New Determination of the Electron’s Mass

A new independent value for the electron’s mass in units of the atomic mass unit is presented, $m_e=0.000\mathrm{}5485799092\left(4\right)\mathrm{u}$. The value is obtained from our recent measurement of the $g$ factor of the electron in ${}^{12}{\mathrm{C}}^{5+}$ in combination with the most recent quantum electrodynamical (QED) predictions. In the QED corrections, terms of order ${\alpha }^2$ were included by a perturbation expansion in $Z\alpha$. Our total precision is three times better than that of the accepted value for the electron’s mass.