True muonium

In particle physics, true muonium is a theoretically predicted exotic atom representing a bound state of an muon and an antimuon (μ+μ−). The existence of true muonium is well established theoretically within the Standard Model. Its properties within the Standard Model are determined by quantum electrodynamics, and may be modified by physics beyond the Standard Model.

True muonium is yet to be observed experimentally, though it may have been generated in the collision of electron and positron beams.[1][2] The ortho-state of true muonium (i.e. the state with parallel alignment of the muon and antimuon spins) is expected to be long-lived (with a lifetime of 1.8×10−12 s), and decay predominantly to an e+e− pair, which makes is possible for LHCb experiment at CERN to observe it with the dataset collected by 2025.[3]

See also

References
  1. S.J. Brodsky, R.F. Lebed (2009). "Production of the smallest QED atom: True muonium (μ⁺μ⁻)". Physical Review Letters. 102 (21): 213401. arXiv:0904.2225. Bibcode:2009PhRvL.102u3401B. doi:10.1103/PhysRevLett.102.213401. PMID 19519103.
  2. H. Lamm, R.F. Lebed (2013). "True Muonium (μ⁺μ⁻) on the Light Front: A Toy Model". arXiv:1311.3245 [hep-ph].
  3. X. Cid Vidal, P. Ilten, J. Plews, B. Shuve and Y. Soreq, Discovering True Muonium at LHCb, Phys. Rev. D100(2019) 053003; arXiv:1904.08458.


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