Measurement of the top quark mass in the tt dilepton channel from √s=8 TeV ATLAS data

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the top quark mass in the tt dilepton channel from √s=8 TeV ATLAS data. Physics letters. B, 761, pp. 350-371. Elsevier 10.1016/j.physletb.2016.08.042

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The top quark mass is measured in the tt → dilepton channel (lepton =e,μ ) using ATLAS data recorded in the year 2012 at the LHC. The data were taken at a proton--proton centre-of-mass energy of √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 mtop = 172.99 ± 0.41 (stat) ± 0.74 (syst) GeV, with a total uncertainty of 0.84 GeV. Finally, a combination with previous ATLAS mtop measurements from √s= 7 TeV data in the tt → dilepton and tt → lepton+jets channels results in mtop = 172.84 ± 0.34 (stat) ± 0.61 (syst) GeV, with a total uncertainty of 0.70 GeV.

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