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CMS Conference Reports

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2026-04-22
11:52
Study of rare decays in the flavor sector at CMS / Buonsante, Marco (INFN, Bari ; Bari U.) /CMS Collaboration
Rare decays offer a unique window on the flavour structure of the Standard Model, as their strongly suppressed rates make them sensitive to small deviations induced by new physics. In this proceeding, we present CMS Run~3 results on rare decays in proton-proton collisions at $\sqrt{s}=13.6\,\mathrm{TeV}$, including the searches for rare $B_{(s)}^0\to\mu^+\mu^-\mu^+\mu^-$ and $\tau\to3\mu$ decays and the first observation of the $\eta\to\mu^+\mu^-e^+e^-$ decay..
CMS-CR-2026-039.- Geneva : CERN, 2026 - 5 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, It, 22 - 29 Mar 2026

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2026-04-22
11:52
Searches for New Physics at High Object Masses with CMS / Malara, Andrea (Brussels U.) /CMS Collaboration
Searches at high object masses probe both resonant production of new particles and nonresonant distortions of Standard Model spectra. This contribution follows the material presented in the Moriond Electroweak 2026 talk and summarizes recent CMS results in this regime: the Run~2 combination of heavy vector boson searches, the Run~3 search for $W^\prime \to \ell \nu$, the Run~2 dijet angular analysis, and searches for pair-produced dijet resonances in inclusive and $b$-tagged final states. No significant deviation from the SM expectation is observed, and the new results extend the sensitivity of CMS to multi-TeV scales in several benchmark scenarios..
CMS-CR-2026-037.- Geneva : CERN, 2026 - 7 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-22
11:52
Multiboson and VBS measurements in ATLAS and CMS / Folgueras, Santiago (Oviedo U.) /ATLAS and CMS Collaborations
A review of recent multiboson and vector boson scattering (VBS) measurements from the ATLAS and CMS Collaborations at the LHC is presented. Results are reported from precision diboson cross-section measurements, novel CP-sensitive and polarisation observables in $W\gamma$ production, VBS observations in semileptonic and fully leptonic final states including the first measurements at $\sqrt{s}=13.6\tev$, and observations of triboson processes. [...]
CMS-CR-2026-034.- Geneva : CERN, 2026 - 7 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-22
11:52
First look at $W^{\pm}W^{\pm}$ and $W^{\pm}Z$ vector boson scattering at $\sqrt{s}$ = 13.6 TeV / Ghimiray, Monika (NCBJ, Swierk) /CMS Collaboration
The measurement of the production cross-section for the $W^{\pm}W^{\pm}$ and $W^{\pm}Z$ channels at $\sqrt{s}=13.6$ TeV is presented using 171 $\mathrm fb^{-1}$ of proton-proton collision data collected with the CMS detector during 2022-2024, in the fully leptonic final states in association with two jets. The electroweak $W^{\pm}Z$ process is observed with a significance of about $7\sigma$, while the electroweak $W^{\pm}W^{\pm}$ signal is established well above $5\sigma$..
CMS-CR-2026-032.- Geneva : CERN, 2026 - 5 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-22
11:52
Searches for other exotica / Koraka, Charis Kleio (Wisconsin U., Madison) /ATLAS and CMS Collaborations
A review of recent searches for exotic, beyond the Standard Model (BSM) physics signatures, performed by the ATLAS and CMS Collaborations is presented, covering results shown at the 60th Rencontres de Moriond Electroweak session. The searches discussed target unconventional signatures that go beyond the standard paradigm of high-mass resonances and large missing transverse momentum Heavy Neutral Leptons in W boson decays, exotic Higgs decays to pairs of scalars with unequal masses, Soft Unclustered Energy Patterns (SUEPs) in both hadronic and leptonic channels, s-channel production of lepton-enriched semi-visible jets, and a model-independent anomaly detection search in multi-lepton final states. [...]
CMS-CR-2026-031.- Geneva : CERN, 2026 - 7 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-22
11:49
Searches for low-mass resonances at ATLAS and CMS / Collard, Caroline (Strasbourg, IPHC) /ATLAS and CMS Collaborations
These proceedings present the latest results on searches for low-mass resonances performed by the ATLAS and CMS collaborations..
CMS-CR-2026-030.- Geneva : CERN, 2026 - 7 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-22
11:49
Search for resonances in four top quark events in the 2 lepton final state / Stafford, Dominic William (DESY) /CMS Collaboration
A first search is presented for BSM resonances in four top quark production in the 2 lepton channel, using $138\mathrm{fb}^{-1}$ $pp$ data collected at $\sqrt{s}=13$~TeV, and $35\mathrm{fb}^{-1}$ $\sqrt{s}=13.6$~TeV $pp$ data. No significant excess is observed; limits are set on vector Z', scalar, pseudoscalar and ALP mediators. [...]
CMS-CR-2026-029.- Geneva : CERN, 2026 - 5 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-22
11:49
Highlights of recent results from the CMS experiment at the LHC / Gallinaro, Michele (LIP, Lisbon) /CMS Collaboration
The first period of operations (2010-2026) of the Large Hadron Collider (LHC), also referred to as Phase-1, consolidated the success of the standard model (SM) of particle physics, proving it to be an impressively accurate description of fundamental interactions. In particular, the discovery of the Higgs boson in 2012 and the measurement of its dominant interactions confirmed the 'Higgs mechanism' as an appropriate description of electroweak symmetry breaking (EWSB) within the current experimental and theory uncertainties. [...]
CMS-CR-2026-028.- Geneva : CERN, 2026 - 17 p. Fulltext: PDF;
In : Corfu2025 Workshop on the Standard Model and Beyond, Corfu, Gr, 24 Aug - 3 Sep 2025

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2026-04-22
11:49
Rare top quark production (tt+X) and top quark properties / Sanchez Cruz, Sergio (Oviedo U.) /ATLAS and CMS Collaborations
The production of top quarks is one of the most relevant production modes at the LHC, and allow for precise measurement of the properties of this particle. Top quarks are also produced through rarer mechanisms, including the production of multiple top quarks or the associated production of top quarks with electroweak gauge bosons. [...]
CMS-CR-2026-026.- Geneva : CERN, 2026 - 7 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-04-07
12:18
Physics objects in CMS Run 3 / Seidel, Markus (Riga Tech. U.) /CMS Collaboration
Abstract In these proceedings we review the reconstruction of the physics objects used by the CMS experiment during LHC Run 3 at 13.6 TeV, including charged leptons, photons, jets, and missing transverse momentum. The performance of physics object reconstruction and their calibration are critical for physics analysis. [...]
CMS-CR-2026-010.- Geneva : CERN, 2026 - 12 p. Fulltext: PDF;
In : 18th International Workshop on Top Quark Physics (TOP2025), Seoul, South Korea, 21 - 26 Sep 2025

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