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CMS Physics Analysis Summaries

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2025-07-08
14:20
Highly boosted dielectron identification in proton-proton collisions at $\sqrt{s} = 13~\mathrm{TeV}$ /CMS Collaboration
Searches for highly boosted new particles that decay to dielectron pairs can be challenging, as the relatively coarse granularity of many calorimeters and the size of their effective Moli$\mathrm{\grave{e}}$re radius can lead to their misidentification as single electrons. A new technique is developed to identify electron pairs in the range of Lorentz boost $\gamma > 20$ which produce one single merged cluster in the electromagnetic calorimeter of the CMS detector. [...]
CMS-PAS-EGM-24-002.- Geneva : CERN, 2025 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_004: PDF; Figure_005-a: PDF; Figure_005-b: PDF; Figure_005-c: PDF; Figure_006-a: PDF; Figure_006-b: PDF; Figure_006-c: PDF; Figure_007: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-07-08
14:09
Measurement of the jet mass and W boson mass in hadronic decays of boosted W bosons at 13 TeV /CMS Collaboration
The jet mass of W bosons decaying to a quark-antiquark pair is measured in W+jets events from proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13~\mathrm{TeV}$. The data used were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-SMP-24-012.- Geneva : CERN, 2025 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_003-c: PDF; Figure_003-d: PDF; Figure_004: PDF; Figure_005: PDF; Figure_006: PDF; Figure_007-a: PDF; Figure_007-b: PDF; Figure_007-c: PDF; Figure_008: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_010-a: PDF; Figure_010-b: 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_014-d: PDF; Figure_015-a: PDF; Figure_015-b: PDF; Figure_015-c: PDF; Figure_016-a: PDF; Figure_016-b: PDF; Figure_016-c: PDF; Figure_017-a: PDF; Figure_017-b: PDF; Figure_017-c: PDF; Figure_018-a: PDF; Figure_018-b: PDF; Figure_018-c: PDF; Figure_019: PDF; Figure_020-a: PDF; Figure_020-b: PDF; Figure_021: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-07-08
10:58
Search for triple Higgs production in Run2 data of CMS using 4b2gamma final state. /CMS Collaboration
A search for triple Higgs boson production using the Run 2 data collected by the CMS experiment in the final state of four b jets and two photons is presented. The search is performed with proton-proton collision data at $\sqrt{s}=13~\mathrm{TeV}$, corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-HIG-24-015.- Geneva : CERN, 2025 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_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-a: PDF; Figure_008-b: PDF; Figure_009: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-07-07
19:07
Search for associated production of a Higgs boson and of two vector bosons via vector boson scattering /CMS Collaboration
A search for the production of a Higgs boson in association with two vector bosons via vector boson scattering is presented. The search uses CMS data from proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ collected from 2016 to 2018, corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-HIG-24-003.- Geneva : CERN, 2025 Figure_001-a: PDF; Figure_001-b: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003: PDF; Figure_004-a: PDF; Figure_004-b: PDF; Figure_005: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-07-07
18:38
Long-lived particle triggers at CMS: Strategy and performance in proton-proton collisions at $\sqrt{s}=13.6~\mathrm{TeV}$ /CMS Collaboration
The CMS Run 3 (2022--2026) physics program expands the scope of the search for long-lived particles at the CERN LHC with the addition of dedicated triggers and the improvement of the existing triggers. These customized triggers are described in this note, along with their performance using several models of new physics and the proton-proton collision data collected by the CMS detector during 2022--2024 at a center-of-mass energy of $13.6~\mathrm{TeV}$..
