  The heaviest known elementary particle today, the top quark, has been
discovered in 1995 by the CDF and D0 collaborations at the Tevatron proton
antiproton collider at Fermilab. Recently, the CDF and D0 collaborations have
studied the forward-backward asymmetry in ttbar events, resulting in measured
values larger than the standard model prediction. With the start of the LHC at
CERN in 2010, a new top quark factory has opened and asymmetry measurements in
ttbar have also been performed in a proton proton environment with higher
collision energy. No deviations from the standard model have been noticed so
far in the measurements of ATLAS and CMS. This article discusses recent results
of asymmetry measurements in ttbar events of the ATLAS, CDF, CMS and D0
collaborations.
