Journal of High Energy Physics (Oct 2021)
Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle
- The BELLE collaboration,
- K. Uno,
- K. Hayasaka,
- K. Inami,
- I. Adachi,
- H. Aihara,
- D. M. Asner,
- H. Atmacan,
- T. Aushev,
- R. Ayad,
- V. Babu,
- J. Bennett,
- F. Bernlochner,
- M. Bessner,
- V. Bhardwaj,
- J. Biswal,
- A. Bobrov,
- G. Bonvicini,
- A. Bozek,
- M. Bračko,
- M. Campajola,
- D. Červenkov,
- M.-C. Chang,
- H. E. Cho,
- K. Cho,
- S.-J. Cho,
- S.-K. Choi,
- Y. Choi,
- S. Choudhury,
- D. Cinabro,
- S. Cunliffe,
- N. Dash,
- F. Di Capua,
- J. Dingfelder,
- Z. Doležal,
- T. V. Dong,
- S. Eidelman,
- D. Epifanov,
- T. Ferber,
- A. Frey,
- B. G. Fulsom,
- R. Garg,
- V. Gaur,
- N. Gabyshev,
- A. Garmash,
- A. Giri,
- P. Goldenzweig,
- C. Hadjivasiliou,
- T. Hara,
- O. Hartbrich,
- H. Hayashii,
- M. Hernandez Villanueva,
- W.-S. Hou,
- C.-L. Hsu,
- T. Iijima,
- G. Inguglia,
- A. Ishikawa,
- R. Itoh,
- M. Iwasaki,
- W. W. Jacobs,
- Y. Jin,
- K. K. Joo,
- K. H. Kang,
- Y. Kato,
- H. Kichimi,
- C. Kiesling,
- C. H. Kim,
- D. Y. Kim,
- K.-H. Kim,
- S. H. Kim,
- P. Kodyš,
- T. Konno,
- A. Korobov,
- S. Korpar,
- E. Kovalenko,
- P. Križan,
- R. Kroeger,
- P. Krokovny,
- T. Kuhr,
- M. Kumar,
- R. Kumar,
- K. Kumara,
- A. Kuzmin,
- Y.-J. Kwon,
- Y.-T. Lai,
- J. S. Lange,
- S. C. Lee,
- Y. B. Li,
- L. Li Gioi,
- J. Libby,
- K. Lieret,
- D. Liventsev,
- C. MacQueen,
- M. Masuda,
- K. Matsuoka,
- D. Matvienko,
- M. Merola,
- F. Metzner,
- K. Miyabayashi,
- R. Mizuk,
- G. B. Mohanty,
- M. Nakao,
- H. Nakazawa,
- A. Natochii,
- L. Nayak,
- M. Niiyama,
- N. K. Nisar,
- S. Nishida,
- K. Nishimura,
- K. Ogawa,
- S. Ogawa,
- P. Oskin,
- P. Pakhlov,
- G. Pakhlova,
- S. Pardi,
- H. Park,
- S.-H. Park,
- S. Paul,
- R. Pestotnik,
- L. E. Piilonen,
- T. Podobnik,
- E. Prencipe,
- M. T. Prim,
- M. Röhrken,
- A. Rostomyan,
- N. Rout,
- G. Russo,
- D. Sahoo,
- Y. Sakai,
- S. Sandilya,
- A. Sangal,
- L. Santelj,
- T. Sanuki,
- V. Savinov,
- G. Schnell,
- C. Schwanda,
- Y. Seino,
- K. Senyo,
- M. E. Sevior,
- C. Sharma,
- C. P. Shen,
- J.-G. Shiu,
- B. Shwartz,
- F. Simon,
- A. Sokolov,
- E. Solovieva,
- M. Starič,
- Z. S. Stottler,
- M. Sumihama,
- T. Sumiyoshi,
- W. Sutcliffe,
- M. Takizawa,
- K. Tanida,
- Y. Tao,
- F. Tenchini,
- K. Trabelsi,
- M. Uchida,
- S. Uehara,
- T. Uglov,
- Y. Unno,
- S. Uno,
- P. Urquijo,
- Y. Ushiroda,
- Y. Usov,
- S. E. Vahsen,
- R. Van Tonder,
- G. Varner,
- A. Vinokurova,
- A. Vossen,
- E. Waheed,
- C. H. Wang,
- E. Wang,
- M.-Z. Wang,
- X. L. Wang,
- O. Werbycka,
- E. Won,
- B. D. Yabsley,
- W. Yan,
- H. Ye,
- J. H. Yin,
- Y. Yusa,
- Z. P. Zhang,
- V. Zhilich,
- V. Zhukova
Affiliations
- The BELLE collaboration
- K. Uno
- Niigata University
- K. Hayasaka
- Niigata University
- K. Inami
- Graduate School of Science, Nagoya University
- I. Adachi
- SOKENDAI (The Graduate University for Advanced Studies)
- H. Aihara
- Department of Physics, University of Tokyo
- D. M. Asner
- Brookhaven National Laboratory
- H. Atmacan
- University of Cincinnati
- T. Aushev
- National Research University Higher School of Economics
- R. Ayad
- Department of Physics, Faculty of Science, University of Tabuk
- V. Babu
- Deutsches Elektronen-Synchrotron
