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Ditauonium spectroscopy
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abstract
We examine the properties of ditauonium, an exotic atom consisting of a pair of opposite-sign $\tau$ leptons bound together by the quantum electrodynamics (QED) interaction in a hydrogen-like state. The energy levels, decay modes and associated partial widths, as well as total widths and lifetimes of the ortho- and para-ditauonium states are calculated. Higher-order QED effects -- including Lamb shifts, hyperfine splitting structure, and partial decay widths corrections -- are incorporated up to approximately next-to-next-to-leading-order (NNLO) accuracy. Beyond the dominant diphoton and difermion decays, the rates of rare decay channels -- including Dalitz, radiative, triple-photon, double-Dalitz, four-fermion, and neutrinos final states -- are determined.
Forward citations
Cited by 3 Pith papers
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Production of leptonium in heavy quarkonium decays
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