Measurement of the top quark mass in the t(t)over-bar -> dilepton channel from root s=8TeVATLAS data

The top quark mass is measured in the t (t) over bar -> 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 root s = 8 TeV and correspond to an integrated luminosity of about 20.2 fb(-1). Explo...

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Bibliographic Details
Published in:Physics letters. B 2016, Vol.761, p.350
Main Authors: Abulaiti, Yiming, Åkerstedt, Henrik, Åsman, Barbro, Bendtz, Katarina, Bertoli, Gabriele, Bessidskaia Bylund, Olga, Bohm, Christian, Clement, Christophe, Cribbs, Wayne A., Hellman, Sten, Jon-And, Kerstin, Lundberg, Olof, Milstead, David A., Moa, Torbjörn, Molander, Simon, Pani, Priscilla, Pöttgen, Ruth, Rossetti, Valerio, Shaikh, Nabila W., Shcherbakova, Anna, Silverstein, Samuel B., Sjölin, Jörgen, Strandberg, Sara, Ughetto, Michaël, Valdes Santurio, Eduardo, Wallängen, Veronica
Format: Article
Language:English
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Summary:The top quark mass is measured in the t (t) over bar -> 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 root 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-jetpairs, the top quark mass is measured to be m(top) = 172.99 +/- 0.41(stat)+/- 0.74(syst) GeV, with a total uncertainty of 0.84 GeV. Finally, acombination with previous ATLAS m(top) measurements from root s = 7 TeV data in the t (t) over bar -> dilepton and t (t) over bar -> lepton + jets channels results in m(top) = 172.84 +/- 0.34(stat)+/- 0.61(syst) GeV, with a total uncertainty of 0.70 GeV.
ISSN:1873-2445
0370-2693
DOI:10.1016/j.physletb.2016.08.042