For more than two decades, scientists at CERN knew something strange was lurking inside one of the world's most powerful particle accelerators. They couldn't see it, but they could see the damage it caused. The mystery was finally solved in 2024.
A team of physicists has mapped an invisible "ghost" resonance inside CERN's Super Proton Synchrotron (SPS) — a giant particle accelerator that has been operating since the 1970s.
