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arxiv: 2511.19563 · v2 · submitted 2025-11-24 · ✦ hep-ex

Recognition: 1 theorem link

· Lean Theorem

Search for light pseudoscalar bosons, pair-produced in Higgs boson decays in the four-electron final state in proton-proton collisions at sqrt{s} = 13 TeV

CMS Collaboration
Authors on Pith no claims yet

Pith reviewed 2026-05-17 04:50 UTC · model grok-4.3

classification ✦ hep-ex
keywords Higgs boson decayspseudoscalar bosonsfour-electron final stateCMS experimentLHCaxion-like particlesbranching fraction limitsmultivariate analysis
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The pith

No significant excess is observed in the search for light pseudoscalar pairs from Higgs decays to four electrons.

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

The paper performs a search for light neutral pseudoscalar bosons produced in pairs from Higgs boson decays, each decaying into a collimated electron-positron pair. It uses 138 fb inverse of proton-proton collision data at 13 TeV collected by the CMS detector and introduces a multivariate algorithm based on tracks and calorimeter deposits to select events containing two such merged pairs. No excess above standard model background predictions is found. This leads to the first LHC upper limits at 95 percent confidence level on the branching fraction of the Higgs to four electrons via this mode, reaching sensitivities as low as 10 to the minus five for pseudoscalar masses from 10 to 100 MeV and decay lengths below 100 micrometers. A sympathetic reader cares because these limits constrain possible new light particles that might address open questions like the strong CP problem.

Core claim

The analysis finds no significant excess above the standard model background predictions. Upper limits on the branching fraction for H to AA to 4e are set at 95 percent confidence level for A masses between 10 and 100 MeV and proper decay lengths below 100 micrometers, reaching branching fraction sensitivities as low as 10 to the minus five. This constitutes the first search for Higgs boson decays to four electrons via light pseudoscalars at the LHC and improves experimental sensitivity to axionlike particles with masses below 100 MeV.

What carries the argument

A novel multivariate algorithm that combines tracks and calorimeter information to identify highly collimated electron-positron pairs from light pseudoscalar decays.

If this is right

  • The branching fraction for Higgs decays to pairs of light pseudoscalars decaying to electrons is constrained below values as low as 10 to the minus five in the specified mass and lifetime range.
  • These are the first LHC constraints on this specific decay channel for axionlike particles.
  • The search covers masses from 10 to 100 MeV with proper decay lengths below 100 micrometers at 95 percent confidence level.

Where Pith is reading between the lines

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

  • The improved sensitivity to light axionlike particles may help narrow the parameter space for models addressing the strong CP problem.
  • The identification technique for collimated lepton pairs could be adapted to other searches involving light resonances decaying to electrons or muons.
  • Additional data from future LHC runs could extend the limits to smaller branching fractions or slightly higher masses.

Load-bearing premise

The novel multivariate algorithm correctly identifies highly collimated electron-positron pairs with well-understood efficiency and low misidentification rate from ordinary backgrounds, as modeled in simulation.

What would settle it

A statistically significant excess of events with two collimated electron-positron pairs above the predicted background in the selected sample would indicate a signal and falsify the no-excess result.

Figures

Figures reproduced from arXiv: 2511.19563 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: Invariant mass distribution of the four-electron system ( [PITH_FULL_IMAGE:figures/full_fig_p007_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Observed (solid points) and expected (dashed lines) 95% CL upper limits on the Higgs [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: A map of the observed 95% CL upper limit on the Higgs boson branching fraction for [PITH_FULL_IMAGE:figures/full_fig_p014_3.png] view at source ↗
read the original abstract

