Direct Measurement of the Mass Difference between Top and Antitop Quarks

D0 COLLABORATION, ..., R.PIEGAIA,

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 2009 vol. 103 p. 132001 - 1320011

0031-9007

We present a measurement of the mass difference between t and t̅ quarks in lepton+jets final states of tt̅ events in 1  fb-1 of data collected with the D0 detector from Fermilab Tevatron Collider pp̅ collisions at √s=1.96  TeV. The measured mass difference of 3.8±3.7  GeV is consistent with the equality of t and t̅ masses. This is the first direct measurement of a mass difference between a quark and its antiquark partner.