- J. Bennett
- University of Mississippi
- F. Bernlochner
- University of Bonn
- M. Bessner
- University of Hawaii
- V. Bhardwaj
- Indian Institute of Science Education and Research Mohali
- J. Biswal
- J. Stefan Institute
- A. Bobrov
- Budker Institute of Nuclear Physics SB RAS
- G. Bonvicini
- Wayne State University
- A. Bozek
- H. Niewodniczanski Institute of Nuclear Physics
- M. Bračko
- J. Stefan Institute
- M. Campajola
- INFN - Sezione di Napoli
- D. Červenkov
- Faculty of Mathematics and Physics, Charles University
- M.-C. Chang
- Department of Physics, Fu Jen Catholic University
- H. E. Cho
- Department of Physics and Institute of Natural Sciences, Hanyang University
- K. Cho
- Korea Institute of Science and Technology Information
- S.-J. Cho
- Yonsei University
- S.-K. Choi
- Gyeongsang National University
- Y. Choi
- Sungkyunkwan University
- S. Choudhury
- Indian Institute of Technology Hyderabad
- D. Cinabro
- Wayne State University
- S. Cunliffe
- Deutsches Elektronen-Synchrotron
- N. Dash
- Indian Institute of Technology Madras
- F. Di Capua
- INFN - Sezione di Napoli
- J. Dingfelder
- University of Bonn
- Z. Doležal
- Faculty of Mathematics and Physics, Charles University
- T. V. Dong
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University
- S. Eidelman
- Budker Institute of Nuclear Physics SB RAS
- D. Epifanov
- Budker Institute of Nuclear Physics SB RAS
- T. Ferber
- Deutsches Elektronen-Synchrotron
- A. Frey
- II. Physikalisches Institut, Georg-August-Universität Göttingen
- B. G. Fulsom
- Pacific Northwest National Laboratory
- R. Garg
- Panjab University
- V. Gaur
- Virginia Polytechnic Institute and State University
- N. Gabyshev
- Budker Institute of Nuclear Physics SB RAS
- A. Garmash
- Budker Institute of Nuclear Physics SB RAS
- A. Giri
- Indian Institute of Technology Hyderabad
- P. Goldenzweig
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- C. Hadjivasiliou
- Pacific Northwest National Laboratory
- T. Hara
- SOKENDAI (The Graduate University for Advanced Studies)
- O. Hartbrich
- University of Hawaii
- H. Hayashii
- Nara Women’s University
- M. Hernandez Villanueva
- University of Mississippi
- W.-S. Hou
- Department of Physics, National Taiwan University
- C.-L. Hsu
- School of Physics, University of Sydney
- T. Iijima
- Graduate School of Science, Nagoya University
- G. Inguglia
- Institute of High Energy Physics
- A. Ishikawa
- SOKENDAI (The Graduate University for Advanced Studies)
- R. Itoh
- SOKENDAI (The Graduate University for Advanced Studies)
- M. Iwasaki
- Osaka City University
- W. W. Jacobs
- Indiana University
- Y. Jin
- Department of Physics, University of Tokyo
- K. K. Joo
- Chonnam National University
- K. H. Kang
- Kyungpook National University
- Y. Kato
- Graduate School of Science, Nagoya University
- H. Kichimi
- High Energy Accelerator Research Organization (KEK)
- C. Kiesling
- Max-Planck-Institut für Physik
- C. H. Kim
- Department of Physics and Institute of Natural Sciences, Hanyang University
- D. Y. Kim
- Soongsil University
- K.-H. Kim
- Yonsei University
- S. H. Kim
- Seoul National University
- P. Kodyš
- Faculty of Mathematics and Physics, Charles University
