Searches for the Higgs boson decaying to W+W−→ℓ+νℓ−ν¯ with the CDF II detector

Le résumé fourni par la source

We present a search for a standard model Higgs boson decaying to two $W$ bosons that decay to leptons using the full data set collected with the CDF II detector in $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ $p\overline{p}$ collisions at the Fermilab Tevatron, corresponding to an integrated luminosity of $9.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. We obtain no evidence for production of a standard model Higgs boson with mass between 110 and $200\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, and place upper limits on the production cross section within this range. We exclude standard model Higgs boson production at the 95% confidence level in the mass range between 149 and $172\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, while expecting to exclude, in the absence of signal, the range between 155 and $175\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. We also interpret the search in terms of standard model Higgs boson production in the presence of a fourth generation of fermions and within the context of a fermiophobic Higgs boson model. For the specific case of a standard-model-like Higgs boson in the presence of fourth-generation fermions, we exclude at the 95% confidence level Higgs boson production in the mass range between 124 and $200\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, while expecting to exclude, in the absence of signal, the range between 124 and $221\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.

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