CMS has released 37 new results for the ICHEP 2024. These results cover the full spectrum of the CMS physics program, including a few relevant highlights.
On Higgs boson and Standard Model Measurements
In HIG-23-013, we present the most precise determination of Higgs boson production rate as a function of quantities like Higgs boson momentum, emission direction, and number of associated jets. The jump in precision is obtained by combining various Higgs decay channels (γγ, ZZ, WW, ττ). This study is a sort of microscope that could zoom in on new physics effects, normally too small to be seen, but relatively larger in size when we focus on Higgs bosons produced at high energy.
We use a highly pure sample of top quarks as a laboratory to study the fundamental properties of the standard model, which might not hold at large collision energy. In TOP-22-011 we look for signs of lepton flavour violation in top production and decay; lepton flavour conservation is a rigid property of the standard model that has been rigorously observed in past experiments, meaning any violation would be indicative of physics beyond the standard model. In SMP-24-009, we isolate a pure sample of W bosons from top-quark decays to deliver the most precise measurement to date of the W boson decay rate to quarks. We benefit from the large cross-section of top quark-antiquark production, which offers a sizable, high-purity sample of W bosons suitable for this measurement.
Several new results exploit data collected during the ongoing Run 3, highlighting the increasing focus of CMS on this new data sample. These include the measurements of inclusive and differential Higgs boson production cross sections at 13.6 TeV in the H → γγ decay channel (HIG-23-014) and in the H → ZZ → 4l decay channel (HIG-24-013), as well as the measurement of the inclusive WZ production cross section using the LHC Run3 (SMP-24-005).
On Flavour Physics (Beauty and Charm)
We report a study of the ratio of the Bc+ → J/ψτ+ντ and Bc+ → J/ψμ+νμ branching fractions using three-prong τ lepton decays to test lepton flavour universality (BPH-23-001). This study follows similar work by other experiments, which highlighted hints of deviation from the standard model prediction. Our result, obtained by combining this new measurement with our previous BPH-22-012, is compatible with the standard model expectation.
Exploiting an innovative high-rate dimuon trigger deployed for Run 3, we present the most sensitive search for the rare decay D0 → μ+μ− (BPH-23-008). Rare charm quark decays, less explored than rare bottom quark decays, offer a unique way to probe for new physics effects beyond the reach of modern colliders.
On Searches
We present the search for heavy scalar resonances decaying to a pair of Z bosons in the 4-lepton final state (HIG-24-002). This search is performed in a model-independent way over a mass range of the heavy scalar from 130 GeV to 3 TeV, considering a wide range of width scenarios. Given its strong sensitivity and the lack of signs of new particles, our study excludes previous claims of a possible second Higgs boson in the mass range 650-680 GeV.
We perform a statistical combination of several searches for Supersymmetry using the whole LHC Run 2 data. The combination is interpreted in terms of a 19-parameter scan of the phenomenological Minimal Supersymmetric Standard Model (SUS-24-004). This study provides a global picture of how current CMS searches challenge the so-called “natural SUSY” explanation of the open issues with the Standard Model (lack of an explanation for dark matter, instability of the Higgs boson mass, etc.) pushing the allowed mass range for squarks and gluinos above the TeV scale. This study still leaves behind a few unexplored challenging corners where SUSY particle masses are compressed in a small range. We then challenge these corners with a general search, using a dedicated reconstruction technique called Recursive Jigsaw (SUS-23-003), one of the most advanced techniques for SUSY particle reconstruction at the LHC. This analysis extends our sensitivity to the pair production of electroweakinos, sleptons, and top squarks in these compressed-mass scenarios.
On Heavy Ions
In heavy ion collisions, we study quark-gluon plasma (QGP) looking at how it modifies the properties of quark and gluon jets travelling through it. In HIN-23-004 we study the imprint of the QGP on the jet, using the same technique adopted in cosmology to study the dark matter imprint on the cosmic microwave background. In HIN-21-019 we look at jets recoiling against a photon (which is transparent to QGP, as it does not feel the strong force) to study how the QGP deviates the jet trajectory with respect to the photon one (they are supposed to be back to back). Both studies provide new tools to improve our understanding of QGP dynamics
On Artificial Intelligence
At ICHEP, CMS presents the first data collected by an AI agent acting as a trigger. An autoencoder is trained on data to learn the typical look of LHC collision. Looking at these data, this neural network learns to quantify the probability that a given collision is typical. This network is then translated into an electronic circuit deployed on a special kind of chip (an FPGA). At work in the CMS L1 trigger, the AI agent sees all the events and decides to store only events that have a probability of less than 1 in 10000 to happen. The translation is performed using hls4ml, a software tool developed by CERN and its partners for this purpose (but also being used in studies related to automotive, ocean monitoring from satellites, etc.).
