Direct Measurement of the Mass Difference between Top and Antitop Quarks

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

2009

Comments

Published in Physical Review Letters 103, 132001 (2009). Copyright © 2009 The American Physical Society. Used by permission.

Abstract

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