Recognition: 2 theorem links
· Lean TheoremPerformance of the CMS muon detector and muon reconstruction with proton-proton collisions at sqrt{s}= 13 TeV
Pith reviewed 2026-05-09 17:38 UTC · model grok-4.3
The pith
The upgraded CMS muon detector meets all design specifications for spatial resolution, efficiency, and timing in 13 TeV proton collisions.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
After the 2013-2014 modifications to the CMS muon detector, reconstruction algorithms, and trigger, proton-proton collision data at 13 TeV demonstrate that the system achieves its design spatial resolution, reconstruction efficiency, and timing performance. All measured parameters are reproduced by simulation, and the detector operates at least as well as in earlier runs despite the more demanding conditions of higher energy and luminosity.
What carries the argument
Direct measurement of muon spatial resolution, reconstruction efficiency, and timing using 13 TeV collision data, compared against simulation and prior performance benchmarks.
If this is right
- Muon identification remains reliable for physics analyses that rely on muons as final-state particles.
- Simulation can be used with confidence to forecast detector behavior in subsequent high-luminosity running periods.
- The upgrades successfully compensated for the increase in collision energy and instantaneous luminosity.
- Muon-based measurements will not be limited by detector performance in the near term.
Where Pith is reading between the lines
- This level of performance reduces one source of systematic uncertainty in searches for new particles that produce muons.
- Similar upgrade strategies at other LHC experiments could be expected to yield comparable stability.
- Continued monitoring during higher-luminosity runs will be needed, but the present results indicate no immediate barrier to further intensity increases.
- The agreement with simulation supports using the same modeling approach for future detector optimizations.
Load-bearing premise
The computer simulation must accurately model every relevant detector effect and the chosen data samples must contain no large biases from trigger, reconstruction, or selection choices.
What would settle it
A new data set in which the measured muon spatial resolution or efficiency deviates significantly from simulation predictions while remaining below design specifications would falsify the central claim.
read the original abstract
The CMS muon detector system, muon reconstruction software, and high-level trigger underwent significant changes in 2013-2014 in preparation for running at higher LHC collision energy and instantaneous luminosity. The performance of the modified system is studied using proton-proton collision data at center-of-mass energy $\sqrt{s}=$ 13 TeV, collected at the LHC in 2015 and 2016. The measured performance parameters, including spatial resolution, efficiency, and timing, are found to meet all design specifications and are well reproduced by simulation. Despite the more challenging running conditions, the modified muon system is found to perform as well as, and in many aspects better than, previously. We dedicate this paper to the memory of Prof. Alberto Benvenuti, whose work was fundamental for the CMS muon detector.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript reports the performance of the upgraded CMS muon detector, reconstruction algorithms, and high-level trigger using 13 TeV proton-proton collision data collected in 2015 and 2016. It concludes that measured spatial resolution, efficiency, and timing meet all design specifications, are well reproduced by simulation, and perform as well as or better than in Run 1 despite higher luminosity and pile-up.
Significance. If the results hold, the paper provides essential validation of the muon system for high-luminosity LHC operations and supplies benchmarks for muon-based physics analyses in CMS. Credit is due for the use of multiple orthogonal validation samples (Z→μμ, J/ψ, cosmic rays) and explicit pile-up modeling to address simulation fidelity and selection biases.
minor comments (3)
- [§3.2] §3.2: The tag-and-probe efficiency formula is described in text but would benefit from an explicit equation to clarify the background subtraction and statistical treatment.
- [Figure 8] Figure 8: The residual distributions for DT and CSC chambers would be clearer if the Gaussian fit parameters (mean and sigma) were tabulated alongside the plots rather than only stated in the caption.
- [§5] §5: The comparison to Run-1 performance references prior publications but omits a brief summary table of key metrics (e.g., efficiency at |η|<2.4) for direct side-by-side reading.
Simulated Author's Rebuttal
We thank the referee for the positive summary of our manuscript and the recommendation for minor revision. The assessment correctly notes the use of multiple validation samples and pile-up modeling. No specific major comments were provided in the report.
