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Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector

This note describes the first measurement of the W->lnu production cross section and an observation of Z->ll production, where l = e,μ, by the ATLAS experiment. These results are based on 118 W->lnu candidates and 14 Z->ll candidates, produced in sqrt(s) = 7 TeV proton-proton collisions...

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Autor principal: The ATLAS collaboration
Lenguaje:eng
Publicado: 2010
Materias:
Acceso en línea:http://cds.cern.ch/record/1281306
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author The ATLAS collaboration
author_facet The ATLAS collaboration
author_sort The ATLAS collaboration
collection CERN
description This note describes the first measurement of the W->lnu production cross section and an observation of Z->ll production, where l = e,μ, by the ATLAS experiment. These results are based on 118 W->lnu candidates and 14 Z->ll candidates, produced in sqrt(s) = 7 TeV proton-proton collisions at the LHC and correspond to a total integrated luminosity of approximately 17 nb−1. The total inclusive W-boson production cross section times the leptonic branching ratio is measured to be (8.5 ± 1.3(stat) ± 0.7(syst) ± 0.9(lumi)) nb for the W->enu channel and (10.3 ± 1.3(stat) ± 0.8(syst) ± 1.1(lumi)) nb for the W->μnu channel. This constitutes the first W cross-section measurement by ATLAS in proton-proton collisions and the result obtained is in agreement with theoretical calculations based on NNLO QCD. In addition the expected charge asymmetry between the cross sections for W+ and W− production is experimentally confirmed.
id cern-1281306
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2010
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spelling cern-12813062021-04-18T19:36:53Zhttp://cds.cern.ch/record/1281306engThe ATLAS collaborationMeasurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detectorDetectors and Experimental TechniquesThis note describes the first measurement of the W->lnu production cross section and an observation of Z->ll production, where l = e,μ, by the ATLAS experiment. These results are based on 118 W->lnu candidates and 14 Z->ll candidates, produced in sqrt(s) = 7 TeV proton-proton collisions at the LHC and correspond to a total integrated luminosity of approximately 17 nb−1. The total inclusive W-boson production cross section times the leptonic branching ratio is measured to be (8.5 ± 1.3(stat) ± 0.7(syst) ± 0.9(lumi)) nb for the W->enu channel and (10.3 ± 1.3(stat) ± 0.8(syst) ± 1.1(lumi)) nb for the W->μnu channel. This constitutes the first W cross-section measurement by ATLAS in proton-proton collisions and the result obtained is in agreement with theoretical calculations based on NNLO QCD. In addition the expected charge asymmetry between the cross sections for W+ and W− production is experimentally confirmed.ATLAS-CONF-2010-051oai:cds.cern.ch:12813062010-07-28
spellingShingle Detectors and Experimental Techniques
The ATLAS collaboration
Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector
title Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector
title_full Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector
title_fullStr Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector
title_full_unstemmed Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector
title_short Measurement of the W->lnu production cross-section and observation of Z -> ll production in proton-proton collisions at root{s}=7 TeV with the ATLAS detector
title_sort measurement of the w->lnu production cross-section and observation of z -> ll production in proton-proton collisions at root{s}=7 tev with the atlas detector
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1281306
work_keys_str_mv AT theatlascollaboration measurementofthewlnuproductioncrosssectionandobservationofzllproductioninprotonprotoncollisionsatroots7tevwiththeatlasdetector