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Direct Measurement of the Mass Difference Between Top and Antitop Quarks
Stockholm University, Faculty of Science, Department of Physics.
2011 (English)In: Physical Review D, ISSN 1550-7998, Vol. 84, no 5, 052005- p.Article in journal (Refereed) Published
Abstract [en]

We present a direct measurement of the mass difference between top and antitop quarks (Delta m) in lepton + jets t (t) over bar final states using the "matrix element" method. The purity of the lepton + jets sample is enhanced for t (t) over bar events by identifying at least one of the jets as originating from a b quark. The analyzed data correspond to 3.6 fb(-1) of p (p) over bar collisions at root s = 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 Delta m = 0.8 +/- 1.8(stat) +/- 0.5(syst) GeV, which is in agreement with the standard model expectation of no mass difference.

Place, publisher, year, edition, pages
2011. Vol. 84, no 5, 052005- p.
National Category
Subatomic Physics
Research subject
URN: urn:nbn:se:su:diva-63103DOI: 10.1103/PhysRevD.84.052005ISI: 000294927000003OAI: diva2:446694
Swedish Research Council
Publikationen har totalt 420 författare, V. Abazov et al.Available from: 2011-10-09 Created: 2011-10-09 Last updated: 2012-01-26Bibliographically approved

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