#CMSPAS: Search for top quark Flavor-Changing Neutral Currents (FCNC) in multilepton final states using an effective field theory approach in proton-proton collisions at sqrt(s) = 13 TeV (CMS-PAS-TOP-25-015) https://cds.cern.ch/record/2962123 #TopQuark
CMS Publications
@cmspapers
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Updates on the latest papers (#CMSpaper) and Physics Analysis Summaries (#CMSPAS) from @CMSexperiment at #CERN. Official account managed by @clelange
#CMSpaper soon on arXiv: Search for the nonresonant production of a pair of additional Higgs bosons in the Type-X two-Higgs-doublet model in proton-proton collisions at √s = 13 TeV (CERN-EP-2025-028) https://cds.cern.ch/record/2962106 #SuperSymmetry
Search for the nonresonant production of a pair of additional Higgs bosons in the Type-X two-Higgs-doublet model in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A search is presented for the production of two additional Higgs bosons from an off-shell Z boson, where both additional particles decay to $ \tau $ lepton pairs. The search is performed with a data sample collected with the CMS detector from proton-proton collisions at the LHC at $ \sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. No deviation from the standard model background is observed. Exclusion limits are set on the Type-X two-Higgs-doublet model alignment scenario. These results rule out this model as an explanation to the potential tension between the experimental and theoretical values of the muon anomalous magnetic moment.
#CMSpaper soon on arXiv: Search for the nonresonant production of a pair of additional Higgs bosons in the Type-X two-Higgs-doublet model in proton-proton collisions at √s = 13 TeV (CERN-EP-2025-028) https://cds.cern.ch/record/2962106 #SuperSymmetry
Search for the nonresonant production of a pair of additional Higgs bosons in the Type-X two-Higgs-doublet model in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A search is presented for the production of two additional Higgs bosons from an off-shell Z boson, where both additional particles decay to $ \tau $ lepton pairs. The search is performed with a data sample collected with the CMS detector from proton-proton collisions at the LHC at $ \sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. No deviation from the standard model background is observed. Exclusion limits are set on the Type-X two-Higgs-doublet model alignment scenario. These results rule out this model as an explanation to the potential tension between the experimental and theoretical values of the muon anomalous magnetic moment.
#CMSpaper soon on arXiv: Search for Higgs boson decays into two neutral scalars with unequal masses in final states with b quarks and tau leptons in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-133) https://cds.cern.ch/record/2962099
Search for Higgs boson decays into two neutral scalars with unequal masses in final states with b quarks and tau leptons in proton-proton collisions at $ \sqrt{s}= $ 13 TeV
A search for Higgs boson (H) decays into a pair of neutral scalars $ \phi_{1} $ and $ \phi_{2} $, with $ \phi_{2} $ heavier than $ \phi_{1} $, is performed in final states with b quarks and tau leptons. Depending on the masses of the neutral scalars, $ \phi_{2} $ can undergo a cascade decay into $ \phi_{1} \phi_{1} $. For both the cascade and non-cascade scenarios, one $ \phi_{1} $ is required to decay to a pair of tau leptons. Proton-proton collision data corresponding to an integrated luminosity of 138 fb$^{-1}$ collected with the CMS detector at the LHC at $ \sqrt{s}= $ 13 TeV are analyzed. No statistically significant excess over the standard model expectation is observed. Upper limits are set on the products $ \sigma \mathcal{B}(\mathrm{H} \to \phi_{1} \phi_{2} \to 3\phi_{1} \to 2\tau 4\mathrm{b}) $ and $ \sigma \mathcal{B}(\mathrm{H} \to \phi_{1} \phi_{2})\mathcal{B}(\phi_{1} \to 2\tau)\mathcal{B}(\phi_{2} \to 2\mathrm{b}) $ where $ \sigma $ is the Higgs boson production cross section. The observed upper limits range between 0.9 and 36.8 pb at 95\% confidence level, depending on the mass hypothesis and decay scenario.
#CMSpaper soon on arXiv: First measurements of vector boson scattering in W^±W^± and WZ production in all-leptonic final states at √s = 13.6 TeV (CERN-EP-2026-126) https://cds.cern.ch/record/2962072 #StandardModel
First measurements of vector boson scattering in $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} $ and $ \mathrm{W}\mathrm{Z} $ production in all-leptonic final states at $ \sqrt{s} = $ 13.6 TeV
The production cross sections of $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} $ and WZ boson pairs in association with two jets in proton-proton collisions are measured at $ \sqrt{s}= $ 13.6 TeV. The data sample corresponds to an integrated luminosity of 171 fb$ ^{-1} $, collected with the CMS detector during 2022--2024. The measurements are performed in the leptonic decay modes: $ \mathrm{W}^{\pm}\mathrm{Z} \to \ell^{\pm}\nu{\ell^{\prime\pm}}{\ell^{\prime\mp}} $ and $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} \to \ell^\pm\nu {\ell}^{\prime\pm}\nu $, where $ \ell, {\ell}{\prime} = \mathrm{e} $ or $ \mu $. The electroweak productions of $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} $ and WZ bosons are each observed with a significance greater than five standard deviations from the background-only hypothesis. Differential fiducial cross sections as functions of several observables are also measured.
