Order α^4 R_{\infty} corrections to positronium P levels

Khriplovich, I. B.; Milstein, A. I.; Yelkhovsky, A. S.

Order α^4 R_{\infty} corrections to positronium P levels

Authors

Khriplovich, I. B.

Milstein, A. I.

Yelkhovsky, A. S.

Description

The order $α^4 R_{\infty}$ corrections to positronium $P$ levels are found. The calculation is reduced to the ordinary perturbation theory for the nonrelativistic Schrödinger equation. The perturbation operators have the Breit-type structure and are obtained by calculating on-mass-shell diagrams. Found energy corrections constitute numerically $δE(2 ^1 P_1)=0.06$ MHz, $δE(2 ^3 P_2)=0.08$ MHz, $δE(2 ^3 P_1)=0.025$ MHz, $δE(2 ^3 P_2)=-0.58$ MHz.
LaTeX, 15 pages, BudkerINP-93-80