نتایج جستجو برای: boson
تعداد نتایج: 15420 فیلتر نتایج به سال:
We discuss the strength of the trilinear Higgs boson coupling in technicolor (or composite) models in a model independent way. The coupling is determined as a function of a very general ansatz for the technicolor self-energy, and turns out to be equal or smaller than the one of the standard model Higgs boson depending on the dynamics of the theory. With this trilinear coupling we estimate the c...
The possibility of detecting a Higgs boson through several production and decay channels is instrumental to the measurement of its couplings. In this paper we study the pp → tt̄H, H → τ+τ− channel at the LHC, for the case of a scalar Higgs boson, and use the obtained results to improve on existing strategies toward a model independent determination of the Higgs boson couplings. The case of a sca...
We present a search for the production of a new heavy gauge boson W ′ that decays to a top quark and a bottom quark. We have analyzed 230 pb−1 of data collected with the DØ detector at the Fermilab Tevatron collider at a center-of-mass energy of 1.96 TeV. No significant excess of events above the standard model expectation is found in any region of the final state invariant mass distribution. W...
We summarize the status of Higgs boson searches at the upgraded Fermilab Tevatron performed by the DØ and CDF collaborations. We report on three categories of searches, namely the search for the Standard Model Higgs boson (pp̄ → H, WH or ZH , withH → WW ∗ and/or H → bb̄), the search for the minimal supersymmetric Higgs boson using pp̄ → hbb̄ → bb̄bb̄ and pp̄ → hX → ττX, and the search for doubly charg...
We show that radiative corrections to the Higgs potential in supersymmetric theories with large tan generically lead to large diierences in the light Higgs boson decay branching fractions compared to those of the standard model Higgs boson. In contrast, the light Higgs boson production rates are largely unaaected. We identify W h associated production followed by Higgs boson decays to photons o...
The existence of certain TeV suppressed higher-dimension operators may open up new decay channels for the Higgs boson to decay into lighter right-handed neutrinos. These channels may dominate over all other channels if the Higgs boson is light. For a Higgs boson mass larger than 2mW the new decays are subdominant yet still of interest. The right-handed neutrinos have macroscopic decay lengths a...
We compute the leading logarithmic radiative corrections to the lightest Higgs mass in the NMSSM involving the electroweak gauge couplings and the NMSSM specific Yukawa couplings λ and κ (including all mixed combinations), which are induced by chargino, neutralino and Higgs boson loops. The effect of the NMSSM specific Yukawa couplings λ and κ is to increase the upper bound on the lightest Higg...
The sensitivity of Standard Model Higgs boson searches at the Tevatron experiments with a mass 135 < MH < 190GeV/c 2 using the channel H → WW → ll/pT (l = e, μ) is discussed. Three new event selections involving Higgs in association with one or two high PT hadronic jets are discussed. Using Leading Order Matrix Elements and a conservative cut-based analysis a 95% confidence level exclusion on σ...
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