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arxiv: 2511.17310 · v2 · submitted 2025-11-21 · ✦ hep-ex

Search for new physics in the final state with a single photon and large missing transverse momentum in proton-proton collisions at sqrt{s} = 13 TeV

CMS Collaboration This is my paper

Pith reviewed 2026-05-17 20:14 UTC · model grok-4.3

classification ✦ hep-ex
keywords dark matterlarge extra dimensionssingle photonmissing transverse momentumnew physics searchCMSLHC
0
0 comments X

The pith

No deviations from standard model expectations appear in single-photon plus missing transverse momentum events at 13 TeV.

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

The paper reports a search for new physics in proton-proton collisions that produce one photon and substantial missing transverse momentum. Data from 2017 and 2018 totaling 101 fb^{-1} are combined with 36 fb^{-1} from 2016, yielding 137 fb^{-1} overall. The observed event yields match standard model background predictions with no significant excess. These results are interpreted as 95% confidence level limits on simplified dark matter models and on large extra dimensions scenarios, improving the previous exclusion reach by up to 14% for mediator masses.

Core claim

The analysis of the complete 137 fb^{-1} dataset collected at 13 TeV shows that the number of events containing a single photon and large missing transverse momentum is consistent with standard model expectations. Limits at 95% confidence level are placed on the parameters of dark matter mediator models, effective field theory suppression scales, and the fundamental Planck scale in large extra dimension models, with the full dataset providing up to 14% stronger exclusions than the 2016 data alone.

What carries the argument

The single-photon plus missing transverse momentum final state interpreted through simplified dark matter production models and the ADD large extra dimensions framework.

If this is right

  • Stronger upper limits on dark matter mediator masses in simplified models.
  • Tighter bounds on the effective field theory suppression scale for contact interactions.
  • Improved constraints on the fundamental Planck scale in large extra dimensions models.

Where Pith is reading between the lines

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

  • The updated limits narrow the viable parameter space for dark matter candidates that couple to quarks via mediators.
  • Similar searches in other final states could be combined to test consistency across different production mechanisms.

Load-bearing premise

The standard model accurately describes all background processes in this final state and the simplified models used for interpretation correctly represent the new physics signatures.

What would settle it

A statistically significant excess of events in the single-photon plus missing transverse momentum signal region above the predicted standard model background would indicate new physics and contradict the no-deviation result.

Figures

Figures reproduced from arXiv: 2511.17310 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: Leading-order diagrams of graviton production in the ADD model (left), simplified [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Distribution of E γ T /p miss T for the 2017 (left) and 2018 (right) data sets. Templates for signal hypotheses are shown overlaid as light green and magenta dashed lines along with their cross section values. The cross hatched band represents the total systematic and statistical uncertainties. Events to the right of the red dashed vertical line are excluded. Events are also rejected if the minimum opening… view at source ↗
Figure 3
Figure 3. Figure 3: Distribution of ∆ϕ(⃗p miss T ,⃗p γ T ) for the 2017 (left) and 2018 (right) data sets. Templates for signal hypotheses are shown overlaid as light green and magenta dashed lines along with their cross section values. The cross hatched band represents the total systematic and statistical uncertainties. Events to the left of the red dashed vertical line are excluded [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of data and background post-fit distributions in the e [PITH_FULL_IMAGE:figures/full_fig_p014_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Comparison of data and background post-fit distributions in the ee [PITH_FULL_IMAGE:figures/full_fig_p015_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Comparison of data and background post-fit distributions for the vertical (left) and [PITH_FULL_IMAGE:figures/full_fig_p015_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: The ratio of 95% CL upper cross section limits to the theoretical cross section ( [PITH_FULL_IMAGE:figures/full_fig_p016_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: The 90% CL exclusion limits on the χ–nucleon spin-independent (left) and spin￾dependent (right) scattering cross sections involving vector and axial-vector operators, respec￾tively, are shown as a function of MDM, using the 2016–2018 data set. Simplified model DM parameters gq = 0.25 and gDM = 1 are assumed. Also shown are corresponding exclusion con￾tours, where regions above the curves are excluded, from… view at source ↗
Figure 9
Figure 9. Figure 9: The 95% CL observed and expected lower limits on [PITH_FULL_IMAGE:figures/full_fig_p018_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: The 95% CL upper limits on the ADD graviton production cross section as a function [PITH_FULL_IMAGE:figures/full_fig_p018_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Lower limit on the fundamental Planck scale [PITH_FULL_IMAGE:figures/full_fig_p019_11.png] view at source ↗
read the original abstract

A search for new physics in events featuring a single photon and missing transverse momentum is presented, using proton-proton $\sqrt{s}$ = 13 TeV collision data corresponding to an integrated luminosity of 101 fb$^{-1}$ collected by the CMS experiment at the CERN LHC between 2017 and 2018. This analysis, combined with a previous study of 36 fb$^{-1}$ of 2016 data (totaling 137 fb$^{-1}$), reveals no significant deviations from standard model expectations. The results are then used to establish 95% confidence level limits on parameters in theoretical models involving dark matter and large extra dimensions. Compared to the 2016-only analysis, this search achieves up to a 14% improvement in exclusion reach for mediator masses in simplified dark matter models, along with 11% and 10% enhancements in the limits on the effective field theory suppression scale and the fundamental Planck scale, respectively. These results are the most stringent constraints on these parameters to date.

