Speaker
Description
Positronium, as a simple leptonic system, allows to make precise bound-state QED predictions on its properties such as its lifetime. Second order loop corrections to the ortho-Positronium decay rate have been calculated, fixing the lifetime up to the 1ppm level [1]. In comparison to the state-of-the-art measurements [2][3], the theory is two orders of magnitude more precise. As the main limitations so far are of systematic and statistical nature, we propose a new methodology tackling many of the former systematics and obtain the sought for statistics. This would allow to reduce the uncertainty by an order of magnitude and getting in the region of comparing to the state of art calculations. This would also allow to search for new physics such as massless dark photons [4].
[1] G. S. Adkins et al, Annals of Physics 295, 136–193 (2002)
[2] R.S.Vallery et al, Phys. Rev. Lett. 90, 203402 (2003)
[3] O. Jinnouchi et al, Physics Letters B: 572 1172 (2003)
[4] Vigo et al, Physics Review Letters 124, 101803 (2020)
