CERN Physicists Discover Four-Charm-Quark Particle, Physics

Physicists from CERN’s LHCb Collaboration have discovered a new tetraquark particle, named X(6900), composed of two charm quarks and two charm antiquarks.

New particle discovered at CERN is a long-lived double charmer

LHCb discovers three new exotic particles: the pentaquark and the first-ever pair of tetraquarks

LHCb discovers three new exotic particles

Fermilab scientists discover new four-flavor particle

Physicists Discover Family of Tetraquarks — Syracuse University News

God particle': TAU researchers further understanding of physics at CERN - The Jerusalem Post

Top Quark Physics Institute of Particle Physics and Accelerator Technologies

How did we fool ourselves into believing in a new particle that wasn't there?, by Ethan Siegel, Starts With A Bang!

Observation of four-charm-quark structure

Standard model, 3.0, Be inspired

Exotic Four-Quark Particle Spotted at Large Hadron Collider

Crisis in Particle Physics Forces a Rethink of What Is 'Natural

Charm quark - Wikipedia

Large Hadron Collider project discovers three new exotic particles

CERN Physicists Discover Four New Tetraquarks