TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.5.012
TI  - The $\pi^0$ mass and the first experimental verification of Coulomb de-excitation in pionic hydrogen
PY  - 2021/09/06
UR  - https://www.scipost.org/SciPostPhysProc.5.012
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 5
SP  - 012
A1  - Daum, Manfred
AU  - Kettle, Peter-R.
AB  - The most precise value for the $\pi^0$ mass was obtained from the measurement of the mass difference $m_{\pi^-}-m_{\pi^0} = 4.593\,64(48)$\,MeV/c$^2$ in the charge exchange reaction $\pi^-$p $\rightarrow \pi^0$n at PSI. With the most precise charged pion mass value, $m_{\pi^+} = 139.570\,21(14)$\,MeV/c$^2$ and the validity of the CPT theorem ($m_{\pi^-} = m_{\pi^+}$), a value $m_{\pi^0} = 134.976\,57(50)$\,MeV/c$^2$ is obtained. The measurements also revealed, for the first time, evidence of an unexpectedly large contribution from Coulomb de-excitation states during the pionic atom cascade.
ER  -

@Article{10.21468/SciPostPhysProc.5.012,
	title={{The $\pi^0$ mass and the first experimental verification of Coulomb de-excitation in pionic hydrogen}},
	author={M. Daum and P.-R. Kettle},
	journal={SciPost Phys. Proc.},
	pages={012},
	year={2021},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.5.012},
	url={https://scipost.org/10.21468/SciPostPhysProc.5.012},
}