A search for pairs of light neutral pseudoscalar bosons (A) resulting from the decay of a Higgs boson is performed. The search is conducted using LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV, collected with the CMS detector in 2016$-$2018 and corresponding to an integrated luminosity of 138 fb$^{-1}$. The A boson decays into a highly collimated electron-positron pair. A novel multivariate algorithm using tracks and calorimeter information is developed to identify these distinctive signatures, and events are selected with two such merged electron-positron pairs. No significant excess above the standard model background predictions is observed. Upper limits on the branching fraction for H $\to$ AA $\to$ 4e are set at 95% confidence level, for masses between 10 and 100 MeV and proper decay lengths below 100 $\mu$m, reaching branching fraction sensitivities as low as 10$^{-5}$. This is the first search for Higgs boson decays to four electrons via light pseudoscalars at the LHC. It significantly improves the experimental sensitivity to axionlike particles with masses below 100 MeV.

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 paper reports a search for light neutral pseudoscalar bosons A produced in pairs via Higgs boson decays, with each A decaying to a highly collimated electron-positron pair, using 138 fb^{-1} of CMS proton-proton collision data at 13 TeV. A novel multivariate algorithm based on tracks and calorimeter clusters is developed to select events with two such merged e+e- pairs. No significant excess above standard model background predictions is observed, and 95% CL upper limits are set on the branching fraction BR(H → AA → 4e) for A masses between 10 and 100 MeV and proper decay lengths below 100 μm, reaching sensitivities as low as 10^{-5}. This is presented as the first LHC search for this signature.

Significance. If the central result holds after validation, the work provides the first LHC constraints on axion-like particles in the 10-100 MeV mass range through Higgs decays, improving experimental sensitivity by roughly an order of magnitude relative to prior indirect bounds. The development of a dedicated multivariate discriminator for highly collimated lepton pairs represents a technical contribution that could be useful for other searches involving merged objects.

major comments (2)
  1. [Methods / multivariate algorithm description] The headline limits rest on the novel multivariate algorithm for identifying merged e+e- pairs (described in the methods section following event selection). Signal efficiency and background yields are taken from Monte Carlo after training on simulated tracks and calorimeter clusters, but no data-driven validation, control-region studies, or data-MC agreement plots are shown for efficiency or fake rates at the relevant opening angles (∼10-100 MeV mass scale). This is load-bearing for the background modeling and limit extraction.
  2. [Background modeling and limit-setting procedure] Background estimation and systematic uncertainties (likely in the results or limit-setting section) are summarized at a high level in the abstract but lack explicit discussion of how the multivariate discriminator response is validated against data for ordinary SM processes that could produce fake merged pairs (e.g., conversions, Dalitz decays, or pileup). Without this, the claim of 'no significant excess' and the quoted sensitivity cannot be fully assessed.
minor comments (2)
  1. [Abstract] The abstract states the integrated luminosity as 138 fb^{-1} but does not specify the exact data-taking periods or trigger strategy used for the four-electron signature; this should be clarified for reproducibility.
  2. [Introduction or results] Notation for the proper decay length (cτ) and mass range is clear, but the paper should explicitly state whether the limits assume a specific production mode for the Higgs (e.g., gluon fusion) or include all relevant modes.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful review and constructive comments on our manuscript. We address each major comment below and indicate the revisions we intend to implement to strengthen the presentation of the multivariate algorithm and background validation.

read point-by-point responses

  1. Referee: [Methods / multivariate algorithm description] The headline limits rest on the novel multivariate algorithm for identifying merged e+e- pairs (described in the methods section following event selection). Signal efficiency and background yields are taken from Monte Carlo after training on simulated tracks and calorimeter clusters, but no data-driven validation, control-region studies, or data-MC agreement plots are shown for efficiency or fake rates at the relevant opening angles (∼10-100 MeV mass scale). This is load-bearing for the background modeling and limit extraction.

