The CMS experiment at CERN has reported the first direct observation of a diffusion wake in quark-gluon plasma using dijet events.

https://spacedaily.com/t-what-filled-the-universe-in-its-first-microseconds-wasnt-gas-dust-or-atoms-it-was-a-trillion-degree-soup-of-quarks-and-gluons-and-the-lhc-has-now-seen-a-single-quark-leave-the-wak/