## The mass of the $\pi^-$

M. Daum, D. Gotta

SciPost Phys. Proc. 5, 010 (2021) · published 6 September 2021

### Proceedings event

Review of Particle Physics at PSI

### Abstract

The most precise values of the mass of the negatively charged pion have been determined from several measurements of X-ray wavelengths for transitions in pionic atoms at PSI. The Particle Data Group gives the average $m_{\pi^-}= (139.570 61 \pm 0.000 24) MeV/c^2$.

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