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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 datawere taken at a proton--proton centre-of-mass energy of $\sqrt{s}=$ 8 TeV andcorrespond to an integrated luminosity of about 20.2 fb$^{-1}$. Exploiting thetemplate method, and using the distribution of invariant masses oflepton--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.

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