Progress in precision laser spectroscopy of ${displaystyleoverline{p}}$ -He

摘要

The mass of the antiproton (the antiproton-electron mass ratio $m_{overline{p}}/m_e$ ) can be deduced from laser spectroscopy measurements of antiprotonic helium, compared to 3-body QED calculations. The most precise spectroscopy measurements have so far been limited by Doppler-broadening at finite temperatures. The status of our ongoing precision measurements is presented, within the framework of the Asacusa experiment at CERN.