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

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

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ATLAS Collaboration; González de la Hoz, Santiago; Castillo Giménez, María Victoria; Higón Rodríguez, Emilio; Ferrer Soria, Antonio; Hernández Jiménez, Yesenia; García García, Carmen; Martí García, Salvador; Fuster Verdú, Juan A.; Valls Ferrer, Juan Antonio; Salt Cairols, José; Lacasta Llácer, Carlos; Villaplana Pérez, Miguel

Aquest document és un/a article, creat/da en: 2010

Este documento está disponible también en : 10.1007/JHEP12(2010)060

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... [Llegir més ...]

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