====== LPN14-045 Hyperfine splitting in positronium to O(alpha^7 m_e): one-photon annihilation contribution ======
^  LPN14-045 Hyperfine splitting in positronium to O(alpha^7 m_e): one-photon annihilation contribution  ^
|**M. Baker, P. Marquard, A.A. Penin, J. Piclum, M. Steinhauser**   | 
|** Phys.Rev.Lett. 112 120407 2014  **    |
|[[http://arxiv.org/abs/|arXiv]]  |
| |