Circularity Check
No significant circularity
full rationale
The paper reports empirical measurements of muon detector performance (spatial resolution, efficiency, timing) extracted directly from 13 TeV collision data using standard techniques such as tag-and-probe and residual methods. These quantities are compared to pre-existing simulation and to Run-1 results; no derivation, prediction, or first-principles result is defined in terms of the measured outputs themselves. The analysis chain is data-driven and externally benchmarked against design specifications and independent validation samples (Z→μμ, J/ψ, cosmics), with no self-definitional loops, fitted inputs renamed as predictions, or load-bearing self-citations that reduce the central claims to tautology. The reported agreement with simulation is a post-hoc comparison, not a circular input.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption The simulation model accurately represents the detector response under the new running conditions
Forward citations
Cited by 22 Pith papers
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Search for single vector-like quark production in opposite-sign dilepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No excess observed in search for vector-like top quark T to tH in opposite-sign dilepton final states; 95% CL upper limits on sigma times BR range from 2.0 pb at 600 GeV to 0.1 pb at 1000 GeV.
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Observation of the rare decay $\eta$ $\to$ $\mu^+\mu^-$e$^+$e$^-$
CMS observes η → μ⁺μ⁻e⁺e⁻ for the first time and measures its branching fraction as (2.4 ± 0.8) × 10^{-6}.
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Observation of nuclear suppression in coherent $\Upsilon$(1S) photoproduction off heavy nuclei at the LHC
The measured cross-section ratio to a no-nuclear-effects baseline is 0.25, yielding a nuclear gluon suppression factor R_g^Pb of 0.55 at x ≈ 10^{-3} and μ² = 22.4 GeV².
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Simultaneous measurements of $N$-subjettiness observables in jets from gluons and light-flavour quarks, and in decays of boosted W bosons and top quarks
CMS reports a simultaneous measurement of 25 N-subjettiness observables in 1-, 2-, and 3-prong jets, unfolded to stable particles with particle-level correlations for QCD modeling.
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Evidence of ZZ$\gamma$ production and observation of $4\ell\gamma$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV
First evidence for ZZ gamma production at 3.7 sigma and observation of 4 lepton gamma at 5.0 sigma in CMS data at 13 TeV, with measured fiducial cross sections consistent with predictions.
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Measurement of the top quark pair production cross section in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.36 TeV
The ttbar production cross section in PbPb collisions at 5.36 TeV is measured as 3.42 +0.54-0.51 (stat) +0.50-0.43 (syst) μb and is consistent with NNLO pQCD predictions using nuclear PDFs.
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Search for electroweakinos in compressed-spectrum scenarios with low-momentum isolated tracks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No significant excess observed; 95% CL exclusion of higgsino electroweakinos with mass splittings 0.28-1.15 GeV and chargino masses up to 185 GeV using soft-track and neural-network selection.
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Search for associated production of a Higgs boson and two vector bosons via vector boson scattering at $\sqrt{s}$ = 13 TeV
CMS excludes κ_VV outside 0.40-1.60 at 95% CL and constrains κ_2W and κ_2Z using VBS events with a boosted Higgs to bb decay.
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Search for heavy resonances decaying into four-lepton final states via light bosons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No significant excess observed in four-lepton events from heavy resonances, setting upper limits on production cross sections for dilepton masses 0.4-15 GeV using novel merged-object techniques.
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Highly boosted dielectron identification in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS develops two multivariate models for identifying boosted dielectrons with γ_L > 20, reporting 80% efficiency for two-track cases from J/ψ data and 60% for single-track from Z conversions, plus an energy correction.
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Search for a new heavy resonance decaying to a top quark and a neutral scalar boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No excess found in search for T' to top plus phi; excludes T' masses 0.85-1.3 TeV at 95% CL for SM Higgs case with 5% width, and sets cross-section limits as low as 0.1 fb.
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Particle transformers for identifying Lorentz-boosted Higgs bosons decaying to a pair of W bosons
PaRT achieves >50% tagging efficiency for boosted H->WW jets at 1% background efficiency, decorrelated from jet mass, with data-to-simulation scale factors of 0.9-1.0 on 138 fb^{-1} of 13 TeV collisions.
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Search for soft unclustered energy patterns produced in association with a W or Z boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No significant excess is observed in leptonic W/Z plus high-multiplicity soft-particle events, setting limits on Higgs to SUEP decays across a range of model parameters.