#CMSpaper soon on arXiv: Search for new physics in triple boson production in proton-proton collisions at √s = 13 TeV using the effective field theory approach (CERN-EP-2026-041) https://cds.cern.ch/record/2961978 #StandardModel
Search for new physics in triple boson production in proton-proton collisions at $ \sqrt{s} = $ 13 TeV using the effective field theory approach
A search for new physics in the production of three massive gauge bosons ($ \mathrm{V}\mathrm{V}\mathrm{V} $, where V is a W or Z boson) is presented. The event selection is most effective in the Lorentz-boosted regime in which all three bosons have a transverse momentum ($ p_{\mathrm{T}} $) above 200 GeV. Standard model (SM) processes contribute few events in this regime. When a boosted W or Z boson decays hadronically, the decay products tend to form a large-radius jet with substructure that reflects the presence of two quarks from the decay; such jets are called V-tagged jets. Special techniques to reconstruct and select V-tagged jets are applied. Events are categorized according to the number and kinematic features of charged leptons and V-tagged jets. Event yields are obtained in bins of a suitable kinematic variable such as the scalar $ p_{\mathrm{T}} $ sum of the reconstructed objects in the event. No excess over SM expectations is observed. Bounds are placed on Wilson coefficients for a set of mass dimension-6 and -8 operators in the framework of SM effective field theory. The two most stringent bounds placed by this analysis are $ -0.13 < c_\mathrm{W}/\Lambda^2 < 0.12 \text{TeV}^{-2} $ and $ -0.24 < c_{\text{Hq3}}/\Lambda^2 < 0.21 \text{TeV}^{-2} $ at 95\% CL, where $ c_\mathrm{W} $ and $ c_{\text{Hq3}} $ are dimension-6 Wilson coefficients in the Warsaw basis and $ \Lambda $ is the mass scale of new physics.
#CMSpaper soon on arXiv: Constraints on anomalous Higgs boson couplings to vector bosons and fermions using the γγ final state in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-100) https://cds.cern.ch/record/2961973 #HiggsBoson
Constraints on anomalous Higgs boson couplings to vector bosons and fermions using the $ \gamma\gamma $ final state in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
Possible anomalous couplings of the Higgs boson to vector bosons and fermions are studied using Higgs boson candidates decaying to a pair of photons. The study is based on proton-proton collision data at $ \sqrt{s} = $ 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Events with Higgs boson candidates produced via gluon fusion, electroweak vector boson fusion and in association with a vector boson, are categorized using matrix element techniques and multivariate discriminants. The $ CP $ properties of the Higgs boson couplings to gluons through loops of heavy particles, as well as the tensor structure of its interactions with two electroweak bosons, are investigated. The results are interpreted in terms of the fractional contributions of anomalous Higgs boson couplings to the total production cross section of each process and are found to be consistent with the standard model expectations.
#CMSpaper soon on arXiv: Search for single vector-like quark production in opposite-sign dilepton final states in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-115) https://cds.cern.ch/record/2961937 #NewPhysics
Search for single vector-like quark production in opposite-sign dilepton final states in proton-proton collisions at $ \sqrt{s}= $ 13 TeV
A search is presented for single production of a vector-like top quark $ \mathrm{T} $, decaying into the standard model top quark and Higgs boson, in a final state including two opposite-sign leptons (electrons or muons), jets, and missing transverse momentum. The data were recorded by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC in the years 2016--2018, and corresponding to an integrated luminosity of up to 138 fb$ ^{-1} $. No excess in data over the background expectations is observed. Upper limits at 95\% confidence level on the product of the $ \mathrm{T} $ production cross section and its decay branching fraction to tH are set, ranging from 2.0 pb at a T mass of 600 GeV to 0.1 pb at 1000 GeV. This is the first search in the $ \mathrm{T} \to \mathrm{t} \mathrm{H} $ channel in opposite-sign dilepton final states.
#CMSpaper soon on arXiv: Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at √s = 13 and 13.6 TeV (CERN-EP-2026-098) https://cds.cern.ch/record/2961933
Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at $ \sqrt{s} = $ 13 and 13.6 TeV
A first dedicated search for pair production of new scalars predicted by the Inert Doublet Model is performed using proton-proton collisions. Data were collected with the CMS detector at the CERN LHC at $\sqrt{s} = $13 and 13.6 TeV, corresponding to integrated luminosities of 138 fb$ ^{-1} $ and 35 fb$ ^{-1} $, respectively. Within this model, four additional scalar bosons ($\mathrm{H}$, $\mathrm{A}$, $ \mathrm{H}^{+} $, and $ \mathrm{H}^{-} $) are predicted. Through an additional discrete symmetry, the lightest new scalar, H, is stable, rendering it a viable dark matter candidate. These candidates can originate from quark-antiquark annihilation producing an offshell Z boson that decays to a pair of the new scalars. The target final state consists of exactly two opposite-charge same-flavour leptons (electrons or muons), with missing transverse momentum due to the stable neutral scalars, and very little hadronic activity. A parameterised neural network is used to separate the signal from the standard model background. No significant excess of events is observed. Exclusion limits at 95% confidence level are set on the production cross section of the two new neutral scalars, $\mathrm{H}$ and $\mathrm{A}$, expressed in terms of their masses, $ m_{\mathrm{H}} $ and $ m_{{\mathrm{A}} } $, in the $ m_{\mathrm{H}} $ vs. $ m_{{\mathrm{A}} } -m_{\mathrm{H}} $ plane. The observed (expected) exclusion region reaches $ m_{\mathrm{H}}=108 (106) \text{GeV} $ for $ m_{{\mathrm{A}} } -m_{\mathrm{H}}=78 (76) \text{GeV} $ and at $ m_{\mathrm{H}}= $ 70 GeV, covers the range of $ m_{{\mathrm{A}} } -m_{\mathrm{H}}= $ 40-90 (35-90) GeV.
#CMSPAS: Search for leptoquarks coupling to third-generation quarks and first- or second-generation leptons at 13.6 TeV (CMS-PAS-B2G-25-011) https://cds.cern.ch/record/2961763 #NewPhysics