    Authors: We agree that explicit validation of the multivariate algorithm performance is essential. In the revised manuscript we will expand the methods section with a description of the training and validation strategy on simulated samples. We will also add data-MC comparison plots for the input track and calorimeter variables as well as the discriminator output itself, using a control region enriched in photon conversions and Dalitz decays. These additions will provide a direct check on fake rates at the opening angles relevant to the 10-100 MeV mass range and will improve the transparency of the background modeling. revision: yes

  2. Referee: [Background modeling and limit-setting procedure] Background estimation and systematic uncertainties (likely in the results or limit-setting section) are summarized at a high level in the abstract but lack explicit discussion of how the multivariate discriminator response is validated against data for ordinary SM processes that could produce fake merged pairs (e.g., conversions, Dalitz decays, or pileup). Without this, the claim of 'no significant excess' and the quoted sensitivity cannot be fully assessed.

    Authors: We acknowledge that the current text provides only a summary-level description of background estimation. We will revise the background modeling and results sections to include explicit studies of the multivariate discriminator response in data control regions targeting SM processes that can produce fake merged pairs, such as conversions, Dalitz decays, and pileup contributions. Systematic uncertainties associated with the discriminator and background yields will be discussed in greater detail. These changes will allow readers to more fully evaluate the no-excess observation and the quoted sensitivity. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental upper limits derived from data vs. simulation comparison

full rationale

The paper is a standard LHC experimental search that selects events with two merged e+e- pairs using a multivariate algorithm, compares observed yields to Monte Carlo background predictions, and sets 95% CL upper limits on BR(H→AA→4e) when no excess is seen. No derivation chain reduces a claimed result to its own fitted inputs or self-citations by construction; the limits follow directly from the observed event counts in the signal region after standard background subtraction. The multivariate discriminator performance is taken from simulation, but this is an external modeling assumption rather than a self-referential loop where the output defines the input. The analysis remains self-contained against external benchmarks (data luminosity, detector simulation, and statistical limit-setting procedures).

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

Ledger is provisional because only the abstract is available; experimental searches rest on simulation fidelity and background modeling rather than free parameters or new axioms.

axioms (1)
  • domain assumption Standard Model background predictions accurately describe the data in the selected four-electron region
    Used to interpret the absence of excess as a limit on new physics.
invented entities (1)
  • Light neutral pseudoscalar boson A no independent evidence
    purpose: Hypothetical particle produced in H to AA decays and decaying to collimated e+e- pairs
    Postulated in the search; no independent evidence or discovery claim is made.

pith-pipeline@v0.9.0 · 5517 in / 1301 out tokens · 51660 ms · 2026-05-17T04:50:22.458151+00:00 · methodology

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Reference graph

Works this paper leans on

60 extracted references · 60 canonical work pages · 6 internal anchors

  1. [1]

    Problem of StrongPandTInvariance in the Presence of Instantons

    F. Wilczek, “Problem of StrongPandTInvariance in the Presence of Instantons”,Phys. Rev. Lett.40(1978) 279,doi:10.1103/PhysRevLett.40.279

    work page doi:10.1103/physrevlett.40.279 1978

  2. [2]

    CP Conservation in the Presence of Instantons

    R. D. Peccei and H. R. Quinn, “CP Conservation in the Presence of Instantons”,Phys. Rev. Lett.38(1977) 1440,doi:10.1103/PhysRevLett.38.1440

    work page doi:10.1103/physrevlett.38.1440 1977

  3. [3]

    The tensor force between two protons at long range

    N. F. Ramsey, “The tensor force between two protons at long range”,Physica A96(1979) 285,doi:10.1016/0378-4371(79)90217-6

    work page doi:10.1016/0378-4371(79)90217-6 1979

  4. [4]

    A New Light Boson?

    S. Weinberg, “A New Light Boson?”,Phys. Rev. Lett.40(1978) 223, doi:10.1103/PhysRevLett.40.223

    work page doi:10.1103/physrevlett.40.223 1978

  5. [5]

    New Macroscopic Forces?

