CMS Publications#CMSpaper: Search for single vector-like quark production in opposite-sign dilepton final states in proton-proton collisions at √s = 13 TeV (arXiv:2605.13649) https://arxiv.org/abs/2605.13649 #NewPhysics
#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.
#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
#CMSPAS: Search for pair-produced vector-like top quarks decaying to Lorentz-boosted top quarks and scalars in proton-proton collisions at √s = 13 TeV (CMS-PAS-B2G-24-016) https://cds.cern.ch/record/2961613 #NewPhysics
#CMSPAS: Search for heavy neutral leptons in top quark decays with same-sign dilepton final states in proton-proton collisions at √s = 13 TeV (CMS-PAS-B2G-24-023) https://cds.cern.ch/record/2961612 #NewPhysics
#CMSPAS: Search for low-mass resonances decaying into a quark-antiquark pair produced with an initial state radiation photon in proton-proton collisions at √s = 13 TeV (CMS-PAS-EXO-24-027) https://cds.cern.ch/record/2961567 #NewPhysics
#CMSPAS: Search for resonant new phenomena in high-mass dilepton final states at √s = 13.6 TeV (CMS-PAS-EXO-25-021) https://cds.cern.ch/record/2961528 #NewPhysics
#CMSPAS: Search for low-mass resonances decaying to a pair of muons in proton-proton collisions at sqrt(s) = 13.6 TeV (CMS-PAS-EXO-25-019) https://cds.cern.ch/record/2961501 #NewPhysics
#CMSPAS: Search for heavy top quark partners with charge 5/3 in the single-lepton final state in proton-proton collisions at sqrts = 13 TeV (CMS-PAS-B2G-24-005) https://cds.cern.ch/record/2961473 #NewPhysics
#CMSpaper: Search for light charged Higgs bosons decaying to charm and strange quarks in tt events in proton-proton collisions at √s = 13 TeV (arXiv:2604.27795) https://arxiv.org/abs/2604.27795 #NewPhysics
Search for light charged Higgs bosons decaying to charm and strange quarks in $\mathrm{t\bar{t}}$ events in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search is presented for a light charged Higgs boson H$^\pm$ in top quark pair production ($\mathrm{t\bar{t}}$), where one of the top quarks decays to an H$^\pm$ and a bottom quark, while the other decays to a W$^\mp$ boson and a bottom quark. The H$^\pm$ is assumed to decay into a charm and a strange quark, whereas the W$^\mp$ boson decays into a charged lepton (electron or muon) and a neutrino. Results are reported based on proton-proton collision data at $\sqrt{s}$ = 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. The analysis probes H$^\pm$ masses in the range 40 to 160 GeV using the invariant mass spectrum of the two light jets, where light jets are defined as jets that do not satisfy the bottom quark tagging requirement. The observed yield is found to be consistent with standard model predictions. Upper limits are set on the branching fraction $\mathcal{B}$(t $\to$ H$^\pm$ b), with values in the range of 0.07$-$1.12% at 95% confidence level, under the assumption that $\mathcal{B}$(H$^\pm$ $\to$ cs) = 100%. These are the first direct limits on charged Higgs bosons produced in top quark decays for masses between 40 and 50 GeV, and the most stringent limits to date in the 70$-$110 GeV range.