Physicists Discover a New Massive Particle at CERN

Physicists at CERN have announced a groundbreaking discovery: a new subatomic particle called the Xi-cc-plus (Ξcc+).

This particle, identified by the LHCb collaboration on March 17, 2026, is a baryon, which is a composite particle made of three quarks.

Specifically, the Xi-cc-plus contains two charm quarks and one down quark.

Because charm quarks are much heavier than the up quarks found in standard protons, this new particle is four times more massive.

Researchers were able to spot the particle using upgraded LHCb detectors, which are significantly more sensitive than the original versions.

Since the particle is highly unstable and decays almost instantly, physicists identified it by analyzing the debris left behind after high-energy proton-proton collisions.

This discovery is a significant win for Quantum Chromodynamics (QCD), the theory explaining the strong nuclear force.