What the electron’s near-perfect roundness means for new physics
The particle’s most precise measurement yet suggests the LHC isn’t large enough

ROLY-POLY An electron (illustrated) orbits an atom’s nucleus, with a cloud of other hypothetical subatomic particles that could squash the electron’s shape. But so far, measurements show that the electron seems to be almost perfectly round, providing no hint of yet-to-be-found particles.
Nicolle Rager Fuller, NSF