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New muonium HFS measurements at J-PARC/MUSE

Strasser, P.*; Aoki, Masaharu*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Keiichi*; Ito, Takashi; Iwasaki, Masahiko*; Kadono, Ryosuke*; Kamigaito, Osamu*; Kanda, Sotaro*; Kawall, D.*; Kawamura, Naritoshi*; Koda, Akihiro*; Kojima, Kenji*; Kubo, Kenya*; Matsuda, Yasuyuki*; Matsudate, Takuya*; Mibe, Tsutomu*; Miyake, Yasuhiro*; Mizutani, Takehiro*; Nagamine, Kanetada*; Nishimura, Jun*; Nishiyama, Kusuo*; Ogitsu, Toru*; Okubo, Ryuji*; Saito, Naoto*; Sasaki, Kenichi*; Seo, Shun*; Shimomura, Koichiro*; Sugano, Michinaka*; Tajima, Minori*; Tanaka, Kazuo*; Tanaka, Toya*; Tomono, Dai*; Torii, Hiroyuki*; Torikai, Eiko*; Toyoda, Akihisa*; Ueno, Akira*; Ueno, Yasuhiro*; Yagi, Daisuke*; Yamamoto, Akira*; Yoshida, Mitsuhiro*

At the Muon Science Facility (MUSE) of J-PARC (Japan Proton Accelerator Research Complex), the MuSEUM collaboration is planning new measurements of the ground state hyperfine structure (HFS) of muonium both at zero field and at high magnetic field. The previous measurements were performed both at LAMPF (Los Alamos Meson Physics Facility) with experimental uncertainties mostly dominated by statistical errors. The new high intensity muon beam that will soon be available at MUSE H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation, and the results of a first commissioning test experiment at zero field are presented.

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