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Three-photon-annihilation Contributions to Positronium Energies at Order $M \Alpha^7$ by Adkins, Gregory S.; Kim, Minji; Parsons, Christian; Fell, Richard N. is a scholarly article available to read on EtoBox.

What is Three-photon-annihilation Contributions to Positronium Energies at Order $M \Alpha^7$ about?

Positronium spectroscopy (n=1 hyperfine splitting, n=2 fine structure, and the 1S-2S interval) has reached a precision of order 1 MHz. Vigorous ongoing efforts to improve the experimental results motivate the calculation of the positronium energy levels at order $m \alpha^7$. In this work we present the result for a complete class of such contributions--those involving virtual annihilation of positronium to three photons in an intermediate state. We find an energy shift of $2.6216(11) m \alpha^7/(n \pi)^3$ for the spin-triplet S state with principal quantum number n.

Author

Adkins, Gregory S.; Kim, Minji; Parsons, Christian; Fell, Richard N.

Published

2015

Language

EN