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 2.3fbâ1. An exotic T quark production mode through the decay of a heavy Zâ² 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 Zâ² boson production cross section and branching fraction, with the Zâ² boson decaying to the Tt final state, are set between 0.31 and 0.13 pb, for Zâ² 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.[Figure not available: see fulltext.].
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 âs=13 TeV
Albergo, S.;Costa, S.;Di Mattia, A.;Giordano, F.;Potenza, R.;Tricomi, A.;Tuve, C.;
2017-01-01
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 2.3fbâ1. An exotic T quark production mode through the decay of a heavy Zâ² 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 Zâ² boson production cross section and branching fraction, with the Zâ² boson decaying to the Tt final state, are set between 0.31 and 0.13 pb, for Zâ² 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.[Figure not available: see fulltext.].File | Dimensione | Formato | |
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Search for single production of vector-like quarks.pdf
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