Measurement of the top quark mass in the $t\bar{t}\to \mathrm{lepton}+\mathrm{jets}$ and $t\bar{t}\to \mathrm{dilepton}$ channels using $\sqrt{s}=7$ TeV ATLAS data

Abstract

The top quark mass was measured in the channels $t\bar{t}\to \mathrm{lepton}+\mathrm{jets}$ and $t\bar{t}\to \mathrm{dilepton}$ (lepton=$e,\mu$) based on ATLAS data recorded in 2011. The data were taken at the LHC with a proton--proton centre-of-mass energy of $\sqrt{s}=7$ TeV and correspond to an integrated luminosity of 4.6fb${}^{-1}$. The $t\bar{t}\to \mathrm{lepton}+\mathrm{jets}$ analysis uses a three-dimensional template technique which determines the top quark mass together with a global jet energy scale factor (JSF), and a relative $b$-to-light-jet energy scale factor (bJSF), where the terms $b$-jets and light-jets refer to jets originating from $b$-quarks and $u,d,c,s$-quarks or gluons, respectively. The analysis of the $t\bar{t}\to \mathrm{dilepton}$ channel exploits a one-dimensional template method using the $m_{\ell b}$ observable, defined as the average invariant mass of the two lepton+$b$-jet pairs in each event. The top quark mass is measured to be $172.33\pm 0.75(\mathrm{stat})\pm 1.02(\mathrm{syst})$ GeV, and $173.79\pm 0.54(\mathrm{stat})\pm 1.30(\mathrm{syst})$ GeV in the $t\bar{t}\to lepton+jets$ and $t\bar{t}\to dilepton$ channels, respectively. The combination of the two results yields $m_{\mathrm{t}op}=172.99\pm 0.48(\mathrm{stat})\pm 0.78(\mathrm{syst})$ GeV, with a total uncertainty of $0.91$ GeV.

35 pages plus author list + cover pages (51 pages total), 6 figures, 4 tables, published on Eur. Phys. J. C (2015) 75:330. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-02/

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