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 13 TeV - INSPIRE

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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 13 TeV

CMS

Collaboration

2017

18 pages

Report number:

CMS-PAS-B2G-17-007

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

A search for the single production of a vector-like quark, T, decaying into a Z boson and a top quark is presented. The Z boson decays leptonically while the top quark decays hadronically. The search is performed using data collected by the CMS experiment at the LHC in proton-proton collisions at

\sqrt{s}=13

TeV in 2016, corresponding to an integrated luminosity of 35.9 fb

^{-1}

. The presence of jets produced in the forward region of the detector is a particular characteristic of the single production of vector-like quarks and is utilized in the analysis. Limits are set for different hypotheses, from negligible width to a width equal to

30\%

of the resonance mass. An additional production mode is also studied for the T quark, through the decay of a heavy Z

^{\prime}

resonance that decays to Tt. The product of cross section and branching fraction above values in the range 0.27-0.04 pb is excluded at

95\%

confidence level for the range of resonance mass considered, which is between 0.7 and 1.7 TeV in the case of a T quark with negligible width. A similar sensitivity is observed for widths of up to

30\%

of the resonance mass. In the case that the T comes from the decay of a Z

^{\prime}

, limits on the product of cross section and branching fraction are set between 0.13 and 0.06 pb for Z

^{\prime}

boson masses in the range from 1.5 to 2.5 TeV.

Note:

Preliminary results

Data
p p: scattering
p p: colliding beams
quark: postulated particle
quark: vector particle
quark: single production
quark: decay
Z0: associated production
top: associated production
resonance: mass

References(54)

Figures(16)

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