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Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at (Formula presented.)
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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2015 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 4Article in journal (Refereed) Published
Abstract [en]

The mass of the top quark is measured in a data set corresponding to 4.6 (Formula presented.) of proton–proton collisions with centre-of-mass energy (Formula presented.) TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top–antitop quark pairs with at least six jets in the final state are selected. The substantial background from multijet production is modelled with data-driven methods that utilise the number of identified $$b$$b-quark jets and the transverse momentum of the sixth leading jet, which have minimal correlation. The top-quark mass is obtained from template fits to the ratio of three-jet to dijet mass. The three-jet mass is calculated from the three jets produced in a top-quark decay. Using these three jets the dijet mass is obtained from the two jets produced in the W boson decay. The top-quark mass obtained from this fit is thus less sensitive to the uncertainty in the energy measurement of the jets. A binned likelihood fit yields a top-quark mass of (Formula presented.).

Place, publisher, year, edition, pages
2015. Vol. 75, no 4
Keyword [en]
ATLAS, Fully hadronic, LHC, Proton–proton collisions, Top quark, Top-quark mass
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-169094DOI: 10.1140/epjc/s10052-015-3373-1ISI: 000355671300001Scopus ID: 2-s2.0-84928745950OAI: oai:DiVA.org:kth-169094DiVA: diva2:819739
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20150611

Available from: 2015-06-11 Created: 2015-06-11 Last updated: 2017-12-04Bibliographically approved

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Strandberg, Jonas

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