Read article 'Protons probe quark–gluon plasma at CMS'
Proton–nucleus collisions provide a crucial tool to investigate the quark–gluon plasma (QGP), a state of nuclear matter with a high energy density spread over a relatively large volume. Although p...
Read article 'LHCb searches for strong CP violation'
CP violation, which relates to an asymmetry between matter and antimatter, is a well-established feature of the weak interaction that mediates decays of strange, charm and beauty particles. It arises ...
Read article 'ALICE prepares for high-luminosity LHC'
The LHC is preparing for a major high-luminosity upgrade (HL-LHC) with the objective to increase the instantaneous luminosity to around 2 × 1035 cm–2 s–1 for proton–proton (pp) collisio...
Read article 'ALICE explores shear viscosity in QCD matter'
One of the key goals in exploring the properties of QCD matter is to pin down the temperature dependence of the shear-viscosity to entropy-density ratio (η/s). In the limit of a weakly interactin...
Read article 'Proton-radius puzzle deepens'
The international CREMA (Charge Radius Experiment with Muonic Atoms) collaboration has measured the radius of the deuteron more accurately than ever before, finding that it is significantly smaller th...
Read article 'DIRAC experiment observes new exotic atom'
Inclusive πK production via the interaction p + Ni → π−K+ + X. The ionisation or break up of AKπ leads to so-called atomic pairs. Image credit: arXiv:1605.06103v1. 
The DIRAC (DIm...
Read article 'ALICE pinpoints J/ψ regeneration'
The ALICE Collaboration has measured with improved precision the production of J/ψ mesons in collisions of lead nuclei at the highest LHC energy, confirming the role of the “regeneration mechanismâ...
Read article 'CMS observes collective phenomena in pp collisions'
When heavy nuclei collide at high energies, a novel state of hot and dense matter – the quark–gluon plasma (QGP) – is expected to form. As a region of QGP expands and cools, it disso...
Read article 'ALICE measures higher-flow harmonics'
In a collision between two nuclei that exhibits a large impact parameter, the initial spatial anisotropy of the overlap region was conjectured to be smooth and almond shaped. In the past few years, ho...
Read article 'ALICE separates hot and cold nuclear effects'
In the early stages of a high-energy collision, high-pT partons can be created, before producing sprays of hadrons that are measured experimentally as jets. Not only do high-pT partons carry informati...
