# Measurement of the top quark mass in the $t\bar{t}\to$ dilepton channel from $\sqrt{s}=8$ TeV ATLAS data

Abstract : The top quark mass is measured in the $t\bar{t}\to$ dilepton channel (lepton $= e, \mu$) using ATLAS data recorded in the year 2012 at the LHC. The data were taken at a proton--proton centre-of-mass energy of $\sqrt{s}=$ 8 TeV and correspond to an integrated luminosity of about 20.2 fb$^{-1}$. Exploiting the template method, and using the distribution of invariant masses of lepton--b-jet pairs, the top quark mass is measured to be $m_{top} =$ 172.99 $\pm$ 0.41 (stat) $\pm$ 0.74 (syst) GeV, with a total uncertainty of 0.84 GeV. Finally, a combination with previous ATLAS $m_{top}$ measurements from $\sqrt{s}=$7 TeV data in the $t\bar{t}\to$ dilepton and $t\bar{t}\to$ lepton+jets channels results in $m_{top} =$ 172.84 $\pm$ 0.34 (stat) $\pm$ 0.61 (syst) GeV, with a total uncertainty of 0.70 GeV.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01328567
Contributor : Claudine Bombar <>
Submitted on : Wednesday, June 8, 2016 - 11:13:09 AM
Last modification on : Thursday, February 7, 2019 - 3:20:18 PM

### Citation

M. Aaboud, Z. Barnovska, N. Berger, L. Di Ciaccio, S. Elles, et al.. Measurement of the top quark mass in the $t\bar{t}\to$ dilepton channel from $\sqrt{s}=8$ TeV ATLAS data. Physics Letters B, Elsevier, 2016, 761, pp.350-371. ⟨10.1016/j.physletb.2016.08.042⟩. ⟨in2p3-01328567⟩

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