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Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV and 13.6 TeV
No significant excess found; new exclusion limits reach m_H = 108 GeV for m_H - m_A = 78 GeV in the Inert Doublet Model.
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Search for a new heavy scalar resonance decaying into the Higgs boson and a new scalar particle in the $\mathrm{b}\bar{\mathrm{b}}\mathrm{b}\bar{\mathrm{b}}$ final state using proton-proton collisions at $\sqrt{s}$ = 13 TeV
No evidence found for a new heavy scalar resonance X decaying to Higgs plus new scalar Y in the four-bottom-quark final state; 95% CL upper limits set on cross section times branching fraction.
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Search for light charged Higgs bosons decaying to charm and strange quarks in $\mathrm{t\bar{t}}$ events in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No evidence found for light charged Higgs bosons in ttbar events; upper limits set on B(t to H±b) of 0.07-1.12% at 95% CL for masses 40-160 GeV assuming 100% decay to cs.
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A search for microscopic black holes, string balls, and sphalerons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No evidence found; excludes semiclassical black holes below 8.4-11.4 TeV and string balls below 9.0-10.7 TeV at 95% CL, and caps the quark-quark sphaleron fraction above 9 TeV at 0.0034.
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Improved results on Higgs boson pair production in the 4b final state
CMS sets an observed upper limit of 4.4 on the HH signal strength μ_HH in the 4b final state at 13.6 TeV, improving prior LHC results by more than a factor of two in the resolved topology.
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Measurement of the Z $\to$ $\mu^+\mu^-$ angular coefficients in pp collisions at $\sqrt{s}$ = 13 TeV as functions of transverse momentum and rapidity
New double-differential measurement of angular coefficients A0-A7 in Drell-Yan muon pair production in eight pT and two rapidity bins, compared to NNLO pQCD.
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Search for dark matter produced in association with a dark Higgs boson decaying into a bottom quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
New upper limits exclude mediator masses up to 4.5 TeV for a 50 GeV dark Higgs and up to 2.5 TeV for 150 GeV in a spin-1 mediator dark matter model, the most stringent to date for these masses.
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Search for the single production of vector-like quarks decaying into a W boson and a b quark using single-lepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No significant excess observed in search for vector-like quark single production to Wb, setting 95% CL upper limits on κ_W as low as 0.086 near 1.4 TeV mass and excluding masses below 2.4 TeV at κ_W=0.2.
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Search for new physics in triple boson production in proton-proton collisions at $\sqrt{s}$ = 13 TeV using the effective field theory approach
No excess in VVV production; bounds set on c_W/Λ² (-0.13 to 0.12 TeV^{-2}) and c_Hq3/Λ² (-0.24 to 0.21 TeV^{-2}) at 95% CL.
Reference graph
Works this paper leans on
-
[1]
The performance of the CMS muon detector in proton-proton collisions at√s = 7 TeV at the LHC
CMS Collaboration, “The performance of the CMS muon detector in proton-proton collisions at√s = 7 TeV at the LHC”, JINST 8 (2013) P11002, doi:10.1088/1748-0221/8/11/P11002, arXiv:1306.6905
-
[2]
Performance of CMS muon reconstruction in pp collision events at√s=7 TeV
CMS Collaboration, “Performance of CMS muon reconstruction in pp collision events at References 33 √s = 7 TeV”, JINST 7 (2012) P10002, doi:10.1088/1748-0221/7/10/P10002, arXiv:1206.4071