CMS-PAS-EXO-23-016.- Geneva : CERN, 2025 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003-a: PDF; Figure_003-b: PDF; Figure_003-c: PDF; Figure_004: PDF; Figure_005: PDF; Figure_006: PDF; Figure_007: PDF; Figure_008: PDF; Figure_009: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_011-a: PDF; Figure_011-b: PDF; Figure_012: PDF; Figure_013-a: PDF; Figure_013-b: PDF; Figure_014-a: PDF; Figure_014-b: PDF; Figure_015: PDF; Figure_016-a: PDF; Figure_016-b: PDF; Figure_017-a: PDF; Figure_017-b: PDF; Figure_018: PDF; Figure_019: PDF; Figure_020-a: PDF; Figure_020-b: PDF; Figure_021: PDF; Figure_022: PDF; Figure_023-a: PDF; Figure_023-b: PDF; Figure_024: PDF; Figure_025-a: PDF; Figure_025-b: PDF; Figure_026: PDF; Figure_027: PDF; Figure_028-a: PDF; Figure_028-b: PDF; Figure_029-a: PDF; Figure_029-b: PDF; Figure_030: PDF; Figure_031-a: PDF; Figure_031-b: PDF; Figure_032-a: PDF; Figure_032-b: PDF; Figure_033: PDF; Figure_034-a: PDF; Figure_034-b: PDF; Figure_035: PDF; Figure_036-a: PDF; Figure_036-b: PDF; Figure_037-a: PDF; Figure_037-b: PDF; Figure_038: PDF; Figure_039-a: PDF; Figure_039-b: PDF; Figure_039-c: PDF; Figure_040: PDF; Figure_041-a: PDF; Figure_041-b: PDF; Figure_041-c: PDF; Figure_042-a: PDF; Figure_042-b: PDF; Figure_042-c: PDF; Figure_043-a: PDF; Figure_043-b: PDF; Figure_044: PDF; Figure_045: PDF; Figure_046: PDF; Figure_047: PDF; Figure_048: PDF; Figure_049-a: PDF; Figure_049-b: PDF; Figure_050: PDF; Figure_051-a: PDF; Figure_051-b: PDF; Figure_052-a: PDF; Figure_052-b: PDF; Figure_053: PDF; Figure_054-a: PDF; Figure_054-b: PDF; Figure_055: PDF; Figure_056: PDF; Figure_057: PDF; Figure_058-a: PDF; Figure_058-b: PDF; Figure_059: PDF; Figure_060: PDF; Figure_061-a: PDF; Figure_061-b: PDF; Figure_062: PDF; Figure_063-a: PDF; Figure_063-b: PDF; Figure_063-c: PDF; Figure_063-d: PDF; Figure_064: PDF; Figure_065: PDF; Figure_066: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-06-30
21:36
Search for long-lived particles using displaced vertices with low-momentum tracks and missing transverse momentum in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ /CMS Collaboration
A search for long-lived particles using final states including a displaced vertex with low-momentum tracks, significant missing transverse momentum, and a jet from initial state radiation is presented. The search uses the proton-proton collision data at a center-of-mass energy of $13~\mathrm{TeV}$ collected by the CMS experiment at the CERN LHC in 2017 and 2018 with a total integrated luminosity of $100~\mathrm{fb}^{-1}$. [...]
CMS-PAS-EXO-24-033.- Geneva : CERN, 2025 Figure_001-a: PDF; Figure_001-b: PDF; Figure_002: PDF; Figure_003: PDF; Figure_004: PDF; Figure_005: PDF; Figure_006: PDF; Figure_007: 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_009-d: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-05-26
20:27
Search for single production of vector-like quarks decaying into a W boson and a b quark using the single-lepton final states in proton-proton collisions at 13 TeV /CMS Collaboration
A search is performed for single production of a heavy vector-like quark, decaying into a W boson and a bottom (b) quark. The analysis is based on proton-proton collision data collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosty of 138 fb$^{-1}$. [...]
