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Title: Observation of t- -> p- vte+ e- and search for t- -> p-vtµ+ µ-

Abstract

We present the first measurements of branching fractions of rare tau-lepton decays, t- ? p-?tlþl-(l ¼ e or µ), using a data sample corresponding to 562 fb-1 collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy eþe- collider. The t- ? p-?teþe-decay is observed for the first time with 7.0s significance. The partial branching fraction determined by the structure-dependent mechanisms mediated by either a vector or an axial-vector current for the mass region Mpee > 1.05 GeV=c2 is measured to be Bðt- ? p-?teþe-Þ½Mp-eþe- > 1.05 GeV=c2_ ¼ ð5.90 _ 0.53 _ 0.85 _ 0.11Þ × 10-6, where the first uncertainty is statistical, the second is systematic, and the third is due to model dependence. In the full phase space, due to the different detection efficiencies for the structure-dependent mechanisms mediated by axial-vector and vector currents, the branching fraction varies from BAðt- ? p-?teþe-Þ ¼ ð1.46 _ 0.13 _ 0.21Þ × 10-5 to BVðt- ? p-?teþe-Þ ¼ ð3.01 _ 0.27 _ 0.43Þ × 10-5, respectively. An upper limit is set on the branching fraction of the t- ? p-?tµþµ- decay, Bðt- ? p-?tµþµ-Þ < 1.14 × 10-5, at the 90% confidence level.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [3];  [7];  [8];  [9];  [10];  [11]; ORCiD logo [12];  [13];  [14];  [15];  [16];  [17];  [3];  [18] more »;  [19];  [20];  [21];  [22];  [16];  [23];  [24];  [25];  [26];  [25];  [27];  [28];  [29];  [18];  [30];  [31];  [16];  [32];  [33];  [3];  [12];  [34]; ORCiD logo [12];  [35];  [36];  [3];  [3];  [37];  [38];  [39];  [40];  [19];  [41];  [42];  [43];  [44];  [45];  [45];  [46];  [46];  [47];  [48];  [49];  [48];  [50];  [51];  [52];  [53];  [54];  [55];  [13];  [56];  [57];  [48];  [58];  [59];  [51];  [60];  [25];  [61];  [62];  [63];  [44];  [39];  [64];  [65];  [66];  [67];  [3];  [68];  [69];  [70];  [71];  [51];  [72];  [73];  [74];  [75];  [13];  [55];  [76];  [36];  [45];  [77];  [78];  [1];  [79];  [3];  [80];  [43];  [81];  [82];  [46];  [83];  [49];  [48];  [29];  [19];  [84];  [85];  [86];  [48];  [87];  [88];  [1];  [82];  [26];  [6];  [89];  [51];  [68];  [90];  [91];  [92];  [93];  [94];  [7];  [95];  [96];  [34];  [97];  [98];  [48];  [99];  [100];  [101];  [102];  [103];  [104];  [105];  [76];  [47];  [81];  [106];  [46];  [33];  [76];  [52];  [107];  [3];  [108];  [35];  [47];  [26];  [109];  [93];  [110]; ORCiD logo [12];  [111];  [112];  [113];  [114];  [9];  [4];  [115];  [7];  [116];  [48];  [33];  [3];  [117];  [76];  [3];  [3];  [118];  [75];  [119];  [45];  [120];  [102];  [60];  [60];  [121];  [122];  [73];  [81];  [123];  [3];  [26] « less
  1. University of Tokyo
  2. Department of Physics, University of Tokyo, Tokyo
  3. Novosibirsk State University
  4. High Energy Accelerator Research Organization (KEK), Tsukuba
  5. King Abdulaziz University
  6. Brookhaven National Laboratory
  7. Moscow Institute of Physics and Technology
  8. University of Tabuk
  9. Deutsches Elektronen-Synchrotron
  10. King Abdulaziz City for Science and Technology
  11. Indian Institute of Technology Bhubaneswa
  12. BATTELLE (PACIFIC NW LAB)
  13. Indian Institute of Technology Madras
  14. Stefan Meyer Institute for Subatomic Physics
  15. Indian INstitute of Science Education and Research Mohali, SAS Nagar
  16. Charles University