    J. E. Moody and F. Wilczek, “New Macroscopic Forces?”,Phys. Rev. D30(1984) 130, doi:10.1103/PhysRevD.30.130

    work page doi:10.1103/physrevd.30.130 1984

  6. [6]

    Axions and the strong CP problem

    J. E. Kim and G. Carosi, “Axions and the strong CP problem”,Rev. Mod. Phys.82(2010) 557,doi:10.1103/RevModPhys.82.557. [Erratum: doi:10.1103/RevModPhys.91.049902]

    work page doi:10.1103/revmodphys.82.557 2010

  7. [7]

    Cosmology of Spontaneously Broken Gauge Family Symmetry

    Z. G. Berezhiani and M. Y. Khlopov, “Cosmology of Spontaneously Broken Gauge Family Symmetry”,Z. Phys. C49(1991) 73,doi:10.1007/BF01570798

    work page doi:10.1007/bf01570798 1991

  8. [8]

    Challenges for a QCD Axion at the 10 MeV Scale

    J. Liu, N. McGinnis, C. E. M. Wagner, and X.-P . Wang, “Challenges for a QCD Axion at the 10 MeV Scale”,J. High Energy Phys.2021(2021), no. 05, 138, doi:10.1007/JHEP05(2021)138. 8

    work page doi:10.1007/jhep05(2021)138 2021

  9. [9]

    How viable is a QCD axion near 10 MeV?

    S. Girmohanta, S. Nakagawa, Y. Nakai, and J. Xu, “How viable is a QCD axion near 10 MeV?”,J. High Energy Phys.2024(2024), no. 10, 153, doi:10.1007/JHEP10(2024)153

    work page doi:10.1007/jhep10(2024)153 2024

  10. [10]

    Search for axion-like dark matter with spin-based amplifiers

    M. Jiang et al., “Search for axion-like dark matter with spin-based amplifiers”,Nature Phys.17(2021) 1402,doi:10.1038/s41567-021-01392-z

    work page doi:10.1038/s41567-021-01392-z 2021

  11. [11]

    Recent Progress in the Physics of Axions and Axion-Like Particles

    K. Choi, S. H. Im, and C. Sub Shin, “Recent Progress in the Physics of Axions and Axion-Like Particles”,Ann. Rev. Nucl. Part. Sci.71(2021) 225, doi:10.1146/annurev-nucl-120720-031147

    work page doi:10.1146/annurev-nucl-120720-031147 2021

  12. [12]

    Observation of Anomalous Internal Pair Creation in 8Be: A Possible Indication of a Light, Neutral Boson

    A. J. Krasznahorkay et al., “Observation of Anomalous Internal Pair Creation in 8Be: A Possible Indication of a Light, Neutral Boson”,Phys. Rev. Lett.116(2016) 042501, doi:10.1103/PhysRevLett.116.042501

    work page doi:10.1103/physrevlett.116.042501 2016

  13. [13]

    Search for the X17 particle in 7Li(p, e+e−)8Be processes with the MEG II detector

    MEG II Collaboration, “Search for the X17 particle in 7Li(p, e+e−)8Be processes with the MEG II detector”,Eur. Phys. J. C85(2025) 763, doi:10.1140/epjc/s10052-025-14345-0

    work page doi:10.1140/epjc/s10052-025-14345-0 2025

  14. [14]

    Search for a new 17 MeV resonance viae +e− annihilation with the PADME Experiment

    PADME Collaboration, “Search for a new 17 MeV resonance viae +e− annihilation with the PADME Experiment”, 2025.arXiv:2505.24797

    work page arXiv 2025

  15. [15]

    LHC as an Axion Factory: Probing an Axion Explanation for(g−2) µ with Exotic Higgs Decays

    M. Bauer, M. Neubert, and A. Thamm, “LHC as an Axion Factory: Probing an Axion Explanation for(g−2) µ with Exotic Higgs Decays”,Phys. Rev. Lett.119(2017) 031802, doi:10.1103/PhysRevLett.119.031802

    work page doi:10.1103/physrevlett.119.031802 2017

  16. [16]

    ALP explanation to the muon (g-2) and its test at future Tera-Z and Higgs factories

