Search for a Heavy Bottom-like Quark in pp Collisions at sqrt(s) = 7 TeV

A search for pair-produced bottom-like quarks in $\rm pp$ collisions at $\sqrt{s} = 7$~TeV is conducted with the CMS experiment at the LHC. The $\rm b^\prime$ quarks are assumed to decay exclusively to tW. The $\rm b^\prime \overline{b}{}^\prime \to tW^- \overline{t}W^+$ process can be identified by the distinctive signature of trileptons or same-sign dileptons, and at least a b-jet. With a sample corresponding to an integrated luminosity of 1.14~fb$^{-1}$, data is compared to the standard model background predictions and %data is found to be consistent with the standard model background predictions and a $\rm b^\prime$ quark with a mass below 495~GeV/$c^2$ is excluded at the 95\% confidence level.