  17. J. Stefan Institute
  18. WAYNE STATE UNIVERSITY
  19. H. Niewodniczanski Institute of Nuclear Physics
  20. JOZEF STEFAN INSTITUTE
  21. INFN-Sezione di Napoli
  22. Karlsruhe Institute of Technology
  23. Max-Planck-Institut fr Physik
  24. National Central University
  25. Hanyang University
  26. P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  27. Korea Institute of Science and Technology Information
  28. Sungkyunkwan University
  29. Indian Institute of Technology
  30. Desy
  31. LAL
  32. Grad Univ Adv Studies, SOKENDAJ, Hayama 2400193 Japan
  33. University of Melbourne
  34. Deutsches ElektronenSynchrotron
  35. Panjab University
  36. Virginia Polytechnic Institute
  37. Indian Inst Technol Hyderabad, Hyderabad 5022285, Telangana, India
  38. Institut fr Experimentelle Kernphysik, Karlsruher Institut fr Technologie
  39. Univerza v Ljubljani
  40. Technische Universitat Munchen
  41. 9High Energy Accelerator Research Organization (KEK)
  42. Niigata University, Niigata
  43. Nara Women's University
  44. UNIVERSITY OF HAWAII
  45. National Taiwan University
  46. Nagoya University
  47. Institute of High Energy Physics
  48. High Energy Accelerator Research Organization (KEK)
  49. Osaka University
  50. Indiana University-Bloomington
  51. Kyungpook National University
  52. Beihang University
  53. Kennesaw State University
  54. Chonnam National University
  55. Ludwig-Maximilians-University Munich
  56. Deutsches Elektronen–Synchrotron
  57. Kitasato University
  58. Max-Planck-Institut fur Physik, Munchen
  59. Soongsil University
  60. Korea University
  61. UNIVERSITY OF CINCINNATI
  62. Faculty of Mathematics and Physics, Charles University, Prague
  63. Univerza v Mariboru
  64. University of Mississippi
  65. BUDKER INSTITUTE OF NUCLEAR PHYSICS
  66. KENNESAW STATE UNIVERSITY
  67. Punjab Agricultural University
  68. Yonsei University
  69. Malaviya National Institute of Technology Jaipur
  70. Justus-Liebig-Universitat Gieben
  71. Seoul National University
  72. Liaoning Normal University
  73. Institute of High Energy Physics, Chinese Academy of Sciences
  74. Peking University
  75. Max-Planck-Institut fur Physik
  76. University of Hawaii
  77. Fudan University
  78. University of Miyazaki
  79. University of Miyazaki, Miyazaki
  80. INFN - Sezione di Napoli
  81. Niigata University
  82. Moscow Engineering Physics Institute
  83. INFN - Sezione di Torino
  84. Wayne State University, Detroit MI
  85. Kyoto University
  86. University of Pittsburgh, Pittsburgh, PA
  87. Toho University
  88. Nippon Dental University, Niigata
  89. INFN, Sez Napoli, I-80126, Naples, Italy
  90. Indian Institute of Science Education and Research Mohali
  91. Technische Universität München
  92. Luther College
  93. J Stefan Institute
  94. VIRGINIA POLYTECHNIC INSTITUTE
  95. Forschungszenitrum, Julich, D-52425 Julich, Germany
  96. University of South Carolina
  97. INFN, Sez Napoli, I-80126 Naples, Italy
  98. Client
  99. University of Malaya
  100. Univeristy of Cincinnati, Cincinnati, OH
  101. High Energy Accelerator Research Organization-KEK
  102. Tohoku University
  103. UNIVERSITY OF PITTSBURGH
  104. Ecole Polytechnique Federale de Lausanne
  105. Ikerbasque
  106. Yamagata University
  107. NATIONAL TAIWAN UNIVERSITY
  108. Max-Planck-Institut für Physik
  109. Univerza v Novi Gorici
