Prospects for ditauonium discovery at colliders
Abstract
The feasibility of observing ditauonium, the bound state of two tau leptons, at e+e- colliders (BES III at √{ s } = 3.78 GeV, Belle II at √{ s } = 10.6 GeV, a future super tau-charm factory (STCF) at √{ s } ≈ 2mτ, and the FCC-ee at √{ s } = 91.2 GeV) as well as in hadronic and photon-photon collisions at the LHC, is studied. Cross sections and expected yields for spin-0 para- (T0) and spin-1 ortho- (T1) ditauonium are presented for nine different production and decay processes. Para-ditauonium can be observed at the FCC-ee via photon fusion in its diphoton decay (γγ →T0 → γγ). Ortho-ditauonium can be observed at STCF via e+e- →T1 →μ+μ-, where a threshold scan with monochromatized beams can also provide a very precise extraction of the tau lepton mass with O (25 keV) uncertainty. Observing pp →T1 (μ+μ-) + X at the LHC is possible by identifying its displaced vertex with a good control of the combinatorial dimuon background. In addition, we compute the rare decay branching fractions of ditauonium into quarkonium plus a photon.
- Publication:
-
Physics Letters B
- Pub Date:
- July 2023
- DOI:
- 10.1016/j.physletb.2023.137960
- arXiv:
- arXiv:2302.07365
- Bibcode:
- 2023PhLB..84237960D
- Keywords:
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- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment;
- Nuclear Experiment;
- Nuclear Theory
- E-Print:
- 15 pages, 6 figures. Minor mods. to match published version: Phys. Lett. B 842 (2023) 137960