Author/Authors :
H. Yamaguchi، نويسنده , , J. Eades، نويسنده , , R.S. Hayano، نويسنده , , M. Hori، نويسنده , , D. Horv?th، نويسنده , , T. Ishikawa، نويسنده , , B. Juh?sz، نويسنده , , J. Sakaguchi، نويسنده , , H.A. Torii، نويسنده , , E. Widmann، نويسنده , , T. Yamazaki، نويسنده ,
Abstract :
We have measured twelve transition frequencies of the antiprotonic helium atom (p̄He+) with precisions of 0.1–0.2 ppm using a laser spectroscopic method. The agreement between the experiment and theories was so good that we can put a limit on the proton-antiproton mass (or charge) difference. The new limit is expected to be much smaller than the already published value, 60 ppb (6 × 10−8).
