Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s = 7 TeV
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Collaboration-2015-Measurement of the t.pdf
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Author(s)
Taylor, Frank E.
Date Issued
April 2015
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Measurement of the Top-Quark Mass in the Fully Hadronic Decay Channel from ATLAS Data at √s = 7 TeV.” Eur. Phys. J. C 75, no. 4 (April 2015). © 2015 CERN for the benefit of the ATLAS Collaboration
Version
Final published version
Abstract
The mass of the top quark is measured in a data set corresponding to 4.6 fb[superscript −1] of proton–proton collisions with centre-of-mass energy √s = 7 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-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 m[subscript t] = 175.1 ± 1.4(stat.) ± 1.2(syst.) GeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-015-3373-1
