Search for heavy resonances decaying into a Z boson and a Higgs boson in the 2l2b final state in pp collisions at s=13\sqrt{s}=13 TeV

A search for heavy resonances decaying to a Higgs boson and a Z boson is presented. The analysis is based on the data collected in 2015 with the CMS detector√at a center-of-mass energy s = 13 TeV, corresponding to an integrated luminosity of 2.51 f b−1 . The Higgs bosons are reconstructed from high momentum b¯bquark pairs that are detected as a single massive jet, while the Z bosons are reconstructed from electron pairs and muon pairs. The analysis is separated inelectron and muon channels, with single and double b-tag categories. A 95%upper limit on the production cross section of σX × B(X → ZH) is derived fromthe combination of four categories with a limit of 0.063 pb to 0.265 pb for mX from800 to 4000 GeV.Thesis Supervisor: Shin-Shan Eiko YuTitle: Associate Professo

Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

A search for heavy resonances decaying to a Higgs boson and a vector boson is presented. The analysis is performed using data samples collected in 2015 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to integrated luminosities of 2.2-2.5 inverse femtobarns. The search is performed in channels in which the vector boson decays into leptonic final states ($\mathrm{Z} \to \nu\nu$, $\mathrm{W}\to \ell \nu$, and $\mathrm{Z} \to \ell \ell$, with $\ell = \mathrm{e}$, $\mu$), while the Higgs boson decays to collimated b quark pairs detected as a single massive jet. The discriminating power of a jet mass requirement and a b jet tagging algorithm are exploited to suppress the standard model backgrounds. The event yields observed in data are consistent with the background expectation. In the context of a theoretical model with a heavy vector triplet, a resonance with mass less than 2 TeV is excluded at 95% confidence level. The results are also interpreted in terms of limits on the parameters of the model, improving on the reach of previous searches

Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

A search for heavy resonances decaying to a Higgs boson and a vector boson is presented. The analysis is performed using data samples collected in 2015 by the CMS experiment at the LHC in proton–proton collisions at a center-of-mass energy of 13 TeV, corresponding to integrated luminosities of 2.2–2.5 fb$^{−1}$ . The search is performed in channels in which the vector boson decays into leptonic final states (Z → $\nu\nu$ , W → ℓ $\nu$, and Z → ℓℓ , with ℓ = e, $\mu$), while the Higgs boson decays to collimated b quark pairs detected as a single massive jet. The discriminating power of a jet mass requirement and a b jet tagging algorithm are exploited to suppress the standard model backgrounds. The event yields observed in data are consistent with the background expectation. In the context of a theoretical model with a heavy vector triplet, a resonance with mass less than 2 TeV is excluded at 95% confidence level. The results are also interpreted in terms of limits on the parameters of the model, improving on the reach of previous searches