tauonit
Tauonit is a hypothetical particle predicted by some extensions to the Standard Model of particle physics. It is often discussed in the context of supersymmetry, where it is a superpartner to the tau lepton. Like the tau lepton, the tauonit is a fermion, meaning it has half-integer spin. Its electric charge is also predicted to be the same as the tau lepton, which is negative. The tauonit would carry a lepton number of +1. However, unlike the tau lepton, the tauonit is expected to be electrically neutral. This neutrality arises from its nature as a superpartner. The exact mass of the tauonit is not predicted by theory and would depend on the specific parameters of the supersymmetric model. Searches for tauonits are conducted at high-energy particle colliders, such as the Large Hadron Collider, looking for indirect evidence of their existence through their decay products or by observing missing energy in collision events. No experimental evidence for the tauonit has been found to date.