Search for a Fourth Generation Top-Like Quark with Single Charged Lepton Final States in 7 TeV pp Collisions*

The CMS Experiment at the LHC recorded 7 TeV center of mass energy pp collisions in the 2011 run. One search conducted in this data was for a fourth generation top-like quark decaying as: t' $\to $ W b. A fourth generation is disfavored by a 125 GeV Standard Model Higgs boson, which is consistent with the observation of a new Higgs-like boson at 125 GeV at the LHC. However, extended Higgs theories allow t' quarks and there are other models with non-chiral top-like quarks that have similar decay signatures used in this search. This analysis searches for strong top-like quark production which decay into Wb, where one of the W bosons decays leptonically (W$\to $l$\nu )$, the other hadronically (W$\to $q qbar). This analysis studies two channels: $\mu +$jets and electron$+$jets. Results from a sample of 4.9 fb$^{-1} \mu +$jets and 5.0 fb$^{-1}$ electrons$+$jets will be presented.