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Direct measurement of the mass difference between top and antitop quarks

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Article number132001
<mark>Journal publication date</mark>21/09/2009
<mark>Journal</mark>Physical Review Letters
Issue number13
Number of pages7
<mark>Original language</mark>English


We present a measurement of the mass difference between t and tbar quarks observed in lepton+jets final states of ttbar events in 1 fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider in ppbar collisions at sqrt(s)=1.96 TeV. The observed mass difference of 3.8+-3.7 GeV is consistent with the equality of t and tbar masses. This is the first direct measurement of a mass difference between a quark and its antiquark partner.

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© 2009 The American Physical Society

submitted to Phys. Rev. Letters