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CMS Physics Analysis Summaries

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2026-05-16
10:19
Search for low-mass resonances decaying to a pair of muons in proton-proton collisions at sqrt(s) = 13.6 TeV /CMS Collaboration
A search for prompt production of low-mass dimuon resonances is reported using proton-proton collision events at $\sqrt{s} = 13.6~\mathrm{TeV}$ collected by the CMS detector in 2022-2024, corresponding to an integrated luminosity of 175$~\mathrm{fb}^{-1}$. The search employs a newly developed inclusive dimuon trigger and probes the existence of GeV-scale dark photons. [...]
CMS-PAS-EXO-25-019.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003: PDF; Figure_004: PDF; Figure_005: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-15
22:30
Search for heavy top quark partners with charge 5/3 in the single-lepton final state in proton-proton collisions at sqrt{s}=13~TeV /CMS Collaboration
A search for the pair production of a vector-like quark ($X_{5/3}$), a heavy fermionic partner of the top quark with an exotic electric charge of 5/3 times the charge of the positron, is presented. The search is performed in the single-lepton final state, where the lepton is either an electron or a muon, using proton-proton collision data collected by the CMS experiment at the LHC from 2016 to 2018 at a center-of-mass energy of $\sqrt{s}=13~\mathrm{TeV}$, corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-B2G-24-005.- Geneva : CERN, 2026 Figure_001-a: PDF; Figure_001-b: PDF; Figure_001-c: PDF; Figure_001-d: PDF; Figure_002: PDF; Figure_003: PDF; Figure_004: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_006: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-14
23:08
Performance of heavy-flavour jet identification in the CMS high-level trigger during LHC Run 3 /CMS Collaboration
The CMS trigger system plays a crucial role during data taking, reducing the large collision rate delivered by the Large Hadron Collider (LHC) to a few kHz for data storage and subsequent offline analysis. The system aims to maintain high selection efficiency for processes involving jets from heavy-flavour quarks (b and c), which constitute a distinctive signature in many physics analyses. [...]
CMS-PAS-BTV-25-002.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_002-c: PDF; Figure_002-d: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_003-c: PDF; Figure_003-d: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_008-a: PDF; Figure_008-b: PDF; Figure_008-c: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_009-c: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_010-c: PDF; Figure_011-a: PDF; Figure_011-b: PDF; Figure_011-c: PDF; Figure_012-a: PDF; Figure_012-b: PDF; Figure_012-c: PDF; Figure_013-a: PDF; Figure_013-b: PDF; Figure_013-c: PDF; Figure_014-a: PDF; Figure_014-b: PDF; Figure_014-c: PDF; Figure_015: PDF; Figure_016-a: PDF; Figure_016-b: PDF; Figure_017-a: PDF; Figure_017-b: PDF; Figure_018-a: PDF; Figure_018-b: PDF; Figure_019-a: PDF; Figure_019-b: PDF; Figure_020-a: PDF; Figure_020-b: PDF; Figure_021: PDF; Figure_022-a: PDF; Figure_022-b: PDF; Figure_023-a: PDF; Figure_023-b: PDF; Figure_024-a: PDF; Figure_024-b: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-14
10:11
A machine-learning method for the estimation of the background from jets misidentified as hadronic tau lepton decays /CMS Collaboration
Backgrounds arising from quark- and gluon-initiated jets misidentified as hadronically decaying tau leptons constitute a major experimental challenge for analyses involving tau leptons. The MUFFIN (MUltivariate Fake-Factor INference) approach, a machine-learning-based method for estimating this background directly from data, is presented. [...]
CMS-PAS-TAU-25-001.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002: PDF; Figure_003: PDF; Figure_004: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_005-c: PDF; Figure_005-d: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_007-c: PDF; Figure_007-d: PDF; Figure_008-a: PDF; Figure_008-b: PDF; Figure_008-c: PDF; Figure_008-d: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_009-c: PDF; Figure_009-d: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_010-c: PDF; Figure_010-d: PDF; Figure_011-a: PDF; Figure_011-b: PDF; Figure_012-a: PDF; Figure_012-b: PDF; Figure_012-c: PDF; Figure_012-d: PDF; Figure_012-e: PDF; Figure_012-f: PDF; Figure_013-a: PDF; Figure_013-b: PDF; Figure_013-c: PDF; Figure_013-d: PDF; Figure_013-e: PDF; Figure_013-f: PDF; Figure_014-a: PDF; Figure_014-b: PDF; Figure_015-a: PDF; Figure_015-b: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-04-17
15:25
Evidence for sequential Upsilon suppression in light ion collisions /CMS Collaboration
Measurements of the three lowest $S$-wave bottomonium resonances, $\Upsilon(1\mathrm{S})$, $\Upsilon(2\mathrm{S})$, and $\Upsilon(3\mathrm{S})$, are presented using data from oxygen-oxygen and neon-neon collisions recorded in 2025 by the CMS detector at the CERN LHC. The data correspond to a nucleon-nucleon center-of-mass energy of $\sqrt{s_{\mathrm{NN}}}=5.36~\mathrm{TeV}$ and integrated luminosities of $8.4~\mathrm{nb}^{-1}$ (oxygen-oxygen) and $0.8~\mathrm{nb}^{-1}$ (neon-neon), with a proton-proton reference sample of $456~\mathrm{pb}^{-1}$ collected at the same energy. [...]
CMS-PAS-HIN-25-015.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_004: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-04-07
21:49
Search for the rare Higgs boson decay H to Z gamma in proton-proton collisions at sqrt(s)=13 and 13.6 TeV /CMS Collaboration
A search is presented for the rare Higgs boson decay $\mathrm{H}\to\mathrm{Z}\gamma$, where $\mathrm{Z}\to \ell^{+}\ell^{-}$ and $\ell^{\pm} = \mathrm{e}^{\pm}$ or $\mu^{\pm}$. The search is performed using a sample of proton-proton (pp) collision data at the center-of-mass energies of 13 and 13.6 TeV, recorded by the CMS experiment at the LHC and corresponding to a total integrated luminosity of 200 $\mathrm{fb}^{-1}$. [...]
CMS-PAS-HIG-25-010.- Geneva : CERN, 2026 Figure_001-a: PDF; Figure_001-b: PDF; Figure_001-c: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_004-c: PDF; Figure_004-d: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_005-c: PDF; Figure_005-d: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_006-c: PDF; Figure_006-d: PDF; Figure_006-e: PDF; Figure_007: PDF; Figure_008: PDF; Figure_009: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-04-03
15:41
Measurements of inclusive and differential cross sections for Higgs boson production with decay to four leptons in proton-proton collisions at 13.6 TeV /CMS Collaboration
Measurements of Higgs boson ($\mathrm{H}$) production cross sections in the four-lepton ($4\ell, \ell=\mathrm{e},\mu$) final state at a center-of-mass energy $\sqrt{s}=13.6\,\mathrm{TeV}$ are presented. These measurements are based on data collected with the CMS detector at the CERN LHC between 2022 and 2024, corresponding to an integrated luminosity of $171\,\mathrm{fb}^{-1}$. [...]
CMS-PAS-HIG-25-015.- Geneva : CERN, 2026 Figure_001: PNG; Figure_002: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_003-c: PDF; Figure_003-d: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_005-a: PNG; Figure_005-b: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_007-c: PDF; Figure_008-a: PDF; Figure_008-b: PDF; Figure_008-c: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_009-c: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_011-a: PDF; Figure_011-b: PDF; Figure_012-a: PDF; Figure_012-b: PDF; Figure_012-c: PDF; Figure_013-a: PDF; Figure_013-b: PDF; Figure_014-a: PDF; Figure_014-b: PDF; Figure_015-a: PDF; Figure_015-b: PDF; Figure_015-c: PDF; Figure_016: PDF; Figure_017: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-03-31
13:50
Measurement of the 3 Top Quark Production /CMS Collaboration
A search for the standard model production of three top quarks is presented. The data analyzed were collected with the CMS detector at the CERN LHC in proton-proton collisions at a center-of-mass energy of $13~\mathrm{TeV}$ and correspond to an integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-TOP-24-006.- Geneva : CERN, 2026 Figure_001: PNG; Figure_002: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_003-c: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_005: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_006-c: PDF; Figure_006-d: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_007-c: PDF; Figure_007-d: PDF; Figure_008: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-03-30
16:28
Evidence of the dead-cone effect in bottom quark initiated jets /CMS Collaboration
The suppression of collinear gluon emissions from a massive quark, or the ``dead-cone effect,'' is the primary manifestation of quark mass effects in parton showers. A differential measurement is presented of the emission density of bottom quarks, studied as a function of the angular separation between the emissions from the same emitter. [...]
CMS-PAS-SMP-25-008.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_A001: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-03-25
11:39
Search for s-channel production of tau-enriched semivisible jets in proton-proton collisions at 13 TeV /CMS Collaboration
A search for resonant production of $\tau$-enriched semivisible jets from a strongly coupled dark sector in proton-proton collisions at the LHC is presented. The search is performed using data collected by the CMS experiment from 2016 to 2018 at a center-of-mass energy of 13 TeV, corresponding to a total integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-EXO-26-005.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_006: PDF; Figure_007: PDF; Figure_008-a: PDF; Figure_008-b: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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