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The matter, known as a quark-gluon plasma (or QGP), is predicted to exist when temperatures and densities are so extreme that regular matter cannot exist. Instead, a “perfect liquid” exists for a short time before it cools and condenses into the regular stuff that forms the building blocks of matter. Although physicists have announced the detection of this exotic state of matter before, new results from the Relativistic Heavy Ion Collider (RHIC) at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory, in Upton, New York, appear to show the tiniest droplets of quark-gluon plasma appear, in a specific pattern,...

ATLAS and CMS experiments shed light on Higgs properties 01 Sep 2015 Results of the analyses by individual experiments (coloured) and both experiments together (black), showing the improvement in precision resulting from the combination of results. Geneva/Saint Petersburg, 1st September 2015. Three years after the announcement of the discovery of a new particle, the so-called Higgs boson, the ATLAS and CMS Collaborations present for the first time combined measurements of many of its properties, at the third annual Large Hadron Collider Physics Conference (LHCP 2015). By combining their analyses of the data collected in 2011 and 2012, ATLAS and CMS...

The LHC finds evidence of particle activity beyond the Standard Model This is a pretty big deal. FIONA MACDONALD 28 AUG 2015 An international team of physicists has found hints of leptons - a specific type of subatomic particle - behaving in strange ways not predicted by the Standard Model. They uncovered this while looking at the decay of particles called B mesons into lighter particles, including two types of leptons: the tau lepton and the muon.According to a key Standard Model concept called 'lepton universality', all leptons are treated equally by all fundamental forces, which means that all...

New measurements show that CPT symmetry holds true for light nuclei such as deuterons -- a hydrogen nucleus with an additional neutron -- and antideuterons, as well as for helium-3 nuclei -- two protons plus a neutron -- and antihelium-3 nuclei. Pictured: The ALICE detector on CERN's Large Hadron Collider. A Saba/CERN Days after scientists at CERN’s Baryon-Antibaryon Symmetry Experiment (BASE) measured the mass-to-charge ratio of a proton and its antimatter particle, the antiproton, the ALICE experiment at the European organization reported similar measurements for light nuclei and antinuclei. The measurements, made with unprecedented precision, add to growing scientific...