https://doi.org/10.1140/epjc/s10052-022-10831-x
Regular Article - Theoretical Physics
Ditauonium spectroscopy
1
EP Department, CERN, 1211, Geneva, Switzerland
2
DRII-IPSA, Bis, 63 Boulevard de Brandebourg, 94200, Ivry-sur-Seine, France
3
Laboratoire de Physique Théorique et Hautes Energies (LPTHE), UMR 7589, Sorbonne Université et CNRS, 4 place Jussieu, 75252, Paris Cedex 05, France
Received:
25
April
2022
Accepted:
22
September
2022
Published online:
18
October
2022
We examine the properties of ditauonium, an exotic atom consisting of a pair of opposite-sign 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.
© The Author(s) 2022
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