CMS Directly Observes 5-Sigma Diffusion Wake in Quark-Gluon Plasma at 5.02 TeV
Updated
Updated · spacedaily.com · Jul 18
CMS Directly Observes 5-Sigma Diffusion Wake in Quark-Gluon Plasma at 5.02 TeV
2 articles · Updated · spacedaily.com · Jul 18
Summary
More than 5 standard deviations separated CMS’s signal from a no-wake baseline in the 0%-30% most central lead-lead collisions, marking the first direct observation of a diffusion wake in dijet events.
CMS inferred the wake statistically—not from a visible track—by comparing large- and small-pseudorapidity-gap jet pairs and finding a deficit of 1-2 GeV charged particles opposite the propagating jet.
The analysis used 2018 lead-lead data against 2017 proton-proton reference collisions at 5.02 TeV per nucleon pair, with jets selected above 130 GeV and 50 GeV.
The depletion weakened in more peripheral collisions and at 2-4 GeV, matching expectations that less plasma or harder particles would mute the medium’s response.
Models with jet-medium interactions reproduced the wake’s shape but generally overpredicted its size, leaving CMS with a new constraint on how quark-gluon plasma transports deposited energy and momentum.
After a 20-year hunt, a 'wake' was found in subatomic plasma. How does this ghostly ripple reshape our understanding of matter itself?
If scientists can recreate the universe's first moments, what cosmic secrets could this primordial 'soup' finally reveal about our origins?
First Direct Observation of Quark-Gluon Plasma Wake at CERN: Unveiling the Fluid Nature of the Early Universe
Overview
In July 2026, scientists at CERN's Large Hadron Collider achieved a major breakthrough by directly observing a 'wake' created by a fast-moving quark as it traveled through the quark-gluon plasma (QGP). This discovery provided the first experimental validation of a phenomenon predicted over twenty years ago, confirming that the QGP—an extreme state of matter that existed just after the Big Bang—responds collectively to energetic quarks. Understanding these wakes helps researchers unravel the properties of the QGP, offering new insights into the early universe and the fundamental forces that shaped it.