Synopsis: A melting pot of protons

Theorists uncover hints of a quark-gluon plasma in high-energy proton collisions at the LHC.
Synopsis figure
Credit: K. Werner et al., Phys. Rev. Lett. (2011)

The quark-gluon plasma—a fluidlike novel state of matter—is one of the most exciting phenomena to emerge out of studies of heavy-ion collisions at relativistic energies. Many basic questions about this state of matter remain unanswered and are the subject of intense experimental and theoretical scrutiny worldwide. For example, can the quark-gluon plasma also be obtained from the collisions of smaller particles, such as protons? If so, at what energies do these collisions need to occur?

In a paper appearing in Physical Review Letters, Klaus Werner at the University of Nantes, France, and collaborators present numerical simulations that suggest that some of the key features in the data on proton-proton collisions at 7 TeV, obtained from recent experiments at CERN’s Large Hadron Collider (LHC), are consistent with the formation of a fluid phase of matter. According to the authors, proton collisions seem to result in a quark-gluon plasma as well, though the volume of the plasma is substantially smaller than that obtained in heavy-ion collisions. Their result is likely to inspire further theoretical investigations into the extreme state of matter that forms at the energies where experimental data is just about beginning to emerge from the LHC. – Abhishek Agarwal


Features

More Features »

Announcements

More Announcements »

Subject Areas

Particles and Fields

Previous Synopsis

Next Synopsis

Quantum Information

A hybrid quantum computer

Read More »

Related Articles

Synopsis: Neutrino Probes of Long-Range Interactions
Particles and Fields

Synopsis: Neutrino Probes of Long-Range Interactions

Researchers place new limits on hypothetical interactions between neutrinos and large electron populations on galactic scales. Read More »

Synopsis: Black Holes Could Reveal New Ultralight Particles
Particles and Fields

Synopsis: Black Holes Could Reveal New Ultralight Particles

Gravitational-wave signals could contain clues to extremely low-mass particles predicted by extensions of the standard model of particle physics. Read More »

Viewpoint: Black Hole Evolution Traced Out with Loop Quantum Gravity
Particles and Fields

Viewpoint: Black Hole Evolution Traced Out with Loop Quantum Gravity

Loop quantum gravity—a theory that extends general relativity by quantizing spacetime—predicts that black holes evolve into white holes. Read More »

More Articles