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 / 2 minor

Summary. The manuscript presents a search for new physics in the single-photon plus large missing transverse momentum final state using 101 fb^{-1} of 13 TeV proton-proton collision data collected by CMS in 2017-2018. Combined with a prior analysis of 36 fb^{-1} from 2016 (total 137 fb^{-1}), no significant deviations from standard model expectations are observed. The results are interpreted to set 95% CL limits on simplified dark matter models (improving mediator mass exclusion reach by up to 14%) and large extra dimensions (improvements of 11% on the EFT suppression scale and 10% on the fundamental Planck scale), claiming these as the most stringent constraints to date.

Significance. If the background estimation, systematic uncertainties, and statistical methods are validated as described, the work provides meaningful incremental improvements to existing limits on dark matter and LED parameters using the full Run 2 dataset. The absence of deviations reinforces SM consistency in this channel, and the combined luminosity yields a modest but quantifiable gain in sensitivity. This is a standard, solid contribution to LHC BSM searches with clear falsifiable predictions via the reported limits.

major comments (1)
  1. [§5] §5 (Background Estimation and Validation): The extrapolation of background predictions from control regions (e.g., Z→ℓℓγ enriched or low-MET samples) to the high-MET signal region for the 2017-2018 dataset must explicitly demonstrate consistency with 2016 data regarding pile-up modeling and photon identification efficiencies; any unaccounted period-dependent differences would directly impact the no-deviation claim and the derived 95% CL limits on DM mediator masses.
minor comments (2)
  1. [Table 1] Table 1: The breakdown of systematic uncertainties should include a column for the combined 137 fb^{-1} dataset to allow direct assessment of the improvement over the 2016-only result.
  2. [Figure 4] Figure 4 (limit plots): Adding the 2016-only exclusion curves as dashed lines would facilitate immediate visual comparison of the 14% reach improvement claimed in the abstract.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment and recommendation for minor revision. We address the single major comment on background estimation and validation below, agreeing to enhance explicit comparisons as suggested while maintaining the robustness of our analysis.

read point-by-point responses

  1. Referee: [§5] §5 (Background Estimation and Validation): The extrapolation of background predictions from control regions (e.g., Z→ℓℓγ enriched or low-MET samples) to the high-MET signal region for the 2017-2018 dataset must explicitly demonstrate consistency with 2016 data regarding pile-up modeling and photon identification efficiencies; any unaccounted period-dependent differences would directly impact the no-deviation claim and the derived 95% CL limits on DM mediator masses.

    Authors: We thank the referee for highlighting this point. Our analysis already includes validations of the background extrapolation using control regions for the 2017-2018 dataset, with systematic uncertainties assigned to account for potential differences in pile-up modeling and photon identification efficiencies relative to 2016. These uncertainties are propagated to the final limits. To make the consistency more explicit, we will revise Section 5 in the updated manuscript to include a dedicated comparison of pile-up distributions and photon ID efficiency measurements across the 2016 and 2017-2018 periods, demonstrating agreement within uncertainties. This addition will not change the central results or limits but will strengthen the presentation. revision: yes

Circularity Check

0 steps flagged

No circularity: results from direct data-to-SM comparison and external model limits

full rationale

The paper's derivation consists of collecting 101 fb^{-1} of 2017-2018 data, estimating SM backgrounds via Monte Carlo normalized in control regions, comparing observed yields to predictions in the single-photon + MET signal region, finding no significant excess, and setting 95% CL limits on external simplified dark matter and large extra dimensions models. The combination with the prior 36 fb^{-1} 2016 dataset is a straightforward luminosity sum for improved sensitivity and does not reduce any central claim to a self-citation or fitted input by construction. All load-bearing steps rely on experimental data, standard simulation tools, and independently defined theoretical models rather than re-deriving inputs from outputs.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard domain assumptions about background modeling and model interpretations rather than new free parameters or invented entities.

axioms (2)
  • domain assumption Standard Model processes accurately model the expected background in single photon plus missing transverse momentum events.
    Invoked when stating no significant deviations from SM expectations.
  • domain assumption The simplified theoretical models for dark matter and large extra dimensions are appropriate for setting exclusion limits at 95% CL.
    Used to interpret the null result as constraints on model parameters.

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Reference graph

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