Search for pair-produced heavy fourth-generation bottom-like quarks decaying to bZ and tW in 8,TeV proton-proton collisions with multilepton final states

We present a search for anomalous production of events with three or more isolated leptons produced in proton-proton collisions at 8 TeV collected by the CMS experiment at the LHC. We analyze 9.2 /fb of data collected by the CMS experiment during the 2012 LHC run. We categorize observed multilepton events into exclusive search channels based on various quantities based on the identity and kinematics of the objects in the events. The search channels are ordered by the amount of expected Standard Model background. Explicit use of requirements such as missing transverse energy or total hadronic energy is avoided. We emphasize data-based estimation of the Standard Model backgrounds, but also use simulation to estimate some of the backgrounds when appropriate. We interpret search results in the context of a model involving the exotic bottom-like quark bprime decaying to two different modes bZ and tW with varying branching ratios. We derive exclusion limits as a function of the bprime mass as well as the branching ratios.