International Conference on Precision Physics and Fundamental Physical Constants (FFK-2019)

Calculation of higher order corrections to positronium energy levels

10 Jun 2019, 11:45

30m

Balaton Limnological Research Institute of the Hungarian Academy of Sciences

Session 1: Precision spectroscopy of atoms and ions

Speaker

Gregory Adkins (Franklin & Marshall College)

Description

I report on progress in the calculation of corrections to positronium energy levels of order $m \alpha^7$. Corrections at this level will be needed for the interpretation of the results of upcoming measurements. A procedure for the calculation of high order corrections has been developed based on the Bethe-Salpeter equation of dimensionally regularized NRQED and the method of regions. I demonstrate the effectiveness of this approach by using it to obtain all pure recoil corrections to positronium energies at $O(m \alpha^6)$ in a unified manner.

Presentation materials

FFK2019 Adkins.pdf