IS — 2S Transition in Muonium

The dominant contribution to the uncertainty of this theoretical result is generated by the uncertainty of the muon-electron mass ratio in (12.4). 

All other contributions to the uncertainty of the theoretical prediction uncertainty of the Rydberg constant, uncertainty of the theoretical expression, etc., are at least an order of magnitude smaller. 

There is a complete agreement between the experimental and theoretical results for the 15 — 25 transition frequency in (12.17) and (12.18), but clearly further improvement of the experimental data is warranted. 

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