2011 QCD and High Energy Interactions - Rencontres de Moriond ...

Another domain where Tevatron is still leading the way is top physics. The Tevatron experiments
have now in hands samples of several thousand top-antitop pairs and are constantly updating the
investigation of all decay channels to improve the measurements of top properties (figure 8).
Figure 8: Recent CDF top measurement in the hadronic decay channel (left) and compilation of top
mass determination (right).
One intriguing observation is the indication of a forward-backward asymmetry between the 2 tops
of the top pair system, observed by both Tevatron experiments (figure 9) in contrast with the small
asymmetry expected in the SM. There is however no visible deviation from SM in the measured top
pair mass spectrum (figure 10).
Figure 9:
Forward-backward asymmetry measured by D0 (left) and CDF (right) in top pair production.