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Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
Univ Savoie, LAPP, CNTS IN2P3, Annecy Le Vieux, France.
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2010 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 12, 1-64 p.Article in journal (Refereed) Published
Abstract [en]

First measurements of the W -> lv and Z/gamma* -> ll (l = e; mu) production cross sections in proton-proton collisions at root s = 7 TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W -> lv and 179 Z/gamma* -> ll candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb(-1). The measured total W and Z/gamma*-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are sigma(tot)(W) center dot BR(W -> lv) = 9.96 +/- 0.23(stat) +/- 0.50(syst) +/- 1.10(lumi) nb and sigma(tot)(Z) center dot BR(Z/gamma* -> ll) = 0.82 +/- 0.06 (stat) +/- 0.05 (syst) +/- 0.09 (lumi) nb (within the invariant mass window 66 < m(ll) < 116 GeV). The W/Z cross-section ratio is measured to be 11.7 +/- 0.9(stat) +/- 0.4(syst). In addition, measurements of the W+ and W- production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.

Place, publisher, year, edition, pages
2010. Vol. 12, 1-64 p.
Keyword [en]
Hadron-Hadron Scattering
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-84535DOI: 10.1007/JHEP12(2010)060ISI: 000208219100001Scopus ID: 2-s2.0-84879587700OAI: oai:DiVA.org:kth-84535DiVA: diva2:499494
Note

QC 20120216

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved

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Strandberg, Jonas

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