Search for Technicolor Particles Produced in Association with a W Boson at CDF

We present a search for the technicolor particles $ρ_{T}$ and $π_{T}$ in the process $p\bar{p} \to ρ_{T} \to Wπ_{T}$ at a center of mass energy of $\sqrt{s}=1.96 \mathrm{TeV}$. The search uses a data sample corresponding to approximately $1.9 \mathrm{fb}^{-1}$ of integrated luminosity accumulated by the CDF II detector at the Fermilab Tevatron. The event signature we consider is $W\to \ellν$ and $π_{T} \to b\bar{b}, b\bar{c}$ or $b\bar{u}$ depending on the $π_{T}$ charge. We select events with a single high-$p_T$ electron or muon, large missing transverse energy, and two jets. Jets corresponding to bottom quarks are identified with multiple $b$-tagging algorithms. The observed number of events and the invariant mass distributions are consistent with the standard model background expectations, and we exclude a region at 95% confidence level in the $ρ_T$-$π_T$ mass plane. As a result, a large fraction of the region $m(ρ_T) = 180$ - $250 \mathrm{GeV}/c^2$ and $m(π_T) = 95$ - $145 \mathrm{GeV}/c^2$ is excluded.

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