New search for τ→μγ and τ→eγ decays at Belle

  title={New search for τ→μγ and τ→eγ decays at Belle},
  author={K. Hayasaka and K. Abe and I. Adachi and H. Aihara and D. Anipko and K. Arinstein and V. Aulchenko and A. M. Bakich and E. Barberio and A. Bay and I. Bedny and K. Belous and U. Bitenc and I. Bizjak and A. Bondar and A. Bozek and M. Bra{\vc}ko and J. Brodzicka and M. C. Chang and P. Chang and Y. Chao and A. Chen and W. T. Chen and B. G. Cheon and R. Chistov and Y. Choi and Y. K. Choi and J. Dalseno and M. Danilov and Manmohan Dash and A. Drutskoy and S. Eidelman and D. Epifanov and S. Fratina and N. Gabyshev and T. Gershon and A. Go and B. Golob and H. Ha and J. Haba and K. Hara and T. Hara and H. Hayashii and M. Hazumi and D. Heffernan and T. Hokuue and Y. Hoshi and S. Hou and W. S. Hou and T. Iijima and K. Ikado and A. Imoto and K. Inami and A. Ishikawa and R. Itoh and Masahiko Iwasaki and Yasumasa Iwasaki and H. Kaji and J. H. Kang and H. Kawai and T. Kawasaki and H. R. Khan and H. Kichimi and S. K. Kim and Y. J. Kim and Y. Kozakai and P. Kri{\vz}an and P. Krokovny and R. Kulasiri and R. Kumar and C. C. Kuo and A. Kuzmin and Y. J. Kwon and M. J. Lee and S. E. Lee and T. Lesiak and S. W. Lin and D. Liventsev and F. Mandl and T. Matsumoto and K. Miyabayashi and H. Miyake and H. Miyata and Y. Miyazaki and G. R. Moloney and T. Mori and Y. Nagasaka and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and O. Nitoh and S. Ogawa and Takayoshi Ohshima and S. Okuno and S. L. Olsen and Y. Onuki and H. Ozaki and Pavel N. Pakhlov and G. Pakhlova and H. Park and K. S. Park and Lawrence Peak and R. Pestotnik and L. E. Piilonen and A. Poluektov and H. Sahoo and Y. Sakai and N. Satoyama and T. Schietinger and O. Schneider and Alan J. Schwartz and R. Seidl and K. Senyo and M. E. Sevior and M. Shapkin and H. Shibuya and B. Shwartz and J. B. Singh and A. Sokolov and A. Somov and N. Soni and S. Stani{\vc} and M. Stari{\vc} and H. Stoeck and Takayuki Sumiyoshi and F. Takasaki and K. Tamai and N. Tamura and Masayuki Tanaka and G. N. Taylor and Y. Teramoto and X. C. Tian and I. Tikhomirov and T. Tsuboyama and T. Tsukamoto and S. Uehara and K. Ueno and T. Uglov and S. Uno and P. Urquijo and Y. Usov and G. Varner and S. Villa and A. Vinokurova and C. C. Wang and C. H. Wang and Y. Watanabe and Eun Il Won and Q. L. Xie and B. D. Yabsley and A. Yamaguchi and Y. Yamashita and M. Yamauchi and Z. P. Zhang and V. Zhilich and V. Zhulanov and A. Zupanc},
Abstract We report on a search for the lepton flavor violating τ − → μ − γ and τ − → e − γ decays based on 535 fb −1 of data accumulated at the Belle experiment. No signal is found and we set 90% confidence level upper limits on the branching ratios B ( τ − → μ − γ ) 4.5 × 10 −8 and B ( τ − → e − γ ) 1.2 × 10 −7 . 

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