-
[3]
The CMS muon project: technical design report
CMS Collaboration, “The CMS muon project: technical design report”, CMS Technical Design Report CERN-LHCC-97-032, CERN, 1997
work page 1997
-
[4]
The CMS experiment at the CERN LHC
CMS Collaboration, “The CMS experiment at the CERN LHC”, JINST 3 (2008) S08004, doi:10.1088/1748-0221/3/08/S08004
-
[5]
CMS TriDAS project: technical design report, volume 1: The trigger systems
CMS Collaboration, “CMS TriDAS project: technical design report, volume 1: The trigger systems”, CMS Technical Design Report CERN-LHCC-2000-038, CMS-TDR-6-1, CERN, 2000
work page 2000
-
[6]
CMS Collaboration, “The CMS trigger system”, JINST 12 (2017) P01020, doi:10.1088/1748-0221/12/01/P01020, arXiv:1609.02366
-
[7]
Operation and configuration of the LHC in Run 1
R. Alemany-Fernandez et al., “Operation and configuration of the LHC in Run 1”, CERN Accelerator Note CERN-ACC-NOTE-2013-0041, CERN, 2013
work page 2013
-
[8]
Operation of the LHC with protons at high luminosity and high energy
G. Papotti et al., “Operation of the LHC with protons at high luminosity and high energy”, in Proc. of International Particle Accelerator Conference (IP AC 2016). Busan, Korea, May, 2016. doi:10.18429/JACoW-IPAC2016-WEOCA01
-
[9]
Approaching the nominal performance at the LHC
J. Wenninger, “Approaching the nominal performance at the LHC”, in Proc. of International Particle Accelerator Conference (IP AC 2017). Copenhagen, Denmark, May,
work page 2017
-
[10]
doi:10.18429/JACoW-IPAC2017-MOYAA1
-
[11]
CMS technical design report for the level-1 trigger upgrade
CMS Collaboration, “CMS technical design report for the level-1 trigger upgrade”, CMS Technical Design Report CERN-LHCC-2013-011, CMS-TDR-12, CERN, 2013
work page 2013
-
[12]
The CMS barrel muon trigger upgrade
A. Triossi et al., “The CMS barrel muon trigger upgrade”, JINST 12 (2017) C01095, doi:10.1088/1748-0221/12/01/C01095
-
[13]
Phase 1 upgrade of the CMS drift tubes read-out system
´A. Navarro-Tobar et al., “Phase 1 upgrade of the CMS drift tubes read-out system”, JINST 12 (2017) C03070, doi:10.1088/1748-0221/12/03/C03070
-
[14]
CMS Collaboration, “Validation of the mean-timer algorithm for DT local reconstruction and muon time measurement, using 2012 data”, CMS Detector Performance Summary CMS-DP-2015-026, CERN, 2015
work page 2012
-
[15]
Description and performance of track and primary-vertex reconstruction with the CMS tracker
S. Chatrchyan et al., “Description and performance of track and primary-vertex reconstruction with the CMS tracker”, JINST 9 (2014) P10009, doi:10.1088/1748-0221/9/10/P10009, arXiv:1405.6569
-
[16]
Performance of CMS muon reconstruction in cosmic-ray events
CMS Collaboration, “Performance of CMS muon reconstruction in cosmic-ray events”, JINST 5 (2010) T03022, doi:10.1088/1748-0221/5/03/T03022, arXiv:0911.4994
-
[17]
Application of Kalman filtering to track and vertex fitting
R. Fr ¨uhwirth, “Application of Kalman filtering to track and vertex fitting”, Nucl. Instrum. Meth. A 262 (1987) 444, doi:10.1016/0168-9002(87)90887-4
-
[18]
Particle-flow reconstruction and global event description with the CMS detector
CMS Collaboration, “Particle-flow reconstruction and global event description with the CMS detector”, JINST 12 (2017) P10003, doi:10.1088/1748-0221/12/10/P10003, arXiv:1706.04965. 34
work page internal anchor Pith review Pith/arXiv arXiv doi:10.1088/1748-0221/12/10/p10003 2017
-
[19]
Technical proposal for the Phase-II upgrade of the CMS detector
CMS Collaboration, “Technical proposal for the Phase-II upgrade of the CMS detector”, CMS Technical proposal CERN-LHCC-2015-010, CMS-TDR-15-02, CERN, 2015
work page 2015
-
[20]
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”, JHEP 07 (2014) 079, doi:10.1007/JHEP07(2014)079, arXiv:1405.0301
