of the signal process. Because the same simulation family is subsequently used for the particle-level comparisons, any residual mismatch between the MC modeling of detector response or neutrino kinematics and reality can propagate into the unfolded cross sections, potentially inflating the apparent agreement. A dedicated closure test or comparison with an independent generator for the response matrix is required to substantiate that the agreement constitutes an independent test rather than a consistency check.
  2. [Results section] Results section (comparison plots and tables): The manuscript states agreement with theoretical calculations and Monte Carlo simulations but does not quantify the level of agreement (e.g., via χ² per degree of freedom or pull distributions) after accounting for the full experimental covariance matrix. Without this, it is difficult to judge whether the reported agreement is statistically meaningful or merely consistent within large uncertainties.
minor comments (2)
  1. [Abstract and Introduction] The abstract and introduction should explicitly reference prior CMS or ATLAS measurements of similar neutrino-related observables in ttbar to place the novelty of the current work in context.
  2. [Figures] Figure captions for the unfolded distributions should state the binning scheme and the integrated luminosity used in each panel for clarity.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough review and valuable suggestions. We address each major comment below and plan to incorporate the recommended improvements in the revised manuscript.

read point-by-point responses

  1. Referee: [Unfolding section] Unfolding section: The response matrix employed in the unregularized least-squares unfolding is constructed exclusively from Monte Carlo simulation of the signal process. Because the same simulation family is subsequently used for the particle-level comparisons, any residual mismatch between the MC modeling of detector response or neutrino kinematics and reality can propagate into the unfolded cross sections, potentially inflating the apparent agreement. A dedicated closure test or comparison with an independent generator for the response matrix is required to substantiate that the agreement constitutes an independent test rather than a consistency check.

    Authors: We appreciate the referee's concern regarding potential bias in the unfolding procedure. The response matrix is indeed derived from the nominal Monte Carlo simulation of the signal process. However, the comparisons at particle level are performed not only with the nominal generator but also with alternative Monte Carlo models and theoretical calculations that employ different modeling of neutrino kinematics and higher-order corrections. To further substantiate the independence of the test, we will add a dedicated closure test in the revised manuscript. Specifically, we will generate pseudo-data using an alternative event generator, unfold it using the nominal response matrix, and verify that the unfolded distributions recover the input particle-level distributions within the expected uncertainties. This will demonstrate that the unfolding does not introduce artificial agreement. revision: yes

  2. Referee: [Results section] Results section (comparison plots and tables): The manuscript states agreement with theoretical calculations and Monte Carlo simulations but does not quantify the level of agreement (e.g., via χ² per degree of freedom or pull distributions) after accounting for the full experimental covariance matrix. Without this, it is difficult to judge whether the reported agreement is statistically meaningful or merely consistent within large uncertainties.

    Authors: We agree that providing quantitative measures of agreement would enhance the clarity and rigor of the results section. In the revised manuscript, we will include χ² per degree of freedom calculations for each comparison, utilizing the full covariance matrix obtained from the unfolding procedure, which incorporates both statistical and systematic uncertainties. Where feasible, we will also present pull distributions to allow readers to assess the agreement in a more detailed manner. These additions will help quantify the level of consistency with the predictions. revision: yes

Circularity Check

0 steps flagged

No significant circularity; measurement extracted from data and tested against independent predictions

full rationale

The paper reports a direct measurement of differential cross sections from 138 fb^{-1} of LHC collision data in the dilepton channel. The unregularized least-squares unfolding corrects detector-level distributions to particle level using a response matrix derived from Monte Carlo, after which the unfolded results are compared to separate theoretical calculations and Monte Carlo generators. No equation or step reduces the reported cross sections to parameters defined by the result itself; the data-driven extraction remains independent of the comparison predictions. This is the standard, externally falsifiable procedure in high-energy physics and does not meet any of the enumerated circularity patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The measurement rests on standard domain assumptions of high-energy physics rather than new free parameters or postulated entities.

axioms (2)
  • domain assumption Monte Carlo simulations accurately model detector response, acceptance, and physics processes for unfolding and comparison.
    Unfolding and agreement claims depend on this modeling fidelity.
  • domain assumption Standard model calculations provide reliable predictions for the measured observables in the dilepton channel.
    The reported agreement is evaluated against these predictions.

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discussion (0)

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Reference graph

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