Search for pair production of vector-like quarks in the bW$\overline{\mathrm{b}}$W channel from proton-proton collisions at $\sqrt{s} =$ 13 TeV

Bakhshiansohi, Hamed [UCL] Bondu, Olivier [UCL] Brochet, Sébastien [UCL] Bruno, Giacomo [UCL] Caputo, Claudio [UCL] Caudron, Adrien de Visscher, Simon [UCL] Delaere, Christophe [UCL] Delcourt, Martin [UCL] François, Brieuc [UCL] Giammanco, Andrea [UCL] Jafari, Abideh Komm, Matthias [UCL] Krintiras, Georgios [UCL] Lemaitre, Vincent [UCL] Magitteri, Alessio [UCL] Mertens, Alexandre Musich, Marco [UCL] Piotrzkowski, Krzysztof [UCL] Quertenmont, Loic [UCL] Vidal Maroño, Miguel [UCL] Wertz, Sébastien [UCL] CMS et al.[show all]

A search is presented for the production of vector-like quark pairs, T$\overline{\mathrm{T}}$or Y$\overline{\mathrm{Y}}$, with electric charge of 2/3 (T) or -4/3 (Y), in proton-proton collisions at $\sqrt{s} =$ 13 TeV. The data were collected by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.8 fb$^{-1}$. The T and Y quarks are assumed to decay exclusively to a W boson and a b quark. The search is based on events with a single isolated electron or muon, large missing transverse momentum, and at least four jets with large transverse momenta. In the search, a kinematic reconstruction of the final state observables is performed, which would permit a signal to be detected as a narrow mass peak ($\approx$7% resolution). The observed number of events is consistent with the standard model prediction. Assuming strong pair production of the vector-like quarks and a 100% branching fraction to bW, a lower limit of 1295 GeV at 95% confidence level is set on the T and Y quark masses