See our full results presented at ICHEP, including detector performance reviews. Details of the papers and briefings will added throughout the conference:
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Group
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Title of the study
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Read the full PAS / Paper
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Find the briefing here:
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HIG-22-004
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Search for a heavy CP-odd Higgs boson decaying into a 125 GeV Higgs boson and a Z boson in final states with two tau and two light leptons at √s = 13 TeV
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CMS-PAS-HIG-22-004 |
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HIG-23-010
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Search for Higgs boson production in association with a charm quark in the diphoton decay channel
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CMS-PAS-HIG-23-010 |
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HIG-23-012
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Search for highly energetic double Higgs boson production in the two bottom quark and two vector boson all-hadronic final state
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CMS-PAS-HIG-23-012
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Read the Briefing |
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HIG-23-013
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Combination and interpretation of fiducial differential Higgs boson production cross sections at √s = 13 TeV
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CMS-PAS-HIG-23-013 |
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HIG-23-014
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Measurements of inclusive and differential Higgs boson production cross sections at 13.6 TeV in the H → γγ decay channel
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CMS-PAS-HIG-23-014
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Read the Briefing
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HIG-24-001
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Constraining HHWW anomalous couplings via production of like-charge WWH through vector boson scattering
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CMS-PAS-HIG-24-001 |
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HIG-24-002
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Search for heavy scalar resonances decaying to a pair of Z bosons in the 4-lepton final state at √s = 13 TeV
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CMS-PAS-HIG-24-002 |
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HIG-24-013
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Measurements of Higgs boson production cross section in the four-lepton final state at √s = 13.6 TeV
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CMS-PAS-HIG-24-013 |
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SMP-22-018
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Measurement of WZγ production and search for new physics using WZγ events in proton-proton collisions at √s = 13 TeV
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CMS-PAS-SMP-22-018 |
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SMP-23-005
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Observation of γγ → ττ in proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton
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arXiv:2406.03975 |
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SMP-24-005
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Measurement of the inclusive WZ production cross section in pp collisions at √s =13.6 TeV with the CMS experiment
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CMS-PAS-SMP-24-005 |
Read the Briefing |
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SMP-24-009
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Measurement of the W → cq/W → qq ̄ ′ decay branching fraction ratio in proton-proton collisions at √s = 13 TeV
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CMS-PAS-SMP-24-009
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SMP-23-006
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Proton reconstruction using the TOTEM Roman pot detectors during the high-β∗ data taking period
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CMS-PAS-SMP-23-006
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TOP-22-011
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Search for lepton flavour violation in the top quark interactions with an up-type quark, a muon, and a τh lepton
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CMS-PAS-TOP-22-011 |
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TOP-24-001
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Measurement of the dineutrino system kinematics in dileptonic top quark pair events in pp collisions at √s = 13 TeV
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CMS-PAS-TOP-24-001 |
Read the Briefing |
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BPH-22-007
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Measurement of double-differential and total charm cross sections at 7 TeV
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CMS-PAS-BPH-22-007 |
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BPH-22-009
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Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s = 13 TeV
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arXiv:2406.14409 |
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BPH-23-001
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Measurement of the ratio of the Bc+ → J/ψτ+ντ and Bc+ → J/ψμ+νμ branching fractions using three-prong τ lepton decays in proton-proton collisions at √s = 13 TeV
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BPH-23-001 |
Read the Briefing |
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BPH-23-008
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Search for Rare Charm Decays Into Two Muons
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CMS-PAS-BPH-23-008 |
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HIN-21-019
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First measurement of jet axis decorrelation with photon-tagged jets in pp and PbPb collisions at 5.02 TeV
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CMS-PAS-HIN-21-019
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HIN-23-004
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Energy-energy correlators from PbPb and pp collisions at 5.02 TeV
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CMS-PAS-HIN-23-004 |
Read the Briefing |
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LUM-20-002
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Luminosity measurement for nucleus-nucleus collisions at √ s NN = 5.02 TeV in Run 2
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CMS-PAS-LUM-20-002 |
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B2G-22-005
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Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state at √s = 13 TeV
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CMS-PAS-B2G-22-005 |
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EXO-22-006
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Search for lepton flavour universality violation via production of a new neutral gauge boson decaying to two muons with one or two b-jets in pp collisions at √s = 13 TeV
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CMS-PAS-EXO-22-006
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EXO-23-010
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Search for nonresonant new physics in high-mass dilepton events in association with b-tagged jets
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CMS-PAS-EXO-23-010 |
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EXO-23-015
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Search for Vector-like Leptons with Long-lived Particle Decays in the Muon System
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CMS-PAS-EXO-23-015 |
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EXO-24-007
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Search for low mass vector and scalar resonances decaying into quark-antiquark pairs
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CMS-PAS-EXO-24-007 |
Read the Briefing |
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EXO-22-013
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Search for t-channel scalar and vector leptoquark exchange in the high mass dilepton spectrum in proton-proton collisions at √s = 13 TeV
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CMS-PAS-EXO-22-013 |
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SUS-23-002
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Search for supersymmetric particle pair production in final states with two oppositely charged leptons and large missing transverse momentum in proton-proton collisions at √s = 13 TeV
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CMS-PAS-SUS-23-002 |
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SUS-23-003
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General search for supersymmetric particles in scenarios with compressed mass spectra using proton-proton collisions at √s = 13 TeV
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CMS-PAS–SUS-23-003 |
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SUS-23-004
