The top quark mass is measured in the tt̄ → 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 20.2fb-1. Exploiting the template method, and using the distribution of invariant masses of lepton-b-jetpairs, 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 tt̄ → dilepton and tt̄→lepton+jets channels results in mtop=172.84 ±0.34 (stat) ±0.61 (syst) GeV, with a total uncertainty of 0.70 GeV.

Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., et al. (2016). Measurement of the top quark mass in the tt¯ → dilepton channel from √s = 8 TeV ATLAS data. PHYSICS LETTERS. SECTION B, 761, 350-371 [10.1016/j.physletb.2016.08.042].

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

F. Ceradini;B. Di Micco;R. Di Nardo;D. Orestano;F. Petrucci;D. Puddu;G. Salamanna;