Measurement of the $W \to \ell\nu$ and $Z/\gamma^* \to \ell\ell$ Production Cross Sections in Proton-Proton Collisions at $\sqrt{s} = 7$ TeV with the ATLAS Detector

Aad, G.

doi:10.1007/JHEP12(2010)060

Measurement of the $$W \to \ell\nu$$ and $$Z/\gamma^* \to \ell\ell$$ Production Cross Sections in Proton-Proton Collisions at $$\sqrt{s} = 7$$ TeV with the ATLAS Detector

Journal Article · Fri Oct 01 04:00:00 EDT 2010 · JHEP

DOI:https://doi.org/10.1007/JHEP12(2010)060· OSTI ID:1847835

Aad, G.

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: ATLAS

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1847835

Report Number(s):: CERN-PH-EP-2010-037; FERMILAB-PUB-10-712-E; arXiv:1010.2130; oai:inspirehep.net:872570

Journal Information:: JHEP, Journal Name: JHEP Vol. 12

Country of Publication:: United States

Language:: English

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