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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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Lenguaje: | eng |
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2010
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Acceso en línea: | http://cds.cern.ch/record/1281306 |
_version_ | 1780920459387207680 |
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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 |
record_format | invenio |
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 |