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A search for pair production of massive vector-like T and B quarks inproton-proton collisions at sqrt(s) = 13 TeV is presented. The data set wascollected in 2015 by the CMS experiment at the LHC and corresponds to anintegrated luminosity of up to 2.6 inverse femtobarns. The T and B quarks areassumed to decay through three possible channels into a heavy boson (either aW, Z or Higgs boson) and a third generation quark. This search is performed infinal states with one charged lepton and several jets, exploiting techniques toidentify W or Higgs bosons decaying hadronically with large transverse momenta.No excess over the predicted standard model background is observed. Upperlimits at 95% confidence level on the T quark pair production cross section areset that exclude T quark masses below 860 GeV in the singlet, and below 830 GeVin the doublet branching fraction scenario. For other branching fractioncombinations with B(tH) + B(bW) >= 0.4, lower limits on the T quark range from790 to 940 GeV. Limits are also set on pair production of singlet vector-like Bquarks, which can be excluded up to a mass of 730 GeV. These limits are amongthe most stringent to date for vector-like T quarks. The techniques showcasedhere for understanding highly-boosted final states are important as thesensitivity to new particles is extended to higher masses.

the journal of high energy physics/the journal of high energy physics

Search for pair production of vector-like T and B quarks in  single-lepton final states using boosted jet substructure in proton-proton  collisions at sqrt(s) = 13 TeV