====== TTP99-05 m alpha^7 ln(alpha)^2 corrections to positronium energy levels ======
 
 
   <hidden 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. 
 </hidden>
|**K. Melnikov and A. Yelkhovsky**  | 
|**  Phys. Lett.  B458 143-151 1999  **  |
| {{preprints:1999:ttp99-05.pdf|PDF}} {{preprints:1999:ttp99-05.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9902276|arXiv]]   |
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