New York Times
Physicists find new particle with a double dose of charm
The particle has two heavy quarks — both of a type that are called "charm"— and a light one. In the natural world, baryons have at most one heavy quark. It may have been brief, but in particle physics it lived for "an appreciably long time," he said ...
CERN Physicists Find a Particle With a Double Dose of Charm
LHC: Charming Particle Xi-cc++ Discovered at Cern Fits with Standard Model and Opens New Window on the Universe
'New frontier' in physics: Subatomic particle with double dose of 'charm' discovered