  110. Virginia Polytechnic Institute and State University
  111. Tokyo Metropolitan University
  112. Showa Pharmaceutical University
  113. INSTITUTO NAZIONALE DI FISICA NUCLEARE
  114. Advanced Science Research Center, Japan Atomic Energy Agency, Naka
  115. Tokyo Institute of Technology
  116. HANYANG UNIVERSITY
  117. Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
  118. Duke University
  119. National United University
  120. Chinese Academy of Sciences
  121. DESY, D22607 Hamburg, Germany
  122. Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, China
  123. University of Science and Technology of China
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1577438
Report Number(s):
PNNL-SA-149804
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Jin, Y, Aihara, H, Epifanov, D, Adachi, I, Al Said, S, Asner, David, Aulchenko, V, Aushev, T, Ayad, R, Babu, V, Badhrees, I, Bahinipati, S, Bansal, Vikas, Behera, P, Berger, M, Bhardwaj, V, Bilka, T, Biswal, J, Bobrov, A, Bonvicini, Giovanni, Bozek, A, Bracko, Marko, Campajola, M, Cao, Lu, Cervenkov, D, Chekelian, V, Chen, A, Cheon, B G., Chilikin, K, Cho, H.E., Cho, K, Choi, Y, Choudhury, S, Cinabro, David A., Cunliffe, Samuel T., Di Carlo, Salvatore, Dolezal, Z, Dong, Thanh V., Dossett, D, Eidelman, S, Fast, James E., Ferber, T, Fulsom, Bryan G., Garg, Renu, Gaur, Vipin, Gabyshev, N, Garmash, A, Giri, Anjan, Goldenzweig, P, Golob, B, Greenwald, D, Grzymkowska, O, Haba, J, Hayasaka, K, Hayashii, H, Hedges, Michael T., Hou, W S., Huang, K, Iijima, T, Inami, K, Inguglia, G, Ishikawa, A, Iwasaki, M, Iwasaki, Y, Jacobs, W W., Jeon, H B., Jia, S, Joffe, D, Joo, K K., Kahn, J, Kaliyar, A B., Karyan, G, Kawasaki, T, Kichimi, H, Kiesling, C, Kim, D Y., Kim, H J., Kim, K T., Kim, S H., Kinoshita, Kay, Kodys, P, Korpar, S, Kotchetkov, Dmitri V., Krizan, P, Kroeger, Robert S., Krokovny, Pavel, Kulasiri, Ratnappuli H., Kumar, R, Kuzmin, A, Kwon, Y J., Lalwani, Kavita, Lange, J S., Lee, J.Y., Lee, S.C., Li, C.H., Li, L K., Li, Y.B., Li Gioi, L, Libby, J, Lieret, K., Liptak, Z, Liventsev, D, Lu, P C., Luo, T, Macnaughton, J, Masuda, M, Matsuda, T., Matvienko, D, Merola, M, Miyabayashi, K, Miyata, H, Mizuk, R, Mori, T, Mussa, R, Nakano, E, Nakao, M, Nath, K, Natkaniec, Z, Nayak, M, Niiyama, M, Nisar, N K., Nishida, S, Ogawa, S, Ono, H, Onuki, Y, Pakhlov, P, Pakhlova, G, Pal, Bilas K., Pardi, Silvio, Park, H, Park, S H., Patra, S, Paul, S, Pedlar, Todd, Pestotnik, R, Piilonen, Leo E., Popov, V, Prencipe, Elisabetta, Purohit, Milind V., Rostomyan, A, Russo, Guido, Sahoo, Dipankar, Sakai, Y, Salehi, M, Sandilya, S, Santelj, L, Sanuki, T, Savinov, Vladimir, Schneider, O, Schnell, G, Schueler, J, Schwanda, C, Seino, Y, Senyo, K, Seon, O, Sevior, ME, Shebalin, V., Shen, C P., Shiu, Jing-Ge, Shwartz, B, Simon, F, Singh, J B., Sokolov, A, Solovieva, E, Stanic, S, Staric, M, Stottler, Z.S., Strube, Jan F., Sumiyoshi, T, Takizawa, M, Tamponi, Umberto, Tanida, K, Tenchini, F, Trabelsi, K, Uchida, M, Uglov, T, Unno, Yuji, Uno, S, Urquijo, P, Usov, Y, Van Tonder, R, Varner, G, Vinokurova, A, Vorobyev, V, Vossen, Anselm G., Wang, B, Wang, C H., Wang, M Z., Wang, P, Watanuki, S, Won, E, Yang, S B., Ye, Hua, Yin, Junhao, Yuan, C Z., Yusa, Y, Zhang, Z P., Zhilich, V, and Zhukova, V. Observation of t- -> p- vte+ e- and search for t- -> p-vtµ+ µ-. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.071101.
