Y. C. Tung

Publications (9)23.24 Total impact

• Source

  Available from: Anatoly Lednev

  Article: Study of the K0(L) --> pi0 pi0 nu nu-bar decay

  Collaboration, R. Ogata, S Suzuki, J K Ahn, Y. Akune, V. Baranov, K.-F. Chen, J. Comfort, M. Doroshenko, Y Fujioka, [......], T Tsukamoto, Y. C. Tung, Y W Wah, H Watanabe, M. L. Wu, M Yamaga, T Yamanaka, H. Y. Yoshida, Y Yoshimura, Y Zheng
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  ABSTRACT: The rare decay K0(L) --> pi0 pi0 nu nu-bar was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4 x 10^9 K0L decays, an upper limit of 8.1 x 10^{-7} was obtained for the branching fraction at 90% confidence level. We also set a limit on the K0(L) --> pi0 pi0 X (X --> invisible particles) process; the limit on the branching fraction varied from 7.0 x 10^{-7} to 4.0 x 10^{-5} for the mass of X ranging from 50 MeV/c^2 to 200 MeV/c^2.
  06/2011;
• Source

  Available from: Anatoly Lednev

  Article: Search for the decay $K_L^0 \rightarrow 3\gamma$

  Y. C. Tung, Y. B. Hsiung, J K Ahn, Y. Akune, V. Baranov, K.-F. Chen, J. Comfort, M. Doroshenko, Y Fujioka, T Inagaki, [......], Z. Tsamalaidze, T Tsukamoto, Y. Wah, H Watanabe, M. L. Wu, M Yamaga, T Yamanaka, H. Y. Yoshida, Y Yoshimura, Y Zheng
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  ABSTRACT: We performed a search for the decay $K_L^0 \rightarrow 3\gamma$ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-violation, we obtained the single event sensitivity to be $(3.23\pm0.14)\times10^{-8}$, and set an upper limit on the branching ratio to be $7.4\times10^{-8}$ at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-conservation were also presented in this paper.
  11/2010;
• Article: Experimental study of the decay KL0→π0νν¯

  J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, Y. Fujioka, Y. B. Hsiung, T. Inagaki, S. Ishibashi, [......], Y. C. Tung, Y. W. Wah, H. Watanabe, M. L. Wu, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura, Y. Zheng, Collaboration
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  ABSTRACT: The first dedicated search for the rare neutral-kaon decay KL0→π0νν¯ has been carried out in the E391a experiment at the KEK 12-GeV proton synchrotron. The final upper limit of 2.6×10-8 at the 90% confidence level was set on the branching ratio for the decay.
  Physical review D: Particles and fields 03/2010; 81(7):72004.
• Source

  Available from: Anatoly Lednev

  Article: Search for a light pseudoscalar particle in the decay K_{L};{0}-->pi;{0}pi;{0}X.

  Y C Tung, Y B Hsiung, M L Wu, K F Chen, J K Ahn, Y Akune, V Baranov, J Comfort, M Doroshenko, Y Fujioka, [......], S Takita, Z Tsamalaidze, T Tsukamoto, Y Wah, H Watanabe, M Yamaga, T Yamanaka, H Y Yoshida, Y Yoshimura, Y Zheng
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  ABSTRACT: We performed a search for a light pseudoscalar particle X in the decay K_{L};{0}-->pi;{0}pi;{0}X, X-->gammagamma with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/c;{2} was suggested by the HyperCP experiment. We found no evidence for X and set an upper limit on the product branching ratio for K_{L};{0}-->pi;{0}pi;{0}X, X-->gammagamma of 2.4x10;{-7} at the 90% confidence level. Upper limits on the branching ratios in the mass region of X from 194.3 to 219.3 MeV/c;{2} are also presented.
  Physical Review Letters 02/2009; 102(5):051802. · 7.37 Impact Factor
• Source

  Available from: Anatoly Lednev

  Article: Search for a light pseudoscalar particle in the decay $K^0_L \to \pi^0 \pi^0 X$

