LHC tagged posts

The figure shows how a small, elongated drop of quark-gluon plasma is formed when two atomic nuclei hit each other a bit off center. The angular distribution of the emitted particles makes it possible to determine the properties of the quark-gluon plasma, including the viscosity. Credit: State University of New York

Researchers collided lead atoms with extremely high energy in the 27 km long particle accelerator. The primordial soup is a quark-gluon plasma and researchers have measured its liquid properties with great accuracy at the LHC’s top energy. A few billionths of a second after the Big Bang, the universe was made up extremely hot and dense primordial soup of quarks and gluons. By colliding lead nuclei at a record-high 5...

In this event display from the LHCb experiment at CERN’s Large Hadron Collider, proton-proton collisions at the interaction point (far left) result in a shower of leptons and other charged particles. The yellow and green lines are computer-generated reconstructions of the particles’ trajectories through the layers of the LHCb detector. Credit: CERN/LHCb Collaboration

A team of CERN physicists has found leptons being treated in strange ways not predicted by the Standard Model. The discovery could prove to be a significant lead in the search for non-standard phenomena.

This is one of the highest-energy neutrino events from a survey of the northern sky superimposed on a view of the IceCube Lab at the South Pole. Credit: IceCube Collaboration

Researchers using the IceCube Neutrino Observatory have sorted through the billions of subatomic particles that zip through its frozen cubic-kilometer-sized detector each year to gather powerful new evidence in support of 2013 observations confirming the existence of cosmic neutrinos.

It heralds a new form of astronomy using neutrinos, the nearly massless high-energy particles generated in nature’s accelerators: black holes, massive exploding stars and the energetic cores of galaxies...