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Direct measurement of the mass difference between top and antitop quarks

Research output: Contribution to journalJournal article

Published
Article number052005
<mark>Journal publication date</mark>14/09/2011
<mark>Journal</mark>Physical Review D
Issue number5
Volume84
Number of pages18
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

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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© 2011 American Physical Society

submitted to Phys. Rev. D