Search
Results
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Measurement of the inclusive and differential tt¯γ cross sections in the single-lepton channel and EFT interpretation at √s = 13 TeV
(2021)Journal of High Energy PhysicsThe production cross section of a top quark pair in association with a photon is measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The data set, corresponding to an integrated luminosity of 137 fb−1, was recorded by the CMS experiment during the 2016–2018 data taking of the LHC. The measurements are performed in a fiducial volume defined at the particle level. Events with an isolated, highly energetic lepton, at ...Journal Article -
Search for a heavy Higgs boson decaying into two lighter Higgs bosons in the ττbb final state at 13 TeV
(2021)Journal of High Energy PhysicsA search for a heavy Higgs boson H decaying into the observed Higgs boson h with a mass of 125 GeV and another Higgs boson hS is presented. The h and hS bosons are required to decay into a pair of tau leptons and a pair of b quarks, respectively. The search uses a sample of proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1. Mass ranges of ...Journal Article -
CMS PYTHIA 8 colour reconnection tunes based on underlying-event data
(2023)The European Physical Journal CNew sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the PYTHIA 8 event generator, are obtained based on the default CMS PYTHIA 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s√=7 and 13TeV, and by the CDF experiment at 1.96TeV are used to constrain the parameters of ...Journal Article -
Search for CP violation in t t ¯ H and tH production in multilepton channels in proton-proton collisions at √s = 13 TeV
(2023)Journal of High Energy PhysicsThe charge-parity (CP) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the t t ¯ H and tH associated production, using 138 fb −1 of data collected in proton-proton collisions at s = 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H → ττ and the top quarks decay via t → Wb: the W bosons decay either ...Journal Article -
Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 TeV
(2023)Physics Letters BResults are presented of a search for a heavy Majorana neutrino Image 1 decaying into two same-flavor leptons ℓ (electrons or muons) and a quark-pair jet. A model is considered in which the Image 1 is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at √s=13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb⁻¹. The ...Journal Article -
Search for Exotic Higgs Boson Decays H → A A → 4γ with Events Containing Two Merged Diphotons in Proton-Proton Collisions at √s = 13 TeV
(2023)Physical Review LettersWe present the first direct search for exotic Higgs boson decays H → AA, A → γγ in events with two photonlike objects. The hypothetical particle A is a low-mass spin-0 particle decaying promptly to a merged diphoton reconstructed as a single photonlike object. We analyze the data collected by the CMS experiment at √s=13TeV corresponding to an integrated luminosity of 136 fb⁻¹. No excess above the estimated background is found. We set upper ...Journal Article -
Constraints on anomalous Higgs boson couplings to vector bosons and fermions from the production of Higgs bosons using the ττ final state
(2023)Physical Review DA study of anomalous couplings of the Higgs boson to vector bosons and fermions is presented. The data were recorded by the CMS experiment at a center-of-mass energy of pp collisions at the LHC of 13 TeV and correspond to an integrated luminosity of 138 fb⁻¹. The study uses Higgs boson candidates produced mainly in gluon fusion or electroweak vector boson fusion at the LHC that subsequently decay to a pair of τ leptons. Matrix-element and ...Journal Article -
Search for a vector-like quark T′ → tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at √s = 13 TeV
(2023)Journal of High Energy PhysicsA search for the electroweak production of a vector-like quark T′, decaying to a top quark and a Higgs boson is presented. The search is based on a sample of proton-proton collision events recorded at the LHC at √s = 13 TeV, corresponding to an integrated luminosity of 138 fb⁻¹. This is the first T′ search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet T′ states with masses up to 1.1 TeV, the excellent ...Journal Article -
Search for pair-produced vector-like leptons in final states with third-generation leptons and at least three b quark jets in proton-proton collisions at √s = 13 TeV
(2023)Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy PhysicsThe first search is presented for vector-like leptons (VLLs) in the context of the “4321 model”, an ultraviolet-complete model with the potential to explain existing B physics measurements that are in tension with standard model predictions. The analyzed data, corresponding to an integrated luminosity of 96.5 fb⁻¹, were recorded in 2017 and 2018 with the CMS detector at the LHC in proton-proton collisions at √s = 13 TeV. Final states with ...Journal Article -
Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson
(2023)Physical Review DA data sample containing top quark pairs (tt¯) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138 fb⁻¹ of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two ...Journal Article