Agh, my poor brain
OK, so they generated a particle that didn't exist and detected it before it was generated?
Ouch. Even Doctor Who would have trouble beating that.
There is a very controversial theory that antimatter is simply normal matter moving back in time, ie the "Arrow of Time" is reversed. If so then a lot of physics becomes a lot simpler, time paradoxes are avoided and causality simply becomes an observer driven event ie we "see" a glass break because our minds cannot handle the reverse and discard it as garbage data.
Also this means that quasars etc are simply eruptions of antimatter (ie negative time) neatly explaining the anomalous energy production and radiation emission.