-
[21]
Single-top Wt-channel production matched with parton showers using the POWHEG method
E. Re, “Single-top Wt-channel production matched with parton showers using the POWHEG method”, Eur. Phys. J. C 71 (2011) 1547, doi:10.1140/epjc/s10052-011-1547-z , arXiv:1009.2450
-
[22]
T. Sj ¨ostrand, S. Mrenna, and P . Z. Skands, “PYTHIA 6.4 physics and manual”, JHEP 05 (2006) 026, doi:10.1088/1126-6708/2006/05/026, arXiv:hep-ph/0603175
-
[23]
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, arXiv:1410.3012
-
[24]
Event generator tunes obtained from underlying event and multiparton scattering measurements
CMS Collaboration, “Event generator tunes obtained from underlying event and multiparton scattering measurements”, Eur. Phys. J. C 76 (2016) 155, doi:10.1140/epjc/s10052-016-3988-x , arXiv:1512.00815
-
[25]
Ball, et al., JHEP04, 040 (2015)
NNPDF Collaboration, “Parton distributions for the LHC Run II”, JHEP 04 (2015) 040, doi:10.1007/JHEP04(2015)040, arXiv:1410.8849
-
[26]
G EANT 4 Collaboration, “G EANT 4—a simulation toolkit”, Nucl. Instrum. Meth. A 506 (2003) 250, doi:10.1016/S0168-9002(03)01368-8
-
[27]
A. C. Rencher and G. B. Schaalje, “Linear models in statistics”. John Wiley & Sons, Inc., New York, 2008
work page 2008
-
[28]
Alignment of the CMS tracker with LHC and cosmic ray data
CMS Collaboration, “Alignment of the CMS tracker with LHC and cosmic ray data”, JINST 9 (2014) P06009, doi:10.1088/1748-0221/9/06/P06009, arXiv:1403.2286
-
[29]
CMS physics technical design report, volume II: physics performance
CMS Collaboration, “CMS physics technical design report, volume II: physics performance”, J. Phys. G 34 (2007) 995, doi:10.1088/0954-3899/34/6/S01
-
[30]
Extracting muon momentum scale corrections for hadron collider experiments
A. Bodek et al., “Extracting muon momentum scale corrections for hadron collider experiments”, Eur. Phys. J. C 72 (2012) 2194, doi:10.1140/epjc/s10052-012-2194-8 , arXiv:1208.3710
-
[31]
W-like measurement of the Z boson mass using dimuon events collected in pp collisions at√s = 7 TeV
CMS Collaboration, “W-like measurement of the Z boson mass using dimuon events collected in pp collisions at√s = 7 TeV”, CMS Physics Analysis Summary CMS-PAS-SMP-14-007, CERN, 2016
work page 2016
-
[32]
Search for heavy long-lived charged particles in pp collisions at√s = 7 TeV
CMS Collaboration, “Search for heavy long-lived charged particles in pp collisions at√s = 7 TeV”, Phys. Lett. B 713 (2012) 408, doi:10.1016/j.physletb.2012.06.023, arXiv:1205.0272
-
[33]
M. Cacciari, G. P . Salam, and G. Soyez, “FAST JET user manual”, Eur. Phys. J. C 72 (2012) 1896, doi:10.1140/epjc/s10052-012-1896-2 , arXiv:1111.6097
-
[34]
Beam test results on double-gap resistive plate chambers proposed for CMS experiment
M. Abbrescia et al., “Beam test results on double-gap resistive plate chambers proposed for CMS experiment”, Nucl. Instrum. Meth. A 414 (1998) 135, doi:10.1016/S0168-9002(98)00571-3. References 35
-
[35]
Measurement of inclusive W and Z boson production cross sections in pp collisions at√s = 8 TeV
CMS Collaboration, “Measurement of inclusive W and Z boson production cross sections in pp collisions at√s = 8 TeV”, Phys. Rev. Lett. 112 (2014) 191802, doi:10.1103/PhysRevLett.112.191802, arXiv:1402.0923
-
[36]
Measurement of inclusive W and Z boson production cross sections in pp collisions at√s = 13 TeV
CMS Collaboration, “Measurement of inclusive W and Z boson production cross sections in pp collisions at√s = 13 TeV”, CMS Physics Analysis Summary CMS-PAS-SMP-15-004, CERN, 2015. 36 37 A The CMS Collaboration Yerevan Physics Institute, Yerevan, Armenia A.M. Sirunyan, A. Tumasyan Institut f ¨ ur Hochenergiephysik, Wien, Austria W. Adam, F. Ambrogi, E. Asil...
work page 2015
discussion (0)
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