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Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
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abstract
The performance is presented of the reconstruction and identification algorithms for electrons and photons with the CMS experiment at the LHC. The reported results are based on proton-proton collision data collected at a center-of-mass energy of 13 TeV and recorded in 2016-2018, corresponding to an integrated luminosity of 136 fb$^{-1}$. Results obtained from lead-lead collision data collected at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV are also presented. Innovative techniques are used to reconstruct the electron and photon signals in the detector and to optimize the energy resolution. Events with electrons and photons in the final state are used to measure the energy resolution and energy scale uncertainty in the recorded events. The measured energy resolution for electrons produced in Z boson decays in proton-proton collision data ranges from 2 to 5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material. The energy scale in the same range of energies is measured with an uncertainty smaller than 0.1 (0.3)% in the barrel (endcap) region in proton-proton collisions and better than 1 (3)% in the barrel (endcap) region in heavy ion collisions. The timing resolution for electrons from Z boson decays with the full 2016-2018 proton-proton collision data set is measured to be 200 ps.
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Cited by 44 Pith papers
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Search for resonant production of lepton-enriched semivisible jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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Off-shell Higgs boson measurements: Yukawa couplings, self-coupling, compositeness, and width
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Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass
Unfolded double-differential W+jets cross section versus jet p_T and soft-drop mass yields m_W = 80.83 ± 0.55 GeV, the most precise all-jets extraction at a hadron collider.
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System-size dependence of charged-particle suppression in ultrarelativistic nucleus-nucleus collisions
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Evidence for similar collectivity of high transverse momentum particles in pPb and PbPb collisions
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Combination of vector boson scattering measurements in leptonic final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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Search for a top-philic Z' boson decaying into a $\mathrm{t\bar{t}}$ pair in a final state with jets and an electron or muon in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
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Search for soft unclustered energy patterns in proton-proton collisions at $\sqrt{s}$ = 13 TeV using data scouting
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Search for nonresonant triple Higgs boson production in the final state with six bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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Search for Higgs boson production at high transverse momentum in the WW decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A first dedicated search for highly Lorentz-boosted H->WW decays at the LHC finds mu = -0.19 +0.48/-0.46, consistent with no signal above background.
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Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Using 138 fb^-1 of CMS data, the first tt-gamma-g channel search finds no excess and excludes spin-1/2 (spin-3/2) excited top quarks below 930 (1330) GeV.
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Lepton and photon energy scale and resolution corrections based on the minimization of an analytical likelihood: IJazZ2.0
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Measurement and effective field theory interpretation of the photon-fusion production cross section of a pair of W bosons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS observes photon-fusion W+W- production at 13 TeV with >5 sigma significance and measures sigma = 643 +82/-78 fb, consistent with the standard-model prediction of 631 +/- 126 fb.
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Search for long-lived particles using displaced vertices with low-momentum tracks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A displaced-vertex search for compressed-spectrum long-lived particles excludes top squarks up to about 1100 GeV and wino-like neutralinos up to about 550 GeV, the strongest limits on these benchmark models.
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Search for dark matter production in association with bottom quarks and a lepton pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
First dedicated CMS search for bb + dilepton + missing transverse momentum in the 2HDM+a model finds no signal and sets 95% CL cross-section limits of 10^-2 to 10^-3 pb for mH = 400-2000 GeV.
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Wasserstein normalized autoencoder for anomaly detection
A Wasserstein-distance-trained normalized autoencoder detects semivisible jets in simulated LHC events with AUCs around 0.69–0.77, outperforming standard and normalized autoencoders on a ttbar background.
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Search for a Higgs boson produced in association with a charm quark and decaying to a W boson pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
The first search for a Higgs boson produced with a charm quark and decaying to a W-boson pair sees no excess, and combined with the diphoton channel limits the Higgs-charm coupling to below 47 times the standard model...
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Exploring small-angle emissions in charm quark jets in proton-proton collisions at $\sqrt{s}$ = 5.02 TeV
CMS reports the first late-kT groomed splitting-angle distributions for prompt D0 jets at pT 100-120 GeV and finds suppression consistent with the charm dead cone, while soft-drop suppression appears driven by gluon s...
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Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $\gamma\gamma\tau\tau$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS finds no evidence for Higgs-pair or new-scalar production in the two-photon plus two-tau final state and sets new upper limits on these processes.
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Proposed measurement of longitudinally polarised vector bosons in $WH$ and $ZH$ production at Hadron colliders
Simulation-based projections show longitudinally polarised W bosons in WH production could be measured at 5-sigma significance with 300 fb^-1 at the LHC.
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Measurement of WWZ and ZH production cross sections at $\sqrt{s}$ = 13 and 13.6 TeV
The WWZ and ZH production rates match the standard model, with a combined significance of 4.5 standard deviations and first evidence at 13.6 TeV.
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Search for a neutral gauge boson with nonuniversal fermion couplings in vector boson fusion processes in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS finds no evidence for a VBF-produced Z' boson with nonuniversal fermion couplings and excludes masses up to 2.45 TeV (tau-tau) and 1.60 TeV (WW), assuming 50% branching fractions and maximal W coupling.