- T. Konno
- Kitasato University
- A. Korobov
- Budker Institute of Nuclear Physics SB RAS
- S. Korpar
- J. Stefan Institute
- E. Kovalenko
- Budker Institute of Nuclear Physics SB RAS
- P. Križan
- J. Stefan Institute
- R. Kroeger
- University of Mississippi
- P. Krokovny
- Budker Institute of Nuclear Physics SB RAS
- T. Kuhr
- Ludwig Maximilians University
- M. Kumar
- Malaviya National Institute of Technology Jaipur
- R. Kumar
- Punjab Agricultural University
- K. Kumara
- Wayne State University
- A. Kuzmin
- Budker Institute of Nuclear Physics SB RAS
- Y.-J. Kwon
- Yonsei University
- Y.-T. Lai
- High Energy Accelerator Research Organization (KEK)
- J. S. Lange
- Justus-Liebig-Universität Gießen
- S. C. Lee
- Kyungpook National University
- Y. B. Li
- Peking University
- L. Li Gioi
- Max-Planck-Institut für Physik
- J. Libby
- Indian Institute of Technology Madras
- K. Lieret
- Ludwig Maximilians University
- D. Liventsev
- High Energy Accelerator Research Organization (KEK)
- C. MacQueen
- School of Physics, University of Melbourne
- M. Masuda
- Research Center for Nuclear Physics, Osaka University
- K. Matsuoka
- SOKENDAI (The Graduate University for Advanced Studies)
- D. Matvienko
- Budker Institute of Nuclear Physics SB RAS
- M. Merola
- INFN - Sezione di Napoli
- F. Metzner
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- K. Miyabayashi
- Nara Women’s University
- R. Mizuk
- National Research University Higher School of Economics
- G. B. Mohanty
- Tata Institute of Fundamental Research
- M. Nakao
- SOKENDAI (The Graduate University for Advanced Studies)
- H. Nakazawa
- Department of Physics, National Taiwan University
- A. Natochii
- University of Hawaii
- L. Nayak
- Indian Institute of Technology Hyderabad
- M. Niiyama
- Kyoto Sangyo University
- N. K. Nisar
- Brookhaven National Laboratory
- S. Nishida
- SOKENDAI (The Graduate University for Advanced Studies)
- K. Nishimura
- University of Hawaii
- K. Ogawa
- Niigata University
- S. Ogawa
- Toho University
- P. Oskin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences
- P. Pakhlov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences
- G. Pakhlova
- National Research University Higher School of Economics
- S. Pardi
- INFN - Sezione di Napoli
- H. Park
- Kyungpook National University
- S.-H. Park
- High Energy Accelerator Research Organization (KEK)
- S. Paul
- Max-Planck-Institut für Physik
- R. Pestotnik
- J. Stefan Institute
- L. E. Piilonen
- Virginia Polytechnic Institute and State University
- T. Podobnik
- J. Stefan Institute
- E. Prencipe
- Forschungszentrum Jülich
- M. T. Prim
- University of Bonn
- M. Röhrken
- Deutsches Elektronen-Synchrotron
- A. Rostomyan
- Deutsches Elektronen-Synchrotron
- N. Rout
- Indian Institute of Technology Madras
- G. Russo
- Università di Napoli Federico II
- D. Sahoo
- Tata Institute of Fundamental Research
- Y. Sakai
- SOKENDAI (The Graduate University for Advanced Studies)
- S. Sandilya
- Indian Institute of Technology Hyderabad
- A. Sangal
- University of Cincinnati
- L. Santelj
- J. Stefan Institute
- T. Sanuki
- Department of Physics, Tohoku University
- V. Savinov
- University of Pittsburgh
- G. Schnell
