Testing the Technicolor Interpretation of the CDF Dijet Excess at the 8-TeV LHC

Abstract

Under the assumption that the dijet excess seen by the CDF Collaboration near 150 Gev in Wjj production is due to the lightest technipion of the low-scale technicolor process $ρ_T \rightarrow W π_T$, we study its observability in LHC detectors for 8 TeV collisions and 20 inverse femtobarns of integrated luminosity. We describe interesting new kinematic tests that can provide independent confirmation of this LSTC hypothesis. We show that cuts similar to those employed by CDF, and recently by ATLAS, cannot confirm the dijet signal. We propose cuts tailored to the LSTC hypothesis and its backgrounds at the LHC that may reveal $ρ_T \rightarrow \ellνjj$. Observation of the isospin-related channel $ρ^{\pm}_T \rightarrow Z π^{\pm}_T \rightarrow \ell^+\ell^- jj$ and of $ρ^{\pm}_T \rightarrow WZ$ in the $\ell^+\ell^-\ell^{pm}ν_\ell$ and $\ell^+\ell^- jj$ modes will be important confirmations of the LSTC interpretation of the CDF signal. The $Zπ_T$ channel is experimentally cleaner than $Wπ_T$ and its rate is known from $Wπ_T$ by phase space. It can be discovered or excluded with the collider data expected by the end of 2012. The $WZ \rightarrow 3\ellν$ channel is cleanest of all and its rate is determined from $Wπ_T$ and the LSTC parameter $\sinχ$. This channel and $WZ \to \ell^+\ell^- jj$ are discussed as a function of $\sinχ$.