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Scientists propose a hunt for tauonium, a hypothetical variety of atom that would consist of a tau lepton and its antimatter counterpart, an antitau, Emily Conover reported in “Tauonium” (SN: 6/29/24, p. 5).
Reader Hal Heaton asked why tauonium would be classified as an atom, considering it wouldn’t have typical atomic features: electrons and a nucleus of protons and neutrons.
Tauonium would be part of a class called exotic atoms, Conover says. These are similar to the standard atoms on the periodic table but with at least one constituent replaced by another particle. For example, an electron can be replaced with a heavier relative, such as a muon. Or a neutron can be replaced with another particle, such as a hyperon, which contains a strange quark.
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