Search for single production of vector-like quarks decaying to a Z boson and a top or a bottom quark in proton-proton collisions at s√=13 TeV

Open access
Author
CMS Collaboration
Sirunyan, Albert M.
Bachmair, Felix
Bäni, L.
Bianchini, Lorenzo
Casal, Bruno
Dissertori, Günther
Dittmar, Michael
Donega, Mauro
Grab, Christoph
Heidegger, Constantin
Hits, Dmitry
Hoss, Jan
Kasieczka, Gregor
Lustermann, Werner
Mangano, Boris
Marionneau, Matthieu
Martinez Ruiz del Arbol, Pablo
Masciovecchio, Mario
Meinhard, Maren T.
Meister, Daniel
Micheli, Francesco
Musella, Pasquale
Nessi-Tedaldi, Francesca
Pandolfi, Francesco
Pata, Joosep
Pauss, Felicitas
Perrin, Gaël
Perrozzi, Luca
Quittnat, Milena
Rossini, Marco
Schönenberger, Myriam
Starodumov, Andrey
Tavolaro, Vittorio R.
Theofilatos, Konstantinos
Wallny, Rainer
et al.
Date
2017-05Type
- Journal Article
Abstract
A search for single production of vector-like quarks, T and B, decaying into a Z boson and a top or a bottom quark, respectively, is presented. The search is performed using data collected by the CMS experiment at the LHC in proton-proton collisions at s√=13 TeV, corresponding to an integrated luminosity of 2.3fb−1. An exotic T quark production mode through the decay of a heavy Z′ resonance is also considered. The search is performed in events with a Z boson decaying leptonically, accompanied by a bottom or a top quark decaying hadronically. No excess of events is observed over the standard model background expectation. Products of production cross section and branching fraction for T and B quarks from 1.26 and 0.13 pb are excluded at 95% confidence level for the range of resonance mass considered, which is between 0.7 and 1.7 TeV. Limits on the product of the Z′ boson production cross section and branching fraction, with the Z′ boson decaying to the Tt final state, are set between 0.31 and 0.13 pb, for Z′ boson masses in the range from 1.5 to 2.5 TeV. This is the first search at 13 TeV for single production of vector-like quarks in events with a Z boson decaying leptonically accompanied by boosted jets Show more
Permanent link
https://doi.org/10.3929/ethz-b-000191945Publication status
publishedJournal / series
Journal of High Energy PhysicsVolume
Pages
Publisher
SpringerSubject
Beyond Standard Model; vector-like quarks; Hadron-Hadron scattering (experiments)Organisational unit
03593 - Dissertori, Günther08803 - Grab, Christoph (Tit.Prof.)
03904 - Wallny, Rainer
03381 - Pauss, Felicitas (emeritus)
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