The Higgs boson is the biggest find of the century in particle physics, but for the past few weeks, physicists at the Large Hadron Collider have been considering whether there’s a mystery that’s even bigger. Or at least more massive.
The potential mystery has to do with a pattern of particle decay that results in the emission of two photons. The readings collected so far by the teams using the ATLAS and CMS detectors point to a slight “bump” in the expected pattern.
That may hint at the existence of a previously undetected particle with a mass of about 750 billion electron volts – six times heavier than the Higgs, French physicist Adam Falkowski (a.k.a. Jester) writes in his Resonaances blog.
Could it be a second Higgs boson? Evidence for gravitons or extra dimensions? Ever since the findings were made public three weeks ago, theories have been flying around like speeding muons, and with good reason. “If the diphoton excess is really a new particle, we are basically guaranteed to find other phenomena beyond the Standard Model,” Falkowski says.
However, the two-photon excess may be merely a coincidence – the sort of pattern that pops up in an early stage of data collection, but fades away when more readings are factored into the findings.