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Search for singly produced vector-like top partners in multilepton final states with 139 $\mathrm{fb}^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
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Search for singly produced vector-like top partners in multilepton final states with 139 $\mathrm{fb}^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector

Georges Aad, Braden Keim Abbott, Kira Abeling, Nils Julius Abicht, Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Angel Abusleme, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2023
DOI: https://doi.org/10.3204/pubdb-2023-04708

摘要

background benchmark bottom: particle identification branching ratio CERN LHC Coll channel cross section: upper limit coupling constant: upper limit electron: pair production experimental results final state: ((n)jet 3lepton) final state: ((n)jet dilepton) GeV-cms jet: bottom muon: pair production p p: colliding beams p p: scattering quark --> Z0 top quark: coupling quark: decay modes quark: mass: lower limit quark: postulated particle quark: single production quark: vector particle
A search for the single production of a vector-like top partner ($T$) decaying into a $Z$ boson and a top quark is presented, using the full Run 2 dataset corresponding to 139 $\mathrm{fb}^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV, collected in 2015-2018 with the ATLAS detector at the Large Hadron Collider. The targeted final state is characterized by the presence of a pair of electrons or muons with opposite-sign charges which form a $Z$-boson candidate, as well as by the presence of $b$-tagged jets and forward jets. Events with exactly two or at least three leptons are categorized into two independently optimized analysis channels. No significant excess above the background expectation is observed and the results from the two channels are statistically combined to set exclusion limits at 95% confidence level on the masses and couplings of $T$ for different benchmark models and generalized branching ratio scenarios.

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