Kuroda N, Ulmer S, Murtagh D J, Van Gorp S, Nagata Y, Diermaier M, Federmann S, Leali M, Malbrunot C, Mascagna V, Massiczek O, Michishio K, Mizutani T, Mohri A, Nagahama H, Ohtsuka M, Radics B, Sakurai S, Sauerzopf C, Suzuki K, Tajima M, Torii H A, Venturelli L, Wünschek B, Zmeskal J, Zurlo N, Higaki H, Kanai Y, Lodi Rizzini E, Nagashima Y, Matsuda Y, Widmann E, Yamazaki Y
Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan.
Ulmer Initiative Research Unit, RIKEN, Saitama 351-0198, Japan.
Nat Commun. 2014;5:3089. doi: 10.1038/ncomms4089.
Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart-hydrogen--is one of the most precisely investigated and best understood systems in physics research. High-resolution comparisons of both systems provide sensitive tests of CPT symmetry, which is the most fundamental symmetry in the Standard Model of elementary particle physics. Any measured difference would point to CPT violation and thus to new physics. Here we report the development of an antihydrogen source using a cusp trap for in-flight spectroscopy. A total of 80 antihydrogen atoms are unambiguously detected 2.7 m downstream of the production region, where perturbing residual magnetic fields are small. This is a major step towards precision spectroscopy of the ground-state hyperfine splitting of antihydrogen using Rabi-like beam spectroscopy.
反氢是一种与反质子结合的正电子，是最简单的反原子。它的对应物——氢——是物理研究中研究最精确、理解最透彻的系统之一。对这两个系统进行高分辨率比较，能对CPT对称性进行灵敏测试，而CPT对称性是基本粒子物理标准模型中最基本的对称性。任何测量到的差异都将指向CPT对称性破缺，从而指向新物理。在此，我们报告一种利用尖点阱进行飞行中光谱分析的反氢源的研制情况。在产生区域下游2.7米处，共明确检测到80个反氢原子，此处干扰残余磁场较小。这是朝着利用类拉比束光谱对反氢基态超精细分裂进行精确光谱分析迈出的重要一步。
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