Physicist offers leading theory about mysterious Large Hadron Collider excess

In December of last year, scientists at the Large Hadron Collider in Europe announced startling results hinting at the existence of an undiscovered subatomic particle — one with a mass six times heavier than the Higgs boson, the particle that made headlines in 2012. The evidence is still thin, but if more data confirm the finding, it could sharpen humankind’s understanding of the building blocks of the universe.