Evolution of collisions and QGP

Extreme density and temperature allow the transition for the ordinary matter to the deconfined phase, in which quarks and gluons are free from their parent hadrons and they can interact with each other. Such conditions can be reached by ultrarelativistic heavy ion collisions. Different phases of evolution of the matter are predicted according to theoretical … Continue reading Evolution of collisions and QGP

Lattice QCD calculations

Due to the asymptotic freedom, the coupling constant of QCD is a diminishing function as the energy scale increases according to the following equation, already stated (*): . Therefore, the high-energy or equivalently the short-distance behavior can be described by a perturbative expansion, but a perturbative approach to the QCD fails at large distances where the begins to … Continue reading Lattice QCD calculations

The QCD phase diagram

A phase diagram aims to describe the behaviour of matter at different conditions depending for example from variables such as pressure and temperature. In the QCD phase diagram the interactions between particles are ruled by the quantum chromodynamics. The QCD phase transition scheme, in fact, is yet under studies and one of the targets of … Continue reading The QCD phase diagram

The Quark-gluon plasma (QGP)

The basic idea about the QGP is that at sufficiently high energy or density of hadronic matter, the quarks and gluons become deconfined. Statistical mechanics applied to QCD gives the theoretical support and basic indications to investigate such new state of matter and the phase change that is predicted to take place. I try to … Continue reading The Quark-gluon plasma (QGP)