6533b829fe1ef96bd128aa4d

RESEARCH PRODUCT

Measurement of the W‐>lnu and Z/gamma*‐>ll production cross sections in protonproton collisions at √s = 7 TeV with the ATLAS detector

Atlas CollaborationSantiago González De La HozMaría Victoria Castillo GiménezEmilio Higón RodríguezAntonio Ferrer SoriaYesenia Hernández JiménezCarmen García GarcíaSalvador Martí GarcíaJuan A. Fuster VerdúJuan Antonio Valls FerrerJosé Salt CairolsCarlos Lacasta LlácerMiguel Villaplana Pérez

subject

Acceleradors de partículesHigh Energy Physics::ExperimentNuclear ExperimentDetectors de radiacióPartícules (Física nuclear)

description

First measurements of the W -> lnu and Z/gamma* -> ll (l = e, mu) production cross sections in proton-proton collisions at sqrt(s) = 7 TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W -> lnu 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 $\stotW$ * BR(W -> lnu) = 9.96 +- 0.23(stat) +- 0.50(syst) +- 1.10(lumi) nb and $\stotZg$ * 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.

yearjournalcountryeditionlanguage
2010-01-01
10.1007/jhep12(2010)060http://hdl.handle.net/10550/35693