Precision Mass Spectroscopy of the Antiproton and Proton Using Simultaneously Trapped Particles

摘要: This last of a series three measurements improves the comparison antiproton $(\overline{p})$ and proton $(p)$ by almost factor ${10}^{6}$ over earlier exotic atom measurements, is most precise $\mathrm{CPT}$ test with baryons similar large factor. Measuring cyclotron frequencies simultaneously trapped $\overline{p}$ ${H}^{\ensuremath{-}}$ ion establishes that ratio $q/m$ for $p$ $\ensuremath{-}0.99999999991\ifmmode\pm\else\textpm\fi{}0.00000000009$, more than 10 times accuracy our previous measurement. $9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ makes first use particles sub-ppb spectroscopy.