[M.D. Holloway]

The new structure, currently dubbed Y(4140), was discovered in experimental data at Fermilab and the Large Hadron Collider (LHC). "We don't know what it is," said Kai Yi, physicist at the University of Iowa and one of the panelists. It could be some sort of exotic new combination of quarks, though not the so-called charmonium that involves charm quarks, or something else entirely. [Beyond Higgs: 5 Elusive Particles That Await Discovery]

Atom Smashers Find Something Not So Charm-ing