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Measurement of the inclusive and fiducial t(t)over-bar productioncross-sections in the lepton plus jets channel in pp collisions at roots=8 TeV with the ATLAS detector
Univ Mohamed Premier, Fac Sci, Oujda, Morocco.;LPTPM, Oujda, Morocco..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-6945-1916
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8015-7512
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Number of Authors: 28882018 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 78, no 6, article id 487Article in journal (Refereed) Published
Abstract [en]

The inclusive and fiducial tt¯ production cross-sections are measured in the lepton+jets channel using 20.2fb-1 of proton–proton collision data at a centre-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC. Major systematic uncertainties due to the modelling of the jet energy scale and b-tagging efficiency are constrained by separating selected events into three disjoint regions. In order to reduce systematic uncertainties in the most important background, the W+\,jets process is modelled using Z+ jets events in a data-driven approach. The inclusive tt¯ cross-section is measured with a precision of 5.7% to be σinc(tt¯)=248.3±0.7(stat.)±13.4(syst.)±4.7(lumi.)pb, assuming a top-quark mass of 172.5 GeV. The result is in agreement with the Standard Model prediction. The cross-section is also measured in a phase space close to that of the selected data. The fiducial cross-section is σfid(tt¯)=48.8±0.1(stat.)±2.0(syst.)±0.9(lumi.)pb with a precision of 4.5%. © 2018, CERN for the benefit of the ATLAS collaboration.

Place, publisher, year, edition, pages
Springer , 2018. Vol. 78, no 6, article id 487
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-232955DOI: 10.1140/epjc/s10052-018-5904-zISI: 000435153700003Scopus ID: 2-s2.0-85048534318OAI: oai:DiVA.org:kth-232955DiVA, id: diva2:1236926
Note

QC 20180806

Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2018-08-10Bibliographically approved

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Kastanas, Konstatinos A.Lund-Jensen, BengtOhm, ChristianRipellino, GiuliaSidebo, P. EdvinStrandberg, Jonas

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