Jin, Y, Aihara, H, Epifanov, D, Adachi, I, Al Said, S, Asner, David, Aulchenko, V, Aushev, T, Ayad, R, Babu, V, Badhrees, I, Bahinipati, S, Bansal, Vikas, Behera, P, Berger, M, Bhardwaj, V, Bilka, T, Biswal, J, Bobrov, A, Bonvicini, Giovanni, Bozek, A, Bracko, Marko, Campajola, M, Cao, Lu, Cervenkov, D, Chekelian, V, Chen, A, Cheon, B G., Chilikin, K, Cho, H.E., Cho, K, Choi, Y, Choudhury, S, Cinabro, David A., Cunliffe, Samuel T., Di Carlo, Salvatore, Dolezal, Z, Dong, Thanh V., Dossett, D, Eidelman, S, Fast, James E., Ferber, T, Fulsom, Bryan G., Garg, Renu, Gaur, Vipin, Gabyshev, N, Garmash, A, Giri, Anjan, Goldenzweig, P, Golob, B, Greenwald, D, Grzymkowska, O, Haba, J, Hayasaka, K, Hayashii, H, Hedges, Michael T., Hou, W S., Huang, K, Iijima, T, Inami, K, Inguglia, G, Ishikawa, A, Iwasaki, M, Iwasaki, Y, Jacobs, W W., Jeon, H B., Jia, S, Joffe, D, Joo, K K., Kahn, J, Kaliyar, A B., Karyan, G, Kawasaki, T, Kichimi, H, Kiesling, C, Kim, D Y., Kim, H J., Kim, K T., Kim, S H., Kinoshita, Kay, Kodys, P, Korpar, S, Kotchetkov, Dmitri V., Krizan, P, Kroeger, Robert S., Krokovny, Pavel, Kulasiri, Ratnappuli H., Kumar, R, Kuzmin, A, Kwon, Y J., Lalwani, Kavita, Lange, J S., Lee, J.Y., Lee, S.C., Li, C.H., Li, L K., Li, Y.B., Li Gioi, L, Libby, J, Lieret, K., Liptak, Z, Liventsev, D, Lu, P C., Luo, T, Macnaughton, J, Masuda, M, Matsuda, T., Matvienko, D, Merola, M, Miyabayashi, K, Miyata, H, Mizuk, R, Mori, T, Mussa, R, Nakano, E, Nakao, M, Nath, K, Natkaniec, Z, Nayak, M, Niiyama, M, Nisar, N K., Nishida, S, Ogawa, S, Ono, H, Onuki, Y, Pakhlov, P, Pakhlova, G, Pal, Bilas K., Pardi, Silvio, Park, H, Park, S H., Patra, S, Paul, S, Pedlar, Todd, Pestotnik, R, Piilonen, Leo E., Popov, V, Prencipe, Elisabetta, Purohit, Milind V., Rostomyan, A, Russo, Guido, Sahoo, Dipankar, Sakai, Y, Salehi, M, Sandilya, S, Santelj, L, Sanuki, T, Savinov, Vladimir, Schneider, O, Schnell, G, Schueler, J, Schwanda, C, Seino, Y, Senyo, K, Seon, O, Sevior, ME, Shebalin, V., Shen, C P., Shiu, Jing-Ge, Shwartz, B, Simon, F, Singh, J B., Sokolov, A, Solovieva, E, Stanic, S, Staric, M, Stottler, Z.S., Strube, Jan F., Sumiyoshi, T, Takizawa, M, Tamponi, Umberto, Tanida, K, Tenchini, F, Trabelsi, K, Uchida, M, Uglov, T, Unno, Yuji, Uno, S, Urquijo, P, Usov, Y, Van Tonder, R, Varner, G, Vinokurova, A, Vorobyev, V, Vossen, Anselm G., Wang, B, Wang, C H., Wang, M Z., Wang, P, Watanuki, S, Won, E, Yang, S B., Ye, Hua, Yin, Junhao, Yuan, C Z., Yusa, Y, Zhang, Z P., Zhilich, V, & Zhukova, V. Observation of t- -> p- vte+ e- and search for t- -> p-vtµ+ µ-. United States. doi:10.1103/PhysRevD.100.071101.
