Quarkonium

This new particle is so small it makes an atom look enormous.

Two detector upgrades of ALICE, the dedicated heavy-ion physics experiment at the Large Hadron Collider (LHC), have recently been approved for installation during the next long shutdown of the LHC, which will take place from 2026 to 2028. The first one is an upgrade of the innermost three layers of the Inner Tracking System (ITS3), and the second is a new forward calorimeter (FoCal), optimized for photon detection…

Physicists report the first observations of quantum entanglement in quarks, the heaviest known fundamental particles, inside the Large Hadron Collider

Physicists from the LHCb Collaboration at CERN's Large Hadron Collider (LHC) have reported the first observation of the decay of the Bc+ meson into a J/ψ charm-anticharm quark bound state and a pair of pions, π+π0.

The universe began about 14 billion years ago with a single point that contained a vast array of fundamental particles, according to the prevailing theory known as the Big Bang. Under the pressure of extreme heat and energy, the point inflated and then expanded to become the universe as we know it. That expansion continues to this day.

Quark–gluon plasma is an extremely hot and dense state of matter in which the elementary constituents—quarks and gluons—are not confined inside composite particles called hadrons, as they are in the protons and neutrons that make up the nuclei of atoms. Thought to have existed in the early universe, this special phase of matter can be recreated at the Large Hadron Collider (LHC) in collisions between lead nuclei.

The Standard Model of particle physics predicts an asymmetry between matter and antimatter known as charge-parity (CP) violation.

Since its discovery 20 years ago physicists have been fascinated by χc1(3872), which is also known as X(3872), trying to understand if it is a conventional charmonium state composed of two quarks or if it is an exotic particle composed of four quarks.

Hard as he tried, Murray Gell-Mann could never make himself into a legend like his rakish colleague and collaborator, Richard Feynman -- even if he was probably the greater physicist