The Large Hadron Collider’s subatomic discoveries didn’t stop with the Higgs boson: This week, scientists at Europe’s CERN research center announced that the collider’s LHCb experiment has detected a doubly charmed particle that’s like a proton, but four times as weighty. The particle is known as the Ξcc⁺, or “Xi-cc-plus.” It flashes in and out of existence in less than the blink of an eye, but just knowing that it exists — and knowing how massive it is — could give physicists a more solid sense of how matter is put together. The discovery of the Xi-cc-plus baryon marks a milestone for the LHCb team. “This is the first new particle identified after the upgrades to the LHCb detector that were completed in 2023,” Vincenzo Vagnoni, the spokesperson for the experiment, said in a news release. It also resolves a 20-year-old mystery.…