Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass -: art. no. 093401
Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass -: art. no. 093401
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DOI：
10.1103/physrevlett.87.093401
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发表时间：
2001-08-27
影响因子：
8.6
通讯作者：
Yamazaki, T
中科院分区：
文献类型：
--
作者：
Hori, M;Eades, J;Yamazaki, T
在欧洲核子研究中心反质子减速器产生的亚稳反质子氦原子中检测到六个激光共振跃迁。它们包括v = n - 1 - 1 = 0和1级联中最后亚稳态的紫外跃迁。零密度频率从测量的压力位移中获得，分数精度在1.3 x 10（-7）和1.6 x 10（-6）之间。通过与QED计算和反质子回旋频率的比较，我们推断出反质子和质子的电荷和质量在6 × 10（-8）以内一致，置信度为90%。
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%.