Search for New Resonances Decaying to a Top and a Bottom Quark in p Collisions at s = 1.96 TeV
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چکیده
This note reports on a search for W ′-like resonances decaying to tb in the full data set of proton-antiproton collisions at √ s = 1.96 TeV recorded by the CDF II detector at the Tevatron, corresponding to an integrated luminosity of 9.5 fb−1. No significant excess above SM prediction is found. Using a benchmark W ′ → tb left-right symmetric model, we place 95% C.L. mass-dependent upper limits on the W ′ production cross section times branching ratio to tb. Assuming a W ′ with SM-like couplings and allowed (forbidden) decay to leptons, we exclude W ′ → tb for W ′ masses below 860 (880) GeV/c2. Relaxing the hypothesis on SM-like couplings, we exclude W ′ boson coupling strength values gW ′ as a function of W ′ mass down to gW ′ = 0.4gSM for MW ′ = 300 GeV/c2. Our limits are significantly stronger than the LHC ones below MW ′ around 750 GeV/c 2, and extend to W ′ masses as low as 300 GeV/c2.
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