NRQED and next-to-leading hyperfine splitting in positronium
Jun, 199723 pages
Published in:
- Phys.Rev.D 56 (1997) 8053-8061
e-Print:
- hep-ph/9706449 [hep-ph]
Report number:
- MCGILL-97-10
Citations per year
Abstract:
We compute the next-to-leading, O(m alpha^5), contribution to the hyperfine splitting in positronium within the framework of NRQED. When applied to the ground state, our calculation reproduces known results, providing a further test of NRQED techniques. Besides providing a very simple method of calculation of the standard result, we also obtain new expressions for excited states of positronium with negligible additional effort. Our calculation requires the complete next-to-leading matching of the lowest-dimension NRQED four-fermi couplings, which we publish here for the first time.- 31.30.Jv
- 31.15.Md
- 12.20.Ds
- 11.10.St
- positronium: energy levels
- positronium: hyperfine structure
- positronium: excited state
- quantum electrodynamics: nonrelativistic
- effective Lagrangian
- Feynman graph: higher-order
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