INVESTIGADORES
OTERO Y GARZON Gustavo Javier
artículos
Título:
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
Autor/es:
G. OTERO Y GARZON, R. PIEGAIA, ET. AL., THE ATLAS COLLABORATION
Revista:
EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS
Editorial:
SPRINGER
Referencias:
Año: 2010 p. 65 - 72
ISSN:
1434-6044
Resumen:
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
\stotW * BR(W -> lnu) = 9.96 +- 0.23(stat) +- 0.50(syst) +- 1.10(lumi) nb and \stotZg
\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.