Corrections of order (Zα)^6 m^2_e/m_μin the muonium fine structure, induced by three photon exchange diagrams
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In the framework of the quasipotential method we calculate the contributions of the kind α^6\lnα, alpha^6 of three-photon exchange diagrams to the energy spectrum of muonium $n^3S_1$ state in the leading order on $m_e/m_μ$. Analytical expression of obtained correction for arbitrary principal quantum number is equal to (Zα)^6(m_e/m_μ)m_e(6\ln(2)-35/48)/n^3.
10 pages, LaTEX
10 pages, LaTEX