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Search for new physics with a monotop signature
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CMS-PAS-SUS-23-004 |
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SUS-23-012
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Search for dark matter produced in association with a Higgs boson decaying to τ+τ− at √s = 13 TeV
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CMS-PAS-SUS-23-012 |
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SUS-23-018
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Search for DM in association with b-quarks and lepton pairs
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CMS-PAS-SUS-23-018 |
Read the briefing |
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SUS-24-001
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Search for bosons of an extended Higgs sector in b quark final states in proton-proton collisions at √s = 13 TeV
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CMS-PAS-SUS-24-001 |
Read the Briefing |
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SUS-24-004
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Phenomenological MSSM interpretation of CMS searches in pp collisions at √s = 13 TeV
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CMS-PAS-SUS-24-004 |
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MLG-23-005
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Development of systematic-aware neural network trainings for binned-likelihood-analyses at the LHC
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CMS-PAS-MLG-23-005 |
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MLG-24-001
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Reweighting of simulated events using machine learning techniques in CMS
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CMS-PAS-MLG-24-001 |
Read the Briefing |
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Detector Performance Reviews
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BTV
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b-hive: a modular training framework for state-of-the-art object-tagging within the Python ecosystem at the CMS experiment
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DP-2024-020
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BTV
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Run 3 commissioning results of heavy-flavor jet tagging at √s=13.6 TeV
with CMS data using a modern framework for data processing
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DP-2024-024
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BTV
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A unified approach for jet tagging in Run 3 at √s=13.6 TeV in CMS
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DP-2024-066
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BTV
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Performance of boosted bb jet tagging at √s = 13.6 TeV with Run 3 CMS data
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DP-2024-055
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BTV
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Performance summary of AK4 jet b tagging with data from 2022 proton-proton collisions at 13.6 TeV with the CMS detector
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DP-2024-025
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EGM
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Electron and photon reconstruction and identification performance in 2022 and 2023
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DP-2024-052
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EGM/HLT
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Electron trigger performance in 2023
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DP-2024-041
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| EXO/HLT |
Low transverse-momentum hadronic tau lepton reconstruction performance in the Run 3 Scouting dataset |
CMS-NOTE-2024-006
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JME
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Determination of jet identification criteria with proton-proton collision at 13.6 TeV data collected with the CMS detector at the CERN LHC
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DP-2024-028
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JME
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Jet Energy Scale and Resolution Measurements Using Run3 Data Collected by CMS in 2022 and 2023
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DP-2024-039
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JME
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Hadronic top quark tagging with variable-sized jets for the CMS experiment
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DP-2024-038
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JME
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Optimizing the pileup per particle identification algorithm in the context of tau lepton identification in Run 3
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DP-2024-043
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JME
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Distinguishing between W+, W- , and Z jets using a ParticleNet based jet charge tagger
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DP-2024-044
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JME
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Jet energy scale and resolution of jets with ParticleNet pT regression using Run3 data collected by the CMS experiment in 2023 at 13.6 TeV
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DP-2024-064
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L1T
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Analysis of muons and calorimeter objects collected by the Level-1 Trigger Data Scouting demonstrator during LHC Run 3
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DP-2024-056
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L1T
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Level-1 Trigger Algorithm for Long-lived Particle Jets in Run 3
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DP-2024-058
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L1T
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Standalone barrel e/gamma and calorimeter based jet and tau reconstruction in the Level-1 Phase-2 Calorimeter Trigger
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DP-2024-057
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L1T
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Displaced Vertex Track Trigger for the CMS Phase-2 Level-1 Trigger Upgrade
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DP-2024-032
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L1T/HLT
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Data Collected with AXOL1TL Anomaly Detection at the CMS Level-1 Trigger
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DP-2024-059
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LUM
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Preliminary luminosity measurement in the 2023 proton-proton collisions at a center-of-mass energy of 13.6 TeV in CMS
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DP-2024-068
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MUO
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Results on the standard muon momentum calibration with 2022 and 2023 data
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DP-2024-065
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MUO
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Muon performance in 2024 data
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DP-2024-067
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PF/HLT
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Heterogeneous Reconstruction of Hadronic Particle Flow Clusters with Alpaka Portability Library
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DP-2024-026
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PRO
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PPS Performance: first evaluation of the two-arm vertex resolution with timing detectors in 2023
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DP-2024-009
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PRO
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PPS: performance in Run 3 and efficiency of the pixel detector
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DP-2024-008
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TAU
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Performance of the DNN-based tau identification algorithm (DeepTau v2.5) with Domain Adaptation using Adversarial Machine Learning for Run 2
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DP-2024-063
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TAU
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Tau lepton identification in displaced topologies using machine learning at CMS
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DP-2024-053
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TAU/HLT
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Performance of Tau Lepton Reconstruction at the High Level Trigger using 2023 Data from the CMS Experiment at CERN
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DP-2024-042
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TRK
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Tracking performance using Tag and Probe with Z->µµ
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DP-2024-054
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