TY - JOUR TI - Search for vector-like quark pair production with multilepton final states using 19.5 fb^-1 of pp collisions at √s=8 TeV DO - https://doi.org/doi:10.7282/T3CV4KFH PY - 2015 AB - A search for pair-production of vector-like partners of the b quark, b', using 19.5 fb^-1 of integrated luminosity in pp collisions at √s=8 TeV collected by the CMS experiment at the LHC, is carried out in events with at least three leptons. Observed multilepton events are categorized into exclusive channels according to the amount of expected Standard Model background in order to increase the search sensitivity. The observations are consistent with Standard Model predictions. The search is interpreted in the context of a vector-like b' quark for different b' masses and for varying branching fractions to the bZ, tW, and bH final states. b' quarks with masses less than values in the range of 520-785 GeV, depending on the values of the branching fraction, are excluded at the 95% confidence level. KW - Physics and Astronomy KW - Quarks KW - Particles (Nuclear physics) LA - eng ER -