Jin, Y, Aihara, H, Epifanov, D, Adachi, I, Al Said, S, Asner, David, Aulchenko, V, Aushev, T, Ayad, R, Babu, V, Badhrees, I, Bahinipati, S, Bansal, Vikas, Behera, P, Berger, M, Bhardwaj, V, Bilka, T, Biswal, J, Bobrov, A, Bonvicini, Giovanni, Bozek, A, Bracko, Marko, Campajola, M, Cao, Lu, Cervenkov, D, Chekelian, V, Chen, A, Cheon, B G., Chilikin, K, Cho, H.E., Cho, K, Choi, Y, Choudhury, S, Cinabro, David A., Cunliffe, Samuel T., Di Carlo, Salvatore, Dolezal, Z, Dong, Thanh V., Dossett, D, Eidelman, S, Fast, James E., Ferber, T, Fulsom, Bryan G., Garg, Renu, Gaur, Vipin, Gabyshev, N, Garmash, A, Giri, Anjan, Goldenzweig, P, Golob, B, Greenwald, D, Grzymkowska, O, Haba, J, Hayasaka, K, Hayashii, H, Hedges, Michael T., Hou, W S., Huang, K, Iijima, T, Inami, K, Inguglia, G, Ishikawa, A, Iwasaki, M, Iwasaki, Y, Jacobs, W W., Jeon, H B., Jia, S, Joffe, D, Joo, K K., Kahn, J, Kaliyar, A B., Karyan, G, Kawasaki, T, Kichimi, H, Kiesling, C, Kim, D Y., Kim, H J., Kim, K T., Kim, S H., Kinoshita, Kay, Kodys, P, Korpar, S, Kotchetkov, Dmitri V., Krizan, P, Kroeger, Robert S., Krokovny, Pavel, Kulasiri, Ratnappuli H., Kumar, R, Kuzmin, A, Kwon, Y J., Lalwani, Kavita, Lange, J S., Lee, J.Y., Lee, S.C., Li, C.H., Li, L K., Li, Y.B., Li Gioi, L, Libby, J, Lieret, K., Liptak, Z, Liventsev, D, Lu, P C., Luo, T, Macnaughton, J, Masuda, M, Matsuda, T., Matvienko, D, Merola, M, Miyabayashi, K, Miyata, H, Mizuk, R, Mori, T, Mussa, R, Nakano, E, Nakao, M, Nath, K, Natkaniec, Z, Nayak, M, Niiyama, M, Nisar, N K., Nishida, S, Ogawa, S, Ono, H, Onuki, Y, Pakhlov, P, Pakhlova, G, Pal, Bilas K., Pardi, Silvio, Park, H, Park, S H., Patra, S, Paul, S, Pedlar, Todd, Pestotnik, R, Piilonen, Leo E., Popov, V, Prencipe, Elisabetta, Purohit, Milind V., Rostomyan, A, Russo, Guido, Sahoo, Dipankar, Sakai, Y, Salehi, M, Sandilya, S, Santelj, L, Sanuki, T, Savinov, Vladimir, Schneider, O, Schnell, G, Schueler, J, Schwanda, C, Seino, Y, Senyo, K, Seon, O, Sevior, ME, Shebalin, V., Shen, C P., Shiu, Jing-Ge, Shwartz, B, Simon, F, Singh, J B., Sokolov, A, Solovieva, E, Stanic, S, Staric, M, Stottler, Z.S., Strube, Jan F., Sumiyoshi, T, Takizawa, M, Tamponi, Umberto, Tanida, K, Tenchini, F, Trabelsi, K, Uchida, M, Uglov, T, Unno, Yuji, Uno, S, Urquijo, P, Usov, Y, Van Tonder, R, Varner, G, Vinokurova, A, Vorobyev, V, Vossen, Anselm G., Wang, B, Wang, C H., Wang, M Z., Wang, P, Watanuki, S, Won, E, Yang, S B., Ye, Hua, Yin, Junhao, Yuan, C Z., Yusa, Y, Zhang, Z P., Zhilich, V, and Zhukova, V. Tue . "Observation of t- -> p- vte+ e- and search for t- -> p-vtµ+ µ-". United States. doi:10.1103/PhysRevD.100.071101.