CMS-PAS-B2G-22-004.- Geneva : CERN, 2025 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; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-05-25
11:31
Observation of $4\ell\gamma$ and evidence of $\mathrm ZZ\gamma$ production in proton-proton collisions at $\sqrt{s}$ = 13 TeV /CMS Collaboration
The first measurement of the production cross section of four charged leptons and a photon in proton-proton collisions is presented. The analysis utilises data collected by the CMS experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. The observed (expected) significance for the observation of $\mathrm{pp} \rightarrow 4\ell \gamma$ in a phase space with $p_\mathrm{T}^\gamma > 20~\mathrm{GeV}$, $|\eta^\gamma| < 2.4$ and $\Delta R(\ell,\gamma) > 0.5$ is 5.1 (4.1) standard deviations. The measured and expected fiducial cross sections are $\left(0.16 \pm 0.06 \right)~\mathrm{fb}$ and $\left(0.10 \pm 0.03 \right)~\mathrm{fb}$ respectively. The $4\ell\gamma$ events, with the additional requirement that the invariant mass of any of the two lepton pairs and the photon is greater than $100~\mathrm{GeV}$, are also used to search for the production of the triboson process, $\mathrm{pp} \rightarrow \mathrm{ZZ}\gamma$, with fully leptonic decays of the Z bosons, leading to the first evidence for this process, with an observed (expected) significance of 3.7 (3.0) standard deviations. The measured and expected fiducial cross sections for $\mathrm{pp} \rightarrow \mathrm{ZZ}\gamma \rightarrow 4\ell \gamma$ are $\left(0.06 \pm 0.03 \right)$ fb and $\left(0.04 \pm 0.02 \right)$ fb, respectively. Both results are in agreement with the standard model prediction within one standard deviation..
CMS-PAS-SMP-24-014.- Geneva : CERN, 2025 Figure_001-a: PDF; Figure_001-b: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003: PDF; Figure_004: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-05-21
22:03
First fully exclusive reconstruction of radiative decays of the $\mathrm{B}^{*+}$, $\mathrm{B}^{*0}$, and $\mathrm{B}^{*0}_\mathrm{s}$ mesons and measurement of their masses in proton-proton collisions at $\sqrt{s} = 13\,\text{TeV}$ /CMS Collaboration
Using a data sample corresponding to an integrated luminosity of $140\,\text{fb}^{-1}$ of proton-proton collisions collected by the CMS experiment at $\sqrt{s}= 13\,\text{TeV}$ in 2016--2018, the first full reconstruction of the three vector B meson states, $\mathrm{B}^{*+}$, $\mathrm{B}^{*0}$, and $\mathrm{B}^{*0}_\mathrm{s}$, is performed. The mass differences between the excited mesons and their corresponding ground states are measured to be $m(\mathrm{B}^{*+})-m(\mathrm{B}^{+}) = 45.277\pm0.039\pm0.021\,\text{MeV}$, $m(\mathrm{B}^{*0})-m(\mathrm{B}^{0}) = 45.471\pm0.056\pm0.024\,\text{MeV}$, and $m(\mathrm{B}^{*0}_\mathrm{s})-m(\mathrm{B}^{0}_\mathrm{s}) = 49.407\pm0.132\pm0.034\,\text{MeV}$, where the first uncertainty is statistical and the second is systematic. [...]
CMS-PAS-BPH-24-011.- Geneva : CERN, 2025 Figure_001-a: PDF; Figure_001-b: PDF; Figure_001-c: PDF; Figure_A001-d: PDF; Figure_A001-e: PDF; Figure_A001-f: PDF; Figure_A001-g: PDF; Figure_C001-h: PDF; Figure_C001-i: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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2025-05-21
11:48
Observation and differential measurement of electroweak production of one photon and two jets in proton-proton collisions at 13 TeV /CMS Collaboration
The first observation of electroweak production of a photon in association with two forward jets in proton-proton collisions is presented. The measurement uses data recorded by the CMS experiment at the LHC during 2016--2018 at a center--of--mass energy of $13~\mathrm{TeV}$, corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. [...]
CMS-PAS-SMP-19-005.- Geneva : CERN, 2025 Figure_001: PDF; Figure_002-a: PDF; Figure_002-b: PDF; Figure_003-a: PDF; Figure_003-b: 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_006: PDF; Figure_007: PDF; Figure_008: PDF; Figure_009-a: PDF; Figure_009-b: PDF; Figure_009-c: PDF; Figure_009-d: PDF; Figure_009-e: PDF; Figure_009-f: PDF; Figure_010-a: PDF; Figure_010-b: PDF; Figure_011-a: PDF; Figure_011-b: PDF; Figure_011-c: PDF; Fulltext in PDF: PDF; External link: Additional information for the analysis (restricted access)

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