TTP99-05 m alpha^7 ln(alpha)^2 corrections to positronium energy levels

TTP99-05 m alpha^7 ln(alpha)^2 corrections to positronium energy levels

TTP99-05 m alpha^7 ln(alpha)^2 corrections to positronium energy levels

We present a calculation of the O(m alpha^7 ln(alpha)^2) corrections to positronium energy levels. The result is used to estimate the current uncertainty in theoretical predictions of the positronium spectrum.

K. Melnikov and A. Yelkhovsky
Phys. Lett. B458 143-151 1999
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