Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass -: art. no. 093401

被引:115
作者
Hori, M [1 ]
Eades, J
Hayano, RS
Ishikawa, T
Sakaguchi, J
Widmann, E
Yamaguchi, H
Torii, HA
Juhász, B
Horváth, D
Yamazaki, T
机构
[1] CERN, CH-1211 Geneva 23, Switzerland
[2] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[3] Univ Tokyo, Inst Phys, Meguro Ku, Tokyo 1538902, Japan
[4] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary
[5] KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
[6] RIKEN, RI Beam Sci Lab, Wako, Saitama 3510198, Japan
关键词
D O I
10.1103/PhysRevLett.87.093401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Six laser-resonant transitions have been detected in metastable antiprotonic helium atoms produced at the CERN Antiproton Decelerator. They include UV transitions from the last metastable states in the v = n - l - 1 = 0 and 1 cascades. Zero-density frequencies were obtained from measured pressure shifts with fractional precisions between 1.3 x 10(-7) and 1.6 x 10(-6). By comparing these with QED calculations and the antiproton cyclotron frequency, we deduce that the antiproton and proton charges and masses agree to within 6 x 10(-8) with a confidence level of 90%.
引用
收藏
页码:934011 / 934014
页数:4
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