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Measurement of the top quark-pair production cross section with ATLAS in pp collisions at root s=7 TeV
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
Univ Michigan, Dept Phys, Ann Arbor.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 3077
2011 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 71, no 3, 1577- p.Article in journal (Refereed) Published
Abstract [en]

A measurement of the production cross-section for top quark pairs (t (t) over bar) in pp collisions at root s = 7 TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon mu) with large missing transverse energy and at least four jets, and dilepton (ee, mu mu or e mu) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb(-1), 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-t (t) over bar Standard Model processes are estimated using data-driven methods and determined to be 12.2 +/- 3.9 events and 2.5 +/- 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM t (t) over bar production. The inclusive top quark pair production cross-section is measured to besigma(t (t) over bar) = 145 +/- 31 (stat.)(-27)(+42) (syst.) pb.The measurement agrees with perturbative QCD calculations.

Place, publisher, year, edition, pages
Springer, 2011. Vol. 71, no 3, 1577- p.
Keyword [en]
HADRONIC COLLISIONS
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-36424DOI: 10.1140/epjc/s10052-011-1577-6ISI: 000291698400004OAI: oai:DiVA.org:kth-36424DiVA: diva2:430756
Note
QC 20110711. Antal författare 3 077.Available from: 2011-07-12 Created: 2011-07-12 Last updated: 2017-12-11Bibliographically approved

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Strandberg, Jonas

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