Proposal for new measurements of muonic helium hyperfine structure at J-PARC
Proposal for new measurements of muonic helium hyperfine structure at J-PARC
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J-PARC 缪子氦超精细结构新测量提案
DOI：
10.1051/epjconf/202226201012
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发表时间：
2022
影响因子：
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通讯作者：
Nishimura Shoichiro
中科院分区：
文献类型：
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作者：
Fukumura Seiso;Strasser Patrick;Ino Takashi;Oku Takayuki;Okudaira Takuya;Kanda Sohtaro;Kitaguchi Masaaki;Shimomura Koichiro;Shimizu Hirohiko M.;Torii Hiroyuki A.;Nishimura Shoichiro
对介子氦基态超精细结构的测量有可能将负介子质量的精度提高50倍或更多。负Muon的质量是非常重要的，因为它使我们能够通过与正Muon质量的比较来检验CPT定理。我们的目标是使用J-PARC上的高强度Muon束测量Muonic氦的超精细结构，其精度比以前的实验[1，2]高1000倍，并在2021年3月的一次测试实验中已经获得了比目前零场测量更高的精度。为了进一步提高精度，我们计划在强磁场中进行测量，并采用一种可以产生高度极化的缪子氦原子的技术[3]。在这篇文章中，我们将报道这些进展。
The measurement of the ground state hyperfine structure of muonic helium has the potential to improve the precision of the mass of the negative muon by a factor of 50 or more. The mass of the negative muon is very important because it enables us to test the CPT theorem by comparison with positive muon mass. We aim to measure the hyperfine structure of muonic helium with a precision 1000 times higher than previous experiments [1,2] using the highintensity muon beam at J-PARC and have already obtained results better than the current precision in zero-field measurements in a test experiment in March 2021. To further improve the precision, we plan to measure in a high magnetic field and incorporate a technique that can produce highly polarized muonic helium atom [3]. In this paper, we will report on these developments.