Direct measurement of the mass difference between top and antitop quarks

Details Direct measurement of the mass difference between top and antitop quarks Direct measurement of the mass difference between top and antitop quarks

2011-06-10

arxiv.org/abs/1106.2063v2

Phys.Rev.D84:052005,2011

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.84.052005

We present a direct measurement of the mass difference between top and antitop quarks (dm) in lepton+jets top-antitop final states using the "matrix element" method. The purity of the lepton+jets sample is enhanced for top-antitop events by identifying at least one of the jet as originating from a b quark. The analyzed data correspond to 3.6 fb-1 of proton-antiproton collisions at 1.96 TeV acquired by D0 in Run II of the Fermilab Tevatron Collider. The combination of the e+jets and mu+jets channels yields dm = 0.8 +/- 1.8 (stat) +/- 0.5 (syst) GeV, which is in agreement with the standard model expectation of no mass difference.

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