Several small, previously uncalculated contributions to the 2s1/2-2p3/2 splitting S₁ in muonic ⁴He are calculated, and previously calculated contributions are verified. The improved theoretical result is 1817.5±0.6+0.4〈r²〉1/2-106.2〈r²〉+1.4〈r²〉3/21527.3-102.6(〈r²〉=2.80) meV, where 〈r²〉 is the mean-square charge radius of ⁴He in fm². Using the most recent value of the rms charge radius we get S₁ₜₕ=1527.1±4.2 meV, in excellent agreement with the experimental result S₁ₑₓₚ=1527.5±0.3 meV.
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Borie et al. (1978) studied this question.
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