Atoms are normally made of a nucleus and electrons. But scientists are proposing a hunt for a new variety of atom without either. Tauonium (sometimes called “ditauonium” or “true tauonium”) would consist of a negatively charged tau lepton, and its positively charged antimatter counterpart, an antitau.
Tau leptons are relatives of electrons. Each tau has about 3,500 times an electron’s mass, making it heavier than a proton. In the 1950s, scientists discovered an atom called positronium, consisting of an electron and its positively charged antiparticle, a positron. Tauonium, if discovered, would be a burlier atom.
