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Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2009 Sep 25;103(13):132001. doi: 10.1103/PhysRevLett.103.132001. Epub 2009 Sep 21.
We present a measurement of the mass difference between t and t[over] quarks in lepton + jets final states of tt[over] events in 1 fb;{-1} of data collected with the D0 detector from Fermilab Tevatron Collider pp[over] collisions at sqrt[s] = 1.96 TeV. The measured mass difference of 3.8 +/- 3.7 GeV is consistent with the equality of t and t[over ] masses. This is the first direct measurement of a mass difference between a quark and its antiquark partner.