    J. Liu, X. Ma, L.-T. Wang, and X.-P . Wang, “ALP explanation to the muon (g-2) and its test at future Tera-Z and Higgs factories”,Phys. Rev. D107(2023) 095016, doi:10.1103/PhysRevD.107.095016

    work page doi:10.1103/physrevd.107.095016 2023

  17. [17]

    Search for exotic Higgs boson decaysH→ AA →4γwith events containing two merged diphotons in proton-proton collisions at √s= 13 TeV

    CMS Collaboration, “Search for exotic Higgs boson decaysH→ AA →4γwith events containing two merged diphotons in proton-proton collisions at √s= 13 TeV”,Phys. Rev. Lett.131(2023) 101801,doi:10.1103/PhysRevLett.131.101801

    work page doi:10.1103/physrevlett.131.101801 2023

  18. [18]

    The CMS experiment at the CERN LHC

    CMS Collaboration, “The CMS experiment at the CERN LHC”,J. Instrum.3(2008) S08004,doi:10.1088/1748-0221/3/08/S08004

    work page doi:10.1088/1748-0221/3/08/s08004 2008

  19. [19]

    Development of the CMS detector for the CERN LHC Run 3

    CMS Collaboration, “Development of the CMS detector for the CERN LHC Run 3”,J. Instrum.19(2024) P05064,doi:10.1088/1748-0221/19/05/P05064

    work page doi:10.1088/1748-0221/19/05/p05064 2024

  20. [20]

    HEPData record for this analysis

    “HEPData record for this analysis”, 2025.doi:10.17182/hepdata.159276

    work page doi:10.17182/hepdata.159276 2025

  21. [21]

    Performance of the CMS Level-1 trigger in proton-proton collisions at √s=13 TeV

    CMS Collaboration, “Performance of the CMS Level-1 trigger in proton-proton collisions at √s=13 TeV”,J. Instrum.15(2020) P10017, doi:10.1088/1748-0221/15/10/P10017

    work page doi:10.1088/1748-0221/15/10/p10017 2020

  22. [22]

    The CMS trigger system

    CMS Collaboration, “The CMS trigger system”,J. Instrum.12(2017) P01020, doi:10.1088/1748-0221/12/01/P01020

    work page doi:10.1088/1748-0221/12/01/p01020 2017

  23. [23]

    Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC

    CMS Collaboration, “Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC”,J. Instrum.16(2021) P05014, doi:10.1088/1748-0221/16/05/P05014

    work page doi:10.1088/1748-0221/16/05/p05014 2021

  24. [24]

    Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at √s=13 TeV

    CMS Collaboration, “Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at √s=13 TeV”,J. Instrum.13(2018) P06015, doi:10.1088/1748-0221/13/06/P06015. References 9

    work page internal anchor Pith review doi:10.1088/1748-0221/13/06/p06015 2018

  25. [25]

    Description and performance of track and primary-vertex reconstruction with the CMS tracker

    CMS Collaboration, “Description and performance of track and primary-vertex reconstruction with the CMS tracker”,J. Instrum.9(2014) P10009, doi:10.1088/1748-0221/9/10/P10009

    work page doi:10.1088/1748-0221/9/10/p10009 2014

  26. [26]

    Particle-flow reconstruction and global event description with the CMS detector

    CMS Collaboration, “Particle-flow reconstruction and global event description with the CMS detector”,J. Instrum.12(2017) P10003, doi:10.1088/1748-0221/12/10/P10003

    work page internal anchor Pith review doi:10.1088/1748-0221/12/10/p10003 2017

  27. [27]

    Performance of reconstruction and identification ofτleptons decaying to hadrons andν τ in pp collisions at √s=13 TeV

    CMS Collaboration, “Performance of reconstruction and identification ofτleptons decaying to hadrons andν τ in pp collisions at √s=13 TeV”,J. Instrum.13(2018) P10005,doi:10.1088/1748-0221/13/10/P10005

    work page doi:10.1088/1748-0221/13/10/p10005 2018

  28. [28]

    Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV

    CMS Collaboration, “Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV”,J. Instrum.12(2017) P02014, doi:10.1088/1748-0221/12/02/P02014

    work page doi:10.1088/1748-0221/12/02/p02014 2017

  29. [29]

    Performance of missing transverse momentum reconstruction in proton-proton collisions at √s=13 TeV using the CMS detector

    CMS Collaboration, “Performance of missing transverse momentum reconstruction in proton-proton collisions at √s=13 TeV using the CMS detector”,J. Instrum.14(2019) P07004,doi:10.1088/1748-0221/14/07/P07004

    work page doi:10.1088/1748-0221/14/07/p07004 2019

  30. [30]

    Higgs production via gluon fusion in the POWHEG approach in the SM and in the MSSM

    E. Bagnaschi, G. Degrassi, P . Slavich, and A. Vicini, “Higgs production via gluon fusion in the POWHEG approach in the SM and in the MSSM”,J. High Energy Phys.2012 (2012), no. 02, 088,doi:10.1007/JHEP02(2012)088

    work page doi:10.1007/jhep02(2012)088 2012

  31. [31]

    A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms

    P . Nason, “A new method for combining NLO QCD with shower Monte Carlo algorithms”,J. High Energy Phys.2004(2004), no. 11, 040, doi:10.1088/1126-6708/2004/11/040

    work page internal anchor Pith review doi:10.1088/1126-6708/2004/11/040 2004

  32. [32]

    Matching NLO QCD computations with Parton Shower simulations: the POWHEG method

    S. Frixione, P . Nason, and C. Oleari, “Matching NLO QCD computations with parton shower simulations: the POWHEG method”,J. High Energy Phys.2007(2007), no. 11, 070,doi:10.1088/1126-6708/2007/11/070

    work page internal anchor Pith review doi:10.1088/1126-6708/2007/11/070 2007

  33. [33]

    A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX

    S. Alioli, P . Nason, C. Oleari, and E. Re, “A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX”,J. High Energy Phys. 2010(2010), no. 06, 043,doi:10.1007/JHEP06(2010)043

    work page internal anchor Pith review doi:10.1007/jhep06(2010)043 2010

  34. [34]

    An introduction to PYTHIA 8.2

    T. Sj ¨ostrand et al., “An introduction to PYTHIA 8.2”,Comput. Phys. Commun.191(2015) 159,doi:10.1016/j.cpc.2015.01.024

    work page doi:10.1016/j.cpc.2015.01.024 2015

  35. [35]

    Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements

    CMS Collaboration, “Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements”,Eur. Phys. J. C80(2020) 4, doi:10.1140/epjc/s10052-019-7499-4

    work page doi:10.1140/epjc/s10052-019-7499-4 2020

  36. [36]

    Parton distributions from high-precision collider data

    NNPDF Collaboration, “Parton distributions from high-precision collider data”,Eur. Phys. J. C77(2017) 663,doi:10.1140/epjc/s10052-017-5199-5

    work page internal anchor Pith review doi:10.1140/epjc/s10052-017-5199-5 2017

  37. [37]

    Merging meets matching in MC@NLO

    R. Frederix and S. Frixione, “Merging meets matching in MC@NLO”,J. High Energy Phys.2012(2012), no. 12, 061,doi:10.1007/JHEP12(2012)061

    work page doi:10.1007/jhep12(2012)061 2012

  38. [38]

    The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

    J. Alwall et al., “The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations”,J. High Energy Phys.2014(2014), no. 07, 079,doi:10.1007/JHEP07(2014)079. 10

    work page doi:10.1007/jhep07(2014)079 2014

  39. [39]