- Department of Physics, University of the Basque Country UPV/EHU
- C. Schwanda
- Institute of High Energy Physics
- Y. Seino
- Niigata University
- K. Senyo
- Yamagata University
- M. E. Sevior
- School of Physics, University of Melbourne
- C. Sharma
- Malaviya National Institute of Technology Jaipur
- C. P. Shen
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University
- J.-G. Shiu
- Department of Physics, National Taiwan University
- B. Shwartz
- Budker Institute of Nuclear Physics SB RAS
- F. Simon
- Max-Planck-Institut für Physik
- A. Sokolov
- Institute for High Energy Physics
- E. Solovieva
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences
- M. Starič
- J. Stefan Institute
- Z. S. Stottler
- Virginia Polytechnic Institute and State University
- M. Sumihama
- Gifu University
- T. Sumiyoshi
- Tokyo Metropolitan University
- W. Sutcliffe
- University of Bonn
- M. Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK)
- K. Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency
- Y. Tao
- University of Florida
- F. Tenchini
- Deutsches Elektronen-Synchrotron
- K. Trabelsi
- Université Paris-Saclay, CNRS/IN2P3, IJCLab
- M. Uchida
- Tokyo Institute of Technology
- S. Uehara
- SOKENDAI (The Graduate University for Advanced Studies)
- T. Uglov
- National Research University Higher School of Economics
- Y. Unno
- Department of Physics and Institute of Natural Sciences, Hanyang University
- S. Uno
- SOKENDAI (The Graduate University for Advanced Studies)
- P. Urquijo
- School of Physics, University of Melbourne
- Y. Ushiroda
- SOKENDAI (The Graduate University for Advanced Studies)
- Y. Usov
- Budker Institute of Nuclear Physics SB RAS
- S. E. Vahsen
- University of Hawaii
- R. Van Tonder
- University of Bonn
- G. Varner
- University of Hawaii
- A. Vinokurova
- Budker Institute of Nuclear Physics SB RAS
- A. Vossen
- Duke University
- E. Waheed
- High Energy Accelerator Research Organization (KEK)
- C. H. Wang
- National United University
- E. Wang
- University of Pittsburgh
- M.-Z. Wang
- Department of Physics, National Taiwan University
- X. L. Wang
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University
- O. Werbycka
- H. Niewodniczanski Institute of Nuclear Physics
- E. Won
- Korea University
- B. D. Yabsley
- School of Physics, University of Sydney
- W. Yan
- Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China
- H. Ye
- Deutsches Elektronen-Synchrotron
- J. H. Yin
- Korea University
- Y. Yusa
- Niigata University
- Z. P. Zhang
- Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China
- V. Zhilich
- Budker Institute of Nuclear Physics SB RAS
- V. Zhukova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences
- DOI
- https://doi.org/10.1007/JHEP10(2021)019
- Journal volume & issue
-
Vol. 2021,
no. 10
pp. 1 – 16
Abstract
Abstract Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ ± → ℓ ± γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ ± → ℓ ± γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb −1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B $$ \mathcal{B} $$ (τ ± → μ ± γ) ≤ 4.2 × 10 −8 and B $$ \mathcal{B} $$ (τ ± → e ± γ) ≤ 5.6 × 10 −8, are set at 90% confidence level.
Keywords
