Positronium S state spectrum: analytic results at O(m alpha6)
Abstract
We present an analytic calculation of the O(m alpha6) recoil and radiative recoil corrections to energy levels of positronium nS states and their hyperfine splitting. A complete analytic formula valid to O(m alpha6) is given for the spectrum of S states. Technical aspects of the calculation are discussed in detail. Theoretical predictions are given for various energy intervals and compared with experimental results.
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