17 research outputs found

    Immune Escape

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    Search for a narrow ttˉt\bar t resonance in ppˉp\bar p collisions at s=1.96 TeV\sqrt s=1.96\ \text{TeV}

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    We report a search for a narrow ttˉt\bar t resonance that decays into a lepton+jets\text{lepton+jets} final state based on an integrated luminosity of 5.3  fb−15.3 \text{ fb}^{−1} of proton-antiproton collisions at s=1.96 TeV\sqrt s=1.96\ \text{TeV} collected by the D0 Collaboration at the Fermilab Tevatron Collider. We set upper limits on the production cross section of such a resonance multiplied by its branching fraction to ttˉt\bar t. We exclude a leptophobic topcolor Z′Z^′ at the 95% confidence level for masses below 835 GeV (940 GeV) if its width is 1.2% (3%) of its mass. We also exclude color octet vector bosons (colorons) with masses below 775 GeV
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