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Measurement of the W boson decay branching fraction ratio $\mathcal{B}$(W $\to$ cq) / $\mathcal{B}$(W $\to$ $\mathrm{q\bar{q}'}$) in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Using 138 inverse femtobarns of 13 TeV proton-proton collisions, CMS measured the W to charm branching fraction ratio as 0.489 ± 0.020, consistent with the Standard Model.
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Search for heavy neutral Higgs bosons A and H in the $\mathrm{t\bar{t}}$Z channel in proton-proton collisions at 13 TeV
A CMS search in a previously unexplored final state finds no heavy neutral Higgs signal and sets the most stringent limits to date on the A to ZH to tt process at high masses.
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Constraints on standard model effective field theory for a Higgs boson produced in association with W or Z bosons in the H $\to\mathrm{b\bar{b}}$ decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS reports simultaneous constraints on six dimension-six SMEFT Wilson coefficients from VH, H to bb production at sqrt(s) = 13 TeV; all results agree with the standard model.
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Search for rare decays of the Z and Higgs bosons to a J/$\psi$ or $\psi$(2S) meson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS sets 95% confidence upper limits on Z and Higgs decays to J/psi or psi(2S) plus a photon and constrains the ratio of Higgs-charm to Higgs-photon couplings.
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Measurement of the $\gamma\gamma \to \tau \tau$ cross section and constraints on the anomalous magnetic moment of the $\tau$ lepton in ultraperipheral PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
CMS measures gamma-gamma -> tau+tau- in PbPb UPCs and constrains the tau anomalous magnetic moment to -0.039 < a_tau < 0.032 (95% CL), with a fiducial cross-section of 555+60-14 microbarns.
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Search for the pair production of long-lived supersymmetric partners of the tau lepton in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No long-lived staus are observed; CMS excludes stau masses up to 425 GeV at 50 mm lifetime (mass-degenerate) and decay lengths 21-94 mm / 6-333 mm at 200 GeV.
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Search for dark matter produced in association with a Higgs boson decaying to bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A CMS search with 138 fb^-1 of 13 TeV data finds no dark matter produced with a Higgs boson decaying to bottom quarks, and sets 95% CL exclusions on Z' and 2HDM+a model parameters.
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Search for a boosted Higgs boson decaying to bottom quark pairs in association with a W or Z boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
In 138 fb^-1 of 13 TeV proton collisions, CMS measures the boosted VH, H->bb signal strength as mu=0.72^{+0.75}_{-0.71}, consistent with the Standard Model.
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Determination of the strong coupling and its running from measurements of inclusive jet production
A NNLO QCD fit to CMS inclusive jet cross sections at 2.76, 7, 8 and 13 TeV plus HERA DIS yields alphaS(mZ) = 0.1176 (+0.0014, -0.0016) and confirms the predicted running of the strong coupling up to 1.6 TeV.
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Measurement of the inclusive WZ production cross section in pp collisions at $\sqrt{s}$ = 13.6 TeV
The CMS experiment measured the inclusive WZ production cross section at 13.6 TeV and found it consistent with Standard Model predictions.
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A measurement of the Higgs boson mass in the diphoton decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS measures the Higgs mass in H→γγ with 138 fb⁻¹ at 13 TeV as 125.13 ± 0.15 GeV, and 125.06 ± 0.14 GeV when combined with 7+8 TeV diphoton data.
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Towards the Swampland of Flavour Symmetries
A thesis claiming flavour theories with explicitly broken (or absent) symmetries can be as predictive and TeV-testable as symmetry-protected ones, demonstrated via type-II seesaw textures, minimal SO(10) with leptoqua...
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Measurement of the $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) differential cross sections in pp collisions at $\sqrt{s}$ = 13.6 TeV
First CMS measurement of Υ(1S), Υ(2S), and Υ(3S) differential cross sections at √s=13.6 TeV, extending the pT reach from 100 to 200 GeV.
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Search for a new neutral gauge boson produced in association with one or two b jets and decaying into a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No Z' boson decaying to muon pairs and produced with b jets appears in 138 fb⁻¹ of CMS data, yielding first 95% CL limits of 0.2–2 fb on σ×B×A×ε across 125–350 GeV.
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Measurements of Higgs boson production cross section in the four-lepton final state in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
At sqrt(s)=13.6 TeV, the H->ZZ->4l fiducial production cross section is measured to be 2.89 +0.53/-0.49 (stat) +0.29/-0.21 (syst) fb, agreeing with the SM prediction 3.09 +0.27/-0.24 fb.
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Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
In PbPb ultraperipheral collisions at 5.02 TeV, CMS measured the Breit-Wheeler and light-by-light fiducial cross sections in agreement with QED and set the most stringent axion-like particle limits in the 5-10 GeV mass range.
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Search for heavy neutral resonances decaying to tau lepton pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Using 138 fb^-1 of 13 TeV proton-proton collisions, CMS finds no tau-pair resonance and sets its strongest limit yet on Z' bosons.
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Electron efficiency in LHC Run-2 with the ATLAS experiment
An ATLAS conference proceedings reviews electron efficiencies from LHC Run-2, reporting reconstruction efficiency above 97% and data-to-MC correction factors near unity.
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