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Journal Articles

Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms

Nishimura, Shoichiro*; Torii, Hiroyuki*; Fukao, Yoshinori*; Ito, Takashi; Iwasaki, Masahiko*; Kanda, Sotaro*; Kawagoe, Kiyotomo*; Kawall, D.*; Kawamura, Naritoshi*; Kurosawa, Noriyuki*; et al.

Physical Review A, 104(2), p.L020801_1 - L020801_6, 2021/08

 Times Cited Count:13 Percentile:83.13(Optics)

Journal Articles

Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model

Yamaguchi, Yasuhiro; Yamanaka, Nodoka*

Physical Review D, 103(1), p.013001_1 - 013001_20, 2021/01

 Times Cited Count:34 Percentile:95.26(Astronomy & Astrophysics)

We evaluate the electric dipole moment (EDM) of charged leptons in the standard model. We first prove that, at the quark-gluon level, it is suppressed due to the GIM mechanism. We then calculate the hadronic long distance contribution generated by vector mesons at one-loop level. The $$|Delta S|$$ = 1 weak hadronic interaction is derived using the factorization, and the strong interaction is modeled by the hidden local symmetry framework. We find that the EDMs of charged leptons obtained from this hadronic mechanism are much larger than the perturbative four-loop level quark-gluon process, by several orders of magnitude.

Journal Articles

Large long-distance contributions to the electric dipole moments of charged leptons in the standard model

Yamaguchi, Yasuhiro; Yamanaka, Nodoka*

Physical Review Letters, 125(24), p.241802_1 - 241802_7, 2020/12

 Times Cited Count:30 Percentile:88.26(Physics, Multidisciplinary)

We reevaluate the electric dipole moment (EDM) of charged leptons in the standard model using hadron effective models. We find unexpectedly large EDM generated by the hadron level long-distance effect, $$d_e = 5.8times 10^{-40}$$, $$d_{mu} = 1.4times 10^{-38}$$, and $$d_{tau}= -7.3times 10^{-38}$$ $$e$$cm, with an error bar of 70%, exceeding the conventionally known four-loop level elementary contribution by several orders of magnitude.

Journal Articles

New precise measurements of muonium hyperfine structure at J-PARC MUSE

Strasser, P.*; Abe, Mitsushi*; Aoki, Masaharu*; Choi, S.*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Katsuhiko*; et al.

EPJ Web of Conferences, 198, p.00003_1 - 00003_8, 2019/01

 Times Cited Count:13 Percentile:99.06(Quantum Science & Technology)

Journal Articles

Influencec of atmospheric disturbances on the lower trophic level ecosystem in the Japan Sea

Onitsuka, Go*; Yanagi, Tetsuo*; Uno, Itsushi*; Kawamura, Hideyuki; Yoon, J.-H.*; Yamanaka, Yasuhiro*

Engan Kaiyo Kenkyu, 50(1), p.45 - 51, 2012/08

A seasonal variation of phytoplankton concentration is remarkable in the surface layer of the Japan Sea, because of a seasonal variation of solar radiation and nutrient. While, it is suggested that atmospheric perturbation such as typhoon effects a lower level ecosystem in the surface layer. An effect of atmospheric perturbation on the lower level ecosystem was estimated by means of an ocean general circulation model and a lower level ecosystem model in this study. Results of numerical experiments suggested that the atmospheric perturbation enhances a primary production in the Japan Sea.

Journal Articles

Neutron diffraction study on anisotropy of strain age hardening in ferritic steel

Suzuki, Tetsuya*; Yamanaka, Keisuke*; Ishino, Mayuko*; Shinohara, Yasuhiro*; Nagai, Kensuke*; Tsuru, Eiji*; Xu, P. G.

Tetsu To Hagane, 98(6), p.262 - 266, 2012/06

Journal Articles

Administration of human chorionic gonadotropin with a controlled-release function to immature rats for application in male infertility therapy

Okabe, Kazuhiko*; Shibata, Yasuhiro*; Mashimo, Toru*; Yuasa, Hisako*; Yamanaka, Hidetoshi*; Asano, Masaharu; Yoshida, Masaru

Drug Development and Industrial Pharmacy, 26(5), p.559 - 562, 2000/05

 Times Cited Count:1 Percentile:5.63(Chemistry, Medicinal)

no abstracts in English

Oral presentation

Effect of synoptic scale meteorological peturbation on primary production in the Japan Sea

Onitsuka, Go*; Yanagi, Tetsuo*; Uno, Itsushi*; Kawamura, Hideyuki; Yoon, J.-H.*; Yamanaka, Yasuhiro*

no journal, , 

It is suggested that seasonal variation of phytoplankton concentration in the surface layer is remarkable in the Japan Sea and it is additionally reported that increase of phytoplankton concentration is found due to synoptic scale meteorological perturbation. In this study, effect of synoptic scale meteorological perturbation and deposition of nitrogen from atmosphere on primary production in the Japan Sea is estimated in numerical experiments. Short period oscillation of primary production due to synoptic scale meteorological perturbation is dominant between April and November in the numerical experiments. It is suggested that the primary production in the Japan Sea is supported by supply of nutrient due to synoptic scale meteorological perturbation by about 5% and that from atmosphere by about 2%, respectively.

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