Pound for pound, of all the particles with mass, neutrinos are the fastest, almost traveling at the speed of light … but not quite. So exactly how fast are they? Neutrino physicist Kirsty Duffy and Durham University neutrino theorist Jessica Turner discuss how fast the elusive neutrinos can travel.
For the first time, physicists extracted the detailed “energy-dependent neutrino-argon interaction cross section,” a key value for studying how neutrinos change their flavor.
The Standard Model allows for the Higgs boson to decay to identically flavored pairs of leptons, such as electrons and muons, but not to mixed pairings of lepton flavors. Evidence of the latter would be a sign of new physics.