@article{osti_1577438,
title = {Observation of t- -> p- vte+ e- and search for t- -> p-vtµ+ µ-},
author = {Jin, Y and Aihara, H and Epifanov, D and Adachi, I and Al Said, S and Asner, David and Aulchenko, V and Aushev, T and Ayad, R and Babu, V and Badhrees, I and Bahinipati, S and Bansal, Vikas and Behera, P and Berger, M and Bhardwaj, V and Bilka, T and Biswal, J and Bobrov, A and Bonvicini, Giovanni and Bozek, A and Bracko, Marko and Campajola, M and Cao, Lu and Cervenkov, D and Chekelian, V and Chen, A and Cheon, B G. and Chilikin, K and Cho, H.E. and Cho, K and Choi, Y and Choudhury, S and Cinabro, David A. and Cunliffe, Samuel T. and Di Carlo, Salvatore and Dolezal, Z and Dong, Thanh V. and Dossett, D and Eidelman, S and Fast, James E. and Ferber, T and Fulsom, Bryan G. and Garg, Renu and Gaur, Vipin and Gabyshev, N and Garmash, A and Giri, Anjan and Goldenzweig, P and Golob, B and Greenwald, D and Grzymkowska, O and Haba, J and Hayasaka, K and Hayashii, H and Hedges, Michael T. and Hou, W S. and Huang, K and Iijima, T and Inami, K and Inguglia, G and Ishikawa, A and Iwasaki, M and Iwasaki, Y and Jacobs, W W. and Jeon, H B. and Jia, S and Joffe, D and Joo, K K. and Kahn, J and Kaliyar, A B. and Karyan, G and Kawasaki, T and Kichimi, H and Kiesling, C and Kim, D Y. and Kim, H J. and Kim, K T. and Kim, S H. and Kinoshita, Kay and Kodys, P and Korpar, S and Kotchetkov, Dmitri V. and Krizan, P and Kroeger, Robert S. and Krokovny, Pavel and Kulasiri, Ratnappuli H. and Kumar, R and Kuzmin, A and Kwon, Y J. and Lalwani, Kavita and Lange, J S. and Lee, J.Y. and Lee, S.C. and Li, C.H. and Li, L K. and Li, Y.B. and Li Gioi, L and Libby, J and Lieret, K. and Liptak, Z and Liventsev, D and Lu, P C. and Luo, T and Macnaughton, J and Masuda, M and Matsuda, T. and Matvienko, D and Merola, M and Miyabayashi, K and Miyata, H and Mizuk, R and Mori, T and Mussa, R and Nakano, E and Nakao, M and Nath, K and Natkaniec, Z and Nayak, M and Niiyama, M and Nisar, N K. and Nishida, S and Ogawa, S and Ono, H and Onuki, Y and Pakhlov, P and Pakhlova, G and Pal, Bilas K. and Pardi, Silvio and Park, H and Park, S H. and Patra, S and Paul, S and Pedlar, Todd and Pestotnik, R and Piilonen, Leo E. and Popov, V and Prencipe, Elisabetta and Purohit, Milind V. and Rostomyan, A and Russo, Guido and Sahoo, Dipankar and Sakai, Y and Salehi, M and Sandilya, S and Santelj, L and Sanuki, T and Savinov, Vladimir and Schneider, O and Schnell, G and Schueler, J and Schwanda, C and Seino, Y and Senyo, K and Seon, O and Sevior, ME and Shebalin, V. and Shen, C P. and Shiu, Jing-Ge and Shwartz, B and Simon, F and Singh, J B. and Sokolov, A and Solovieva, E and Stanic, S and Staric, M and Stottler, Z.S. and Strube, Jan F. and Sumiyoshi, T and Takizawa, M and Tamponi, Umberto and Tanida, K and Tenchini, F and Trabelsi, K and Uchida, M and Uglov, T and Unno, Yuji and Uno, S and Urquijo, P and Usov, Y and Van Tonder, R and Varner, G and Vinokurova, A and Vorobyev, V and Vossen, Anselm G. and Wang, B and Wang, C H. and Wang, M Z. and Wang, P and Watanuki, S and Won, E and Yang, S B. and Ye, Hua and Yin, Junhao and Yuan, C Z. and Yusa, Y and Zhang, Z P. and Zhilich, V and Zhukova, V},
abstractNote = {We present the first measurements of branching fractions of rare tau-lepton decays, t- ? p-?tlþl-(l ¼ e or µ), using a data sample corresponding to 562 fb-1 collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy eþe- collider. The t- ? p-?teþe-decay is observed for the first time with 7.0s significance. The partial branching fraction determined by the structure-dependent mechanisms mediated by either a vector or an axial-vector current for the mass region Mpee > 1.05 GeV=c2 is measured to be Bðt- ? p-?teþe-Þ½Mp-eþe- > 1.05 GeV=c2_ ¼ ð5.90 _ 0.53 _ 0.85 _ 0.11Þ × 10-6, where the first uncertainty is statistical, the second is systematic, and the third is due to model dependence. In the full phase space, due to the different detection efficiencies for the structure-dependent mechanisms mediated by axial-vector and vector currents, the branching fraction varies from BAðt- ? p-?teþe-Þ ¼ ð1.46 _ 0.13 _ 0.21Þ × 10-5 to BVðt- ? p-?teþe-Þ ¼ ð3.01 _ 0.27 _ 0.43Þ × 10-5, respectively. An upper limit is set on the branching fraction of the t- ? p-?tµþµ- decay, Bðt- ? p-?tµþµ-Þ < 1.14 × 10-5, at the 90% confidence level.},
doi = {10.1103/PhysRevD.100.071101},
journal = {Physical Review D},
number = 7,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

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