en
Scientific article
Open access
English

Search for pair and single production of new heavy quarks that decay to a Z boson and a third-generation quark in pp collisions at √s = 8 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 1411, p. 104-158
Collection
  • Open Access - SCOAP3
Publication date2014
Abstract

A search is presented for the production of new heavy quarks that decay to a Z boson and a third-generation Standard Model quark. In the case of a new charge +2 / 3 quark ( T ), the decay targeted is T → Zt , while the decay targeted for a new charge −1 / 3 quark ( B ) is B → Zb . The search is performed with a dataset corresponding to 20 . 3 fb −1 of pp collisions at √s = 8 TeV recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider. Selected events contain a high transverse momentum Z boson candidate reconstructed from a pair of oppositely charged same-flavor leptons (electrons or muons), and are analyzed in two channels defined by the absence or presence of a third lepton. Hadronic jets, in particular those with properties consistent with the decay of a b -hadron, are also required to be present in selected events. Different requirements are made on the jet activity in the event in order to enhance the sensitivity to either heavy quark pair production mediated by the strong interaction, or single production mediated by the electroweak interaction. No significant excess of events above the Standard Model expectation is observed, and lower limits are derived on the mass of vector-like T and B quarks under various branching ratio hypotheses, as well as upper limits on the magnitude of electroweak coupling parameters.

Keywords
  • Hadron-Hadron Scattering
Citation (ISO format)
ATLAS Collaboration. Search for pair and single production of new heavy quarks that decay to a Z boson and a third-generation quark in pp collisions at √s = 8 TeV with the ATLAS detector. In: The journal of high energy physics, 2014, vol. 1411, p. 104–158. doi: 10.1007/JHEP11(2014)104
Main files (1)
Article (Published version)
Identifiers
ISSN of the journal1029-8479
417views
120downloads

Technical informations

Creation04/27/2015 10:30:52 AM
First validation04/27/2015 10:30:52 AM
Update time03/14/2023 11:13:08 PM
Status update03/14/2023 11:13:08 PM
Last indexation02/12/2024 11:20:38 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack