Direct measurement of the mass difference between top and antitop quarks
2011 (English)In: Physical Review D, ISSN 1550-7998, Vol. 84, no 5, 052005- p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:uu:diva-159467DOI: 10.1103/PhysRevD.84.052005ISI: 000294927000003OAI: oai:DiVA.org:uu-159467DiVA: diva2:445539