Fermilab's Tevatron is the world's most powerful operating particle accelerator, and its operators are pushing hard to prove that the launch of the LHC has not made them irrelevant.

From http://www.scientificblogging.com/news_releases/take_lhc_fermi_scores_again_discovering_rare_single_top_quark :

"Previously, top quarks had only been observed when produced by the strong nuclear force. That interaction leads to the production of pairs of top quarks. The production of single top quarks, which involves the weak nuclear force and is harder to identify experimentally, has now been observed, almost 14 years to the day of the top quark discovery in 1995.

"To make the single-top discovery, physicists of the CDF and DZero collaborations spent years combing independently through the results of proton-antiproton collisions recorded by their experiments, respectively. Each team identified several thousand collision events that looked the way experimenters expect single top events to appear. Sophisticated statistical analysis and detailed background modeling showed that a few hundred collision events produced the real thing. On March 4, the two teams submitted their independent results to Physical Review Letters."