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Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states

The production of $t \bar t Z$ serves as an important probe of the coupling of top quarks to Z bosons. Modifications to the $t \bar t Z$ vertex by physics beyond the Standard Model would have an effect on the $t \bar t Z$ production rates. The first measurements of $t \bar t Z$ production were perfo...

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Autor principal: Bessidskaia Bylund, Olga
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.276.0237
http://cds.cern.ch/record/2211022
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author Bessidskaia Bylund, Olga
author_facet Bessidskaia Bylund, Olga
author_sort Bessidskaia Bylund, Olga
collection CERN
description The production of $t \bar t Z$ serves as an important probe of the coupling of top quarks to Z bosons. Modifications to the $t \bar t Z$ vertex by physics beyond the Standard Model would have an effect on the $t \bar t Z$ production rates. The first measurements of $t \bar t Z$ production were performed in 8 TeV data by the ATLAS and CMS experiments at the LHC. At 13 TeV collision energy, the production rate of $t \bar t Z$ increases by almost a factor of 4 and the effects of new physics, if present, should become more prominent. The first measurement by ATLAS of $t \bar t Z$ production at 13 TeV is presented here, with focus on the selection region that requires three charged leptons. This signature constitutes a compromise between a higher branching ratio for hadronic top decay chains and the better separation from background of the leptonic top decays. Moreover, the $t \bar t W$ process is measured, using final states that contain either three charged leptons or two muons of the same charge. The first observation of $t \bar t W$ was performed by ATLAS using 8 TeV data. Measuring this process can probe several different models for physics beyond the Standard Model.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2016
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spelling cern-22110222019-09-30T06:29:59Zdoi:10.22323/1.276.0237http://cds.cern.ch/record/2211022engBessidskaia Bylund, OlgaMeasurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final statesParticle Physics - ExperimentThe production of $t \bar t Z$ serves as an important probe of the coupling of top quarks to Z bosons. Modifications to the $t \bar t Z$ vertex by physics beyond the Standard Model would have an effect on the $t \bar t Z$ production rates. The first measurements of $t \bar t Z$ production were performed in 8 TeV data by the ATLAS and CMS experiments at the LHC. At 13 TeV collision energy, the production rate of $t \bar t Z$ increases by almost a factor of 4 and the effects of new physics, if present, should become more prominent. The first measurement by ATLAS of $t \bar t Z$ production at 13 TeV is presented here, with focus on the selection region that requires three charged leptons. This signature constitutes a compromise between a higher branching ratio for hadronic top decay chains and the better separation from background of the leptonic top decays. Moreover, the $t \bar t W$ process is measured, using final states that contain either three charged leptons or two muons of the same charge. The first observation of $t \bar t W$ was performed by ATLAS using 8 TeV data. Measuring this process can probe several different models for physics beyond the Standard Model.ATL-PHYS-PROC-2016-117oai:cds.cern.ch:22110222016-08-29
spellingShingle Particle Physics - Experiment
Bessidskaia Bylund, Olga
Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states
title Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states
title_full Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states
title_fullStr Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states
title_full_unstemmed Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states
title_short Measurement of ttZ and ttW production at ATLAS in 13 TeV data, using trilepton and same charge dimuon final states
title_sort measurement of ttz and ttw production at atlas in 13 tev data, using trilepton and same charge dimuon final states
topic Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.276.0237
http://cds.cern.ch/record/2211022
work_keys_str_mv AT bessidskaiabylundolga measurementofttzandttwproductionatatlasin13tevdatausingtrileptonandsamechargedimuonfinalstates