Dimuonium (the bound system of two muons, the μ+ μ--atom system) has not been observed yet. In this paper we discuss the electromagnetic production of dimuonium at RHIC and LHC in relativistic heavy ion collisions. The production of parastates is analyzed in the equivalent photon approximation. For the treatment of orthostates, we develop a three-photon formalism. We determine the production rates at RHIC and LHC with an accuracy of a few percent and discuss problems related to the observation of dimuonium.
I. F. Ginzburg et al., "Production of Bound µ+µ- Systems in Relativistic Heavy Ion Collisions," Physical Review C - Nuclear Physics, vol. 58, no. 6, pp. 3565-3573, American Physical Society (APS), Dec 1998.
The definitive version is available at https://doi.org/10.1103/PhysRevC.58.3565
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