In 2010 there were press reports that CERN had identified unusual properties in particle behavour in collisions. One link here.
Here is a partial quote:
"In some sense, it's like the particles talk to each other and they decide which way to go," explained CMS Spokesperson Guido Tonelli.
"There should be a dynamic mechanism there somehow giving them a preferred direction, which is not down to the trivial explanation of momentum and energy conservation. It is something which is so far not fully understood,"
I have been unable to find any scientific papers on this however. So has anyone read a scientific paper on this topic and able to enlighten?