LHCb Finds Proton-Like Baryon With Two Charm Quarks
At CERN, the LHCb collaboration announced the discovery of a proton‑like baryon made of two charm quarks and one down quark, about four times the proton’s mass, observed with 7-sigma significance in Run 3 data; it’s the second baryon with two heavy quarks and a key test for quantum chromodynamics, including a shorter lifetime than the up-quark counterpart, and follows upgrades to the LHCb detector completed in 2023.