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Type: Journal article
Title: Simultaneous measurements of the tt¯, W+W-, and Z/γ* →ττ production cross-sections in pp collisions at √s =7 TeV with the ATLAS detector
Other Titles: Simultaneous measurements of the tt -bar, W+W-, and Z/gamma* -> tau tau production cross-sections in pp collisions at root s =7 TeV with the ATLAS detector
Author: Aad, G.
Abbott, B.
Abdallah, J.
Abdel Khalek, S.
Abdinov, O.
Aben, R.
Abi, B.
Abolins, M.
Abouzeid, O.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
Agatonovic-Jovin, T.
et al.
Citation: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 91(5):052005-1-052005-34
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-7998
Statement of
G. Aad … P. Jackson … L. Lee … A. Petridis … N. Soni ... M. White ... et al. (The ATLAS Collaboration)
Abstract: Simultaneous measurements of the tt¯, W+W−, and Z/γ∗→ττ production cross-sections using an integrated luminosity of 4.6  fb−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 tt¯ and Z/γ∗→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(tt¯)=181.2±2.8+9.7−9.5±3.3±3.3  pb, σ(W+W−)=53.3±2.7+7.3−8.0±1.0±0.5  pb, and σ(Z/γ∗→ττ)=1174±24+72−87±21±9  pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W+W− measurement includes the small contribution from Higgs boson decays, H→W+W−.
Rights: © 2015 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published articles title, journal citation, and DOI.
RMID: 0030026868
DOI: 10.1103/PhysRevD.91.052005
Appears in Collections:Physics publications

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