Precise measurement of positronium hyperfine splitting using the Zeeman effect
Precise measurement of positronium hyperfine splitting using the Zeeman effect
复制标题
利用塞曼效应精确测量正电子超精细分裂
DOI：
10.1007/s10751-011-0455-9
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发表时间：
2011
影响因子：
--
通讯作者：
A.Yamamoto
中科院分区：
文献类型：
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作者：
A.Ishida;Y.Sasaki;G.Akimoto;T.Suehara;T.Namba;S.Asai;T.Kobayashi;H.Saito;M.Yoshida;K.Tanaka;A.Yamamoto
正电子是研究束缚态量子电动力学(QED)的理想系统。正电子的超精细分裂，即Δ超精细分裂，很好地检验了束缚态计算，并探索了超越标准模型的新物理。一种新的量子电动力学计算方法揭示了15ppm(3.9ppm)σ的Δ高频辐射与实验平均值之间的偏差。在之前的所有实验中，可能会有新的物理或共同的系统不确定性。我们描述了一个新的实验，以减少可能的系统不确定性，并将提供一个独立的差异检查。我们现在正在获取数据，到目前为止，已经得到了ΔHFS= 203.395 1±0.002 4(STAT.，12ppm)±0.001 9(sys.，9.5ppm)GHz的当前结果。精度为Ofo(Ppm)的测量预计将在一年内完成。
Positronium is an ideal system for the research of the quantum electrodynamics (QED) in bound state. The hyperfine splitting (HFS) of positronium, ΔHFS, gives a good test of the bound state calculations and probes new physics beyond the Standard Model. A new method of QED calculations has revealed the discrepancy by 15 ppm (3.9σ) of ΔHFSbetween the QED prediction and the experimental average. There would be possibility of new physics or common systematic uncertainties in the previous all experiments. We describe a new experiment to reduce possible systematic uncertainties and will provide an independent check of the discrepancy. We are now taking data and the current result of ΔHFS= 203.395 1 ±0.002 4 (stat., 12 ppm) ±0.001 9 (sys., 9.5 ppm) GHz has been obtained so far. A measurement with a precision ofO(ppm) is expected within a year.