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preprints:1997:ttp97-07 [2016/03/15 20:39] (current)
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 +====== TTP97-07 Eight-component two-fermion equations ====== 
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 +  
 +<hidden TTP97-07  Eight-component two-fermion equations > An eight-component formalism is proposed for the relativistic two-fermion  
 + problem. In QED, it  
 + extends the applicability of the Dirac equation with hyperfine interaction to 
 + the positronium case. 
 + The use of exact relativistic  
 + two-body kinematics entails a CP-invariant spectrum which is symmetric in  
 + the total cms energy. It  
 + allows the extension of recent $\alpha^6$ recoil corrections to the positronium 
 + case, and  
 + implies new recoil corrections to  
 + the fine and hyperfine structures and to the Bethe logarithm. 
 + </hidden> 
 +|**R. H\"ackl, V. Hund and H. Pilkuhn**  |  
 +|** Phys. Rev. A57 3268 1998  **  | 
 +| {{preprints:1997:ttp97-07.pdf|PDF}} {{preprints:1997:ttp97-07.ps|PostScript}}   | 
 +| |