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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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Lenguaje: | eng |
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2016
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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. |
id | cern-2211022 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2016 |
record_format | invenio |
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 |