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CMS Physics Analysis Summaries

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2026-05-18
20:01
Search for pair-produced vector-like top quarks decaying to Lorentz-boosted top quarks and scalars in proton-proton collisions at $\sqrt{s}=$ 13 TeV /CMS Collaboration
The first search for pair-produced vector-like top quarks, $\mathrm{T}$, decaying to a new scalar boson $\phi$ and a standard model (SM) top quark is presented. The search targets events containing a photon pair originating from the decay of one of the scalar bosons, accompanied by all-hadronic decays of the SM top quark pair. [...]
CMS-PAS-B2G-24-016.- 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_003-e: PDF; Figure_003-f: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_004-c: PDF; Figure_004-d: PDF; Figure_004-e: PDF; Figure_004-f: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_005-c: PDF; Figure_005-d: PDF; Figure_005-e: PDF; Figure_005-f: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_006-c: PDF; Figure_006-d: PDF; Figure_006-e: PDF; Figure_006-f: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_008-a: PDF; Figure_008-b: PDF; Figure_008-c: PDF; Figure_008-d: PDF; Figure_008-e: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-18
20:01
Search for heavy neutral leptons in top quark decays with same-sign dilepton final states in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ /CMS Collaboration
The first search for a Majorana$\text{-}$type heavy neutral lepton (N) produced in top quark decays with the CMS detector is reported. In type$\text{-}$I seesaw models, where the N mixes with the first two generations of neutrinos, these heavy leptons lead to novel top quark decay modes that violate lepton number conservation. [...]
CMS-PAS-B2G-24-023.- Geneva : CERN, 2026 Figure_001-a: PDF; Figure_001-b: PDF; Figure_001-c: PDF; Figure_001-d: 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_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_007-a: PDF; Figure_007-b: PDF; Figure_008: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_010-c: PDF; Figure_010-d: PDF; Figure_010-e: PDF; Figure_010-f: PDF; Figure_011-a: PDF; Figure_011-b: PDF; Figure_011-c: PDF; Figure_011-d: PDF; Figure_012-a: PDF; Figure_012-b: PDF; Figure_013-a: PDF; Figure_013-b: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-18
16:28
Search for anomalous couplings in WW and WZ production with single-lepton final states at 13 TeV /CMS Collaboration
A search for deviations from the standard model in a generic manner using an effective field theory (EFT) approach is carried out using the proton-proton collision dataset recorded by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. In this study we constrain Wilson coefficients (WCs) corresponding to dimension six EFT operators that would lead to anomalous gauge boson self and vector boson to quark couplings. We consider diboson (WW and WZ) production processes with one W boson decaying to (anti-)lepton plus anti-neutrino (neutrino) and the second W or Z boson decaying hadronically. Since the contribution from anomalous couplings is expected to be most visible at high energy scales, we focus on final states where the hadronic decays from the W and Z bosons merge into a single large-radius jet. A dedicated machine-learning based classifier is employed to separate such jets from vector boson decays to those from background processes. We report the most stringent constraints to date on the WCs of operators corresponding to anomalous triple gauge boson couplings. The bounds set on vector bosons' to quark couplings are competitive to those from previous inclusive jet measurements..
CMS-PAS-SMP-25-001.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_002-c: PDF; Figure_003: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_004-c: PDF; Figure_004-d: PDF; Figure_004-e: PDF; Figure_004-f: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_005-c: PDF; Figure_005-d: PDF; Figure_006: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_007-c: PDF; Figure_008: PDF; Figure_009: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_010-c: PDF; Figure_010-d: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-18
13:50
Search for low-mass resonances decaying into a quark-antiquark pair produced with an initial state radiation photon in proton-proton collisions at $\sqrt{s}$=13 TeV /CMS Collaboration
A search for low-mass resonances decaying to a quark-antiquark pair in the mass range of 10 to 150 GeV is presented. This search uses proton-proton collision data at $\sqrt{s}$=13 TeV, collected by the CMS detector at the CERN LHC in 2016--2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. [...]
CMS-PAS-EXO-24-027.- Geneva : CERN, 2026 Figure_001-a: PDF; Figure_001-b: PDF; Figure_001-c: PDF; Figure_002: 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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2026-05-18
13:10
Observation of a peaking structure in the Y(1S)phi(1020) channel in proton-proton collisions at sqrt(s) = 13 TeV /CMS Collaboration
The $\Upsilon(1S) \phi(1020)$ invariant mass spectrum is investigated with an event sample of proton-proton collisions at $\sqrt{s}= 13\,\text{TeV}$, collected by the CMS experiment at the LHC in 2016--2018 and corresponding to an integrated luminosity of $140\,\text{fb}^{-1}$. A peaking structure is observed at a $\Upsilon(1S) \phi(1020)$ invariant mass of $M_{\Upsilon\phi} = 10,512.60 \pm 0.21\text{(stat)} \pm 0.20\text{(syst)} \pm 0.11\;(M_{\Upsilon}) \text{MeV}$, where the last uncertainty reflects the precision of the world-average determination of the $\Upsilon(1S)$ meson mass. [...]
CMS-PAS-BPH-25-009.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002: PDF; Figure_003: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-17
20:55
Search for resonant new phenomena in high-mass dilepton final states at $\sqrt{s}=13.6~\mathrm{TeV}$ /CMS Collaboration
A search for heavy new resonances decaying into pairs of electrons or muons is presented. The search uses proton-proton collision data at a centre-of-mass energy of $\sqrt{s}=13.6~\mathrm{TeV}$, collected by the CMS experiment at the LHC during 2022-2025 and corresponding to an integrated luminosity of $283~\mathrm{fb}^{-1}$. [...]
CMS-PAS-EXO-25-021.- Geneva : CERN, 2026 Figure_001-a: PDF; Figure_001-b: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_002-c: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_003-c: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_004-c: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_005-c: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-17
20:45
Event activity dependence of relative Y(nS) production in pPb collisions at 8.16 TeV /CMS Collaboration
The relative production of the excited bottomonium states, $\Upsilon$(2S) and $\Upsilon$(3S), with respect to the ground state $\Upsilon$(1S) is measured via the dimuon decay channel in proton-lead collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}} =$ 8.16 TeV. The analysis is based on data collected in 2016 with the CMS detector at the LHC, corresponding to an integrated luminosity of $175\,\text{nb}^{-1}$. [...]
CMS-PAS-HIN-25-005.- Geneva : CERN, 2026 Figure_001-a: PDF; Figure_001-b: PDF; Figure_002: PDF; Figure_003: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_005: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_008: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_011: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2026-05-17
20:00
Measurements of Lambda hyperon spin correlations in proton-proton and proton-lead collisions /CMS Collaboration
The spin correlations of $\Lambda\Lambda$, $\Lambda\overline{\Lambda}$, and $\overline{\Lambda}\overline{\Lambda}$ hyperon pairs are measured in proton-proton (pp) collisions at $\sqrt{s}=13$ TeV and proton-lead (pPb) collisions at $\sqrt{s_\mathrm{NN}} =$ 8.16 TeV at the LHC. The data were collected with the CMS detector, corresponding to integrated luminosities of 28.6 $\mathrm{pb}^{-1}$ and 186 $\mathrm{nb}^{-1}$ for pp and pPb collisions, respectively. [...]
CMS-PAS-HIN-26-002.- Geneva : CERN, 2026 Figure_001: PDF; Figure_002: PDF; Figure_003: PDF; Figure_004: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_006: PDF; Figure_007: PDF; Figure_008: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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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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