    MiNNLOPS: a new method to match NNLO QCD to parton showers

    P . F. Monni et al., “MiNNLOPS: a new method to match NNLO QCD to parton showers”, J. High Energy Phys.2020(2020), no. 05, 143,doi:10.1007/JHEP05(2020)143. [Erratum:doi:10.1007/JHEP02(2022)031]

    work page doi:10.1007/jhep05(2020)143 2020

  40. [40]

    MiNNLOPS: optimizing 2→1 hadronic processes

    P . F. Monni, E. Re, and M. Wiesemann, “MiNNLOPS: optimizing 2→1 hadronic processes”,Eur. Phys. J. C80(2020) 1075, doi:10.1140/epjc/s10052-020-08658-5

    work page doi:10.1140/epjc/s10052-020-08658-5 2020

  41. [41]

    Event generation with Sherpa 2.2

    E. Bothmann et al., “Event generation with Sherpa 2.2”,SciPost Phys7(2019) 034, doi:10.21468/SciPostPhys.7.3.034

    work page doi:10.21468/scipostphys.7.3.034 2019

  42. [42]

    Parton distributions for the LHC Run II

    NNPDF Collaboration, “Parton distributions for the LHC Run II”,J. High Energy Phys. 2015(2015), no. 04, 040,doi:10.1007/JHEP04(2015)040

    work page doi:10.1007/jhep04(2015)040 2015

  43. [43]

    Single and Double Electron Trigger Efficiencies using the full Run 2 dataset

    CMS Collaboration, “Single and Double Electron Trigger Efficiencies using the full Run 2 dataset”, CMS Detector Performance Summaries CMS-DP-2020-016, 2020

    work page 2020

  44. [44]

    Reconstruction of decays to merged photons using end-to-end deep learning with domain continuation in the CMS detector

    CMS Collaboration, “Reconstruction of decays to merged photons using end-to-end deep learning with domain continuation in the CMS detector”,Phys. Rev. D108(2023) 052002, doi:10.1103/PhysRevD.108.052002

    work page doi:10.1103/physrevd.108.052002 2023

  45. [45]

    Reconstruction of Electrons with the Gaussian-Sum Filter in the CMS Tracker at the LHC

    W. Adam, R. Fr ¨uhwirth, A. Strandlie, and T. Todor, “Reconstruction of Electrons with the Gaussian-Sum Filter in the CMS Tracker at the LHC”. CMS-NOTE-2005-001, 2005. https://cds.cern.ch/record/815410

    work page 2005

  46. [46]

    Adaptive vertex fitting

    R. Fruhwirth, W. Waltenberger, and P . Vanlaer, “Adaptive vertex fitting”,J. Phys. G34 (2007) N343,doi:10.1088/0954-3899/34/12/N01

    work page doi:10.1088/0954-3899/34/12/n01 2007

  47. [47]

    XGBoost: A scalable tree boosting system

    T. Chen and C. Guestrin, “XGBoost: A scalable tree boosting system”, inProc. 22nd ACM SIGKDD Int. Conf. on Knowledge Discovery and Data Mining, KDD ’16, p. 785. Association for Computing Machinery, New York, NY, USA, 2016. doi:10.1145/2939672.2939785

    work page doi:10.1145/2939672.2939785 2016

  48. [48]

    Technical proposal for the Phase-II upgrade of the Compact Muon Solenoid

    CMS Collaboration, “Technical proposal for the Phase-II upgrade of the Compact Muon Solenoid”, CMS Technical Proposal CERN-LHCC-2015-010, CMS-TDR-15-02, 2015

    work page 2015

  49. [49]

    On the interpretation ofχ 2 from contingency tables, and the calculation of p

    R. A. Fisher, “On the interpretation ofχ 2 from contingency tables, and the calculation of p”,J. R. Stat. Soc.85(1922) 87,doi:10.1111/j.2397-2335.1922.tb00768.x

    work page doi:10.1111/j.2397-2335.1922.tb00768.x 1922

  50. [50]

