Simultaneous measurements of the t[bar over t], W[superscript +]W[superscript -], and Z/ γ[superscript *] → ττ production cross-sections in pp collisions at √s = 7 TeV with the ATLAS detector
Name
PhysRevD.91.052005.pdf
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823.73 KB
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Checksum (MD5)
0153d5b8a817dc29be5f424ccc166a79
Author(s)
Taylor, Frank E.
Date Issued
March 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Simultaneous Measurements of the t[bar over t], W[superscript +]W[superscript −], and Z/γ[superscript *] → ττ Production Cross-Sections in pp Collisions at √s = 7 TeV with the ATLAS Detector.” Phys. Rev. D 91, no. 5 (March 2015). © 2015 CERN, for the ATLAS Collaboration
Version
Final published version
Abstract
Simultaneous measurements of the t[bar over t], W[superscript +]W[superscript −], and Z/γ[superscript ∗] → ττ production cross-sections using an integrated luminosity of 4.6 fb[superscript −1] of pp collisions at √s = 7 TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. These results indicate that the correlated next-to-leading-order predictions for t[bar over t] and Z/γ[superscript ∗] → ττ underestimate the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are measured to be σ(t[bar over t]) = 181.2 ± 2.8+9.7 over −9.5]± 3.3 ± 3.3 pb, σ(W[superscript +]W[superscript −]) = 53.3 ± 2.7[+7.3 over −8.0] ± 1.0 ± 0.5 pb, and σ(Z/γ[superscript ∗] → ττ) = 1174 ± 24[+72 over −87] ± 21 ± 9 pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W[superscript +]W[superscript −] measurement includes the small contribution from Higgs boson decays, H → W[superscript +]W[superscript −].
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0 Unported Licence
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.91.052005
