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)

Colour confinement

The term confinement indicates that coloured free particles do not exist in Nature. Besides valence quarks, a hadron contains a population of more quarks and gluons. From the (b) side of the Figure in the previous post (*) it is possible to infer that the strong interaction between two quarks enhances with the increasing of their … Continue reading Colour confinement

Ultrarelativistic heavy-ion collision experiments

Why to make particles collide? Okay, if you're on this website you probably do not need to know this and you already have an idea of the physics studied at the and by other particles accelerator experiments. Strongly interacting particles at very high temperatures and energy densities compose a new state of matter called quark-gluon … Continue reading Ultrarelativistic heavy-ion collision experiments

Supersymmetry searches

As discussed before, SUSY theories introduce the existence of particles at the TeV scale, so these could be already accessible at the . The search for these particles and the determination of their properties, such as mass, spin, etc. and their coupling becomes of central importance in order to verify the existence of new Physics … Continue reading Supersymmetry searches

So, what about the Standard Model?

It is now possible to state that the Standard Model is a gauge theory invariant under  symmetry group given by the direct product of the symmetry group of the strong interaction, , with that of electroweak interaction, which also contains the symmetry group of electromagnetic interaction . The general form involving these fields is where: indicate leptons … Continue reading So, what about the Standard Model?

Strong Interactions and quarks

Quantum chromodynamics (QCD) is the gauge theory describing strong interactions between quarks. It constitutes a fundamental theory within the Standard Model and it is responsible for the portion. Weak and electromagnetic interactions are considered unified in the single symmetry group where , the weak hypercharge, is the generator of the group that is given by … Continue reading Strong Interactions and quarks