  Y. C. Tung, Y. B. Hsiung, M. L. Wu, K.-F. Chen, J K Ahn, Y. Akune, V. Baranov, J. Comfort, M. Doroshenko, Y Fujioka, [......], S Takita, Z. Tsamalaidze, T Tsukamoto, Y. Wah, H Watanabe, M Yamaga, T Yamanaka, H. Y. Yoshida, Y Yoshimura, Y Zheng
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  ABSTRACT: We performed a search for a light pseudoscalar particle $X$ in the decay $K_L^0->pi0pi0X$, $X->\gamma\gamma$ with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/$c^2$ was suggested by the HyperCP experiment. We found no evidence for $X$ and set an upper limit on the product branching ratio for $K_L^0->pi0pi0X$, $X->\gamma\gamma$ of $2.4 \times 10^{-7}$ at the 90% confidence level. Upper limits on the branching ratios in the mass region of $X$ from 194.3 to 219.3 MeV/$c^2$ are also presented. Comment: 5 pages, 5 figures
  10/2008;
• Article: Search for the Decay K L0-->pi0nu nu[over].

  J K Ahn, Y Akune, V Baranov, K F Chen, J Comfort, M Doroshenko, Y Fujioka, Y B Hsiung, T Inagaki, S Ishibashi, [......], Z Tsamalaidze, T Tsukamoto, Y C Tung, Y W Wah, H Watanabe, M L Wu, M Yamaga, T Yamanaka, H Y Yoshida, Y Yoshimura
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  ABSTRACT: We performed a search for the K L0-->pi0nu nu[over] decay at the KEK 12-GeV proton synchrotron. No candidate events were observed. An upper limit on the branching ratio for the decay was set to be 6.7 x 10(-8) at the 90% confidence level.
  Physical Review Letters 05/2008; 100(20):201802. · 7.37 Impact Factor
• Article: Search for the Decay KL0→π0νν¯

  J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, Y. Fujioka, Y. B. Hsiung, T. Inagaki, S. Ishibashi, [......], Z. Tsamalaidze, T. Tsukamoto, Y. C. Tung, Y. W. Wah, H. Watanabe, M. L. Wu, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura
  [show abstract] [hide abstract]
  ABSTRACT: We performed a search for the KL0→π0νν¯ decay at the KEK 12-GeV proton synchrotron. No candidate events were observed. An upper limit on the branching ratio for the decay was set to be 6.7×10-8 at the 90% confidence level.
  Physical Review Letters 04/2008; 100(20):201802. · 7.37 Impact Factor
• Article: Lipid myopathy associated with renal tubular acidosis and spastic diplegia in two brothers.

  Y C Tung, Y K Tsau, L W Chu, C Young, Y Z Shen
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  ABSTRACT: Lipid myopathy is a group of disorders involving mitochondrial fatty acid oxidation. We describe two brothers, 3 years 8 months old and 2 years 9 months old, respectively, with progressive spastic diplegia, developmental delay, failure to thrive, and chronic metabolic acidosis who had lipid myopathy and renal tubular acidosis. Brain magnetic resonance imaging revealed demyelinating changes in the periventricular white matter, which was compatible with spastic diplegia. These symptoms may be related to errors in fatty acid metabolism. Cerebral palsy had been misdiagnosed in both of these patients at another hospital. Therefore, for patients with late-onset and progressive spastic diplegia, detailed investigations for underlying diseases are warranted.
  Journal of the Formosan Medical Association 08/2001; 100(7):484-7. · 1.13 Impact Factor
• Article: Study of the KL0→π0π0νν̅ decay

  R. Ogata, S. Suzuki, J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, Y. Fujioka, Y. B. Hsiung, [......], T. Tsukamoto, Y. C. Tung, Y. W. Wah, H. Watanabe, M. L. Wu, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura, Y. Zheng
  [show abstract] [hide abstract]
  ABSTRACT: The rare decay KL0→π0π0νν̅ was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4×109 KL0 decays, an upper limit of 8.1×10-7 was obtained for the branching fraction at 90% confidence level. We also set a limit on the KL0→π0π0X (X→invisible particles) process; the limit on the branching fraction varied from 7.0×10-7 to 4.0×10-5 for the mass of X ranging from 50 MeV/c2 to 200 MeV/c2.
  Phys. Rev. D. 84(5).