New Value of M_mu/M_e from Muonium Hyperfine Splitting

Details New Value of M_mu/M_e from Muonium Hyperfine Splitting New Value of M_mu/M_e from Muonium Hyperfine Splitting

2000-10-13

arxiv.org/abs/hep-ph/0010130v2

Phys.Rev.Lett. 86 (2001) 3280-3283

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 1 figure, revtex. v2: minor clarifications; previously calculated higher order recoil term included

Scientific paper

10.1103/PhysRevLett.86.3280

The complete contribution to the muonium hyperfine splitting of relative order alpha^3(m_e/m_mu)ln(alpha) is calculated. The result amounts to 0.013 kHZ, much smaller than suggested by a previous estimate, and leads to a 2-sigma shift of the most precise value for the muon-electron mass ratio, with the error reduced by approximately 30%. Analogous contributions are calculated for the positronium hyperfine splitting: (217/90-17*ln{2}/3)m_e(alpha^7/pi)ln(1/alpha) \approx -0.32 MHz; the remaining theoretical uncertainty should be well below experimental error, leaving discrepancies of 2.5-sigma and 3.5-sigma with the two most precise measurements.

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