    Measurements of t ¯tH Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel

    CMS Collaboration, “Measurements of t ¯tH Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel”,Phys. Rev. Lett.125(2020) 061801, doi:10.1103/PhysRevLett.125.061801

    work page doi:10.1103/physrevlett.125.061801 2020

  51. [51]

    Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at√s=13TeV

    CMS Collaboration, “Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at√s=13TeV”,Phys. Lett. B860(2025) 139067, doi:10.1016/j.physletb.2024.139067

    work page doi:10.1016/j.physletb.2024.139067 2025

  52. [52]

    Handling uncertainties in background shapes: the discrete profiling method

    P . D. Dauncey, M. Kenzie, N. Wardle, and G. J. Davies, “Handling uncertainties in background shapes: the discrete profiling method”,J. Instrum.10(2015), no. 04, P04015, doi:10.1088/1748-0221/10/04/P04015

    work page doi:10.1088/1748-0221/10/04/p04015 2015

  53. [53]

    A Study of the Reactionsψ ′ →γγψ

    M. J. Oreglia, “A Study of the Reactionsψ ′ →γγψ”. PhD thesis, Stanford University, Stanford, USA, dec, 1980. Ph.D. thesis.doi:10.2172/6491918. 11

    work page doi:10.2172/6491918 1980

  54. [54]

    Charmonium Spectroscopy from Radiative Decays of theJ/ψandψ ′

    J. E. Gaiser, “Charmonium Spectroscopy from Radiative Decays of theJ/ψandψ ′”. PhD thesis, Stanford University, Stanford, USA, aug, 1982. Ph.D. thesis. doi:10.2172/1453988

    work page doi:10.2172/1453988 1982

  55. [55]

    Precision luminosity measurement in proton-proton collisions at√s=13 TeV in 2015 and 2016 at CMS

    CMS Collaboration, “Precision luminosity measurement in proton-proton collisions at√s=13 TeV in 2015 and 2016 at CMS”,Eur. Phys. J. C81(2021) 800, doi:10.1140/epjc/s10052-021-09538-2

    work page doi:10.1140/epjc/s10052-021-09538-2 2015

  56. [56]

    CMS luminosity measurement for the 2017 data-taking period at√s=13 TeV

    CMS Collaboration, “CMS luminosity measurement for the 2017 data-taking period at√s=13 TeV”, CMS Physics Analysis Summary CMS-PAS-LUM-17-004, 2018

    work page 2017

  57. [57]

    CMS luminosity measurement for the 2018 data-taking period at√s=13 TeV

    CMS Collaboration, “CMS luminosity measurement for the 2018 data-taking period at√s=13 TeV”, CMS Physics Analysis Summary CMS-PAS-LUM-18-002, 2019

    work page 2018

  58. [58]

    Handbook of LHC Higgs cross sections: 4. Deciphering the nature of the Higgs sector

    LHC Higgs Cross Section Working Group, “Handbook of LHC Higgs cross sections: 4. Deciphering the nature of the Higgs sector”, CERN Report CERN-2017-002-M, 2016. doi:10.23731/CYRM-2017-002

    work page doi:10.23731/cyrm-2017-002 2017

  59. [59]

    The CMS statistical analysis and combination tool: COMBINE

    CMS Collaboration, “The CMS statistical analysis and combination tool: COMBINE”, Comput. Softw. Big Sci.8(2024) 19,doi:10.1007/s41781-024-00121-4

    work page doi:10.1007/s41781-024-00121-4 2024

  60. [60]

    Manifesting the invisible axion at low-energies

    H. Georgi, D. B. Kaplan, and L. Randall, “Manifesting the invisible axion at low-energies”,Phys. Lett. B169(1986) 73,doi:10.1016/0370-2693(86)90688-X. A Interpretation of results in the effective ALP-Higgs coupling model To bridge the gap between the collider and intensity-frontier experiments, the reported limits are interpreted in an effective ALP coupl...

    work page doi:10.1016/0370-2693(86)90688-x 1986