Abstract

We report a measurement of the electric dipole moment of the τ lepton () using an 833 fb1 data sample collected near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e collider. Using an optimal observable method, we obtain the real and imaginary parts of dτ as Re(dτ) = (0.62 ± 0.63) × 1017ecm and Im(dτ) = (0.40 ± 0.32) × 1017ecm, respectively. These results are consistent with null electric dipole moment at the present level of experimental sensitivity and improve the sensitivity by about a factor of three.

Details

Title
An improved search for the electric dipole moment of the τ lepton
Author
Inami, K. 1 ; Hayasaka, K. 2 ; Adachi, I. 3 ; Aihara, H. 4 ; Al Said, S. 5 ; Asner, D. M. 6 ; Aulchenko, V. 7 ; Aushev, T. 8 ; Ayad, R. 9 ; Babu, V. 10 ; Bahinipati, S. 11 ; Behera, P. 12 ; Bessner, M. 13 ; Bhuyan, B. 14 ; Bilka, T. 15 ; Biswal, J. 16 ; Bobrov, A. 7 ; Bonvicini, G. 17 ; Bozek, A. 18 ; Bračko, M. 19 ; Browder, T. E. 13 ; Campajola, M. 20 ; Červenkov, D. 15 ; Cheon, B. G. 21 ; Chilikin, K. 22 ; Cho, H. E. 21 ; Cho, K. 23 ; Choi, Y. 24 ; Choudhury, S. 25 ; Cinabro, D. 17 ; Cunliffe, S. 10 ; Das, S. 26 ; De Nardo, G. 20 ; Dhamija, R. 25 ; Di Capua, F. 20 ; Doležal, Z. 15 ; Dong, T. V. 27 ; Dubey, S. 13 ; Eidelman, S. 28 ; Epifanov, D. 7 ; Ferber, T. 10 ; Fulsom, B. G. 29 ; Garg, R. 30 ; Gaur, V. 31 ; Gabyshev, N. 7 ; Garmash, A. 7 ; Giri, A. 25 ; Goldenzweig, P. 32 ; Golob, B. 33 ; Greenwald, D. 34 ; Gudkova, K. 7 ; Hadjivasiliou, C. 29 ; Hartbrich, O. 13 ; Hayashii, H. 35 ; Hedges, M. T. 13 ; Hou, W.-S. 36 ; Hsu, C.-L. 37 ; Iijima, T. 38 ; Inguglia, G. 39 ; Ishikawa, A. 3 ; Itoh, R. 3 ; Iwasaki, M. 40 ; Iwasaki, Y. 41 ; Jacobs, W. W. 42 ; Jang, E.-J. 43 ; Jin, Y. 4 ; Joo, C. W. 44 ; Joo, K. K. 45 ; Kato, Y. 1 ; Kawasaki, T. 46 ; Kichimi, H. 41 ; Kiesling, C. 47 ; Kim, C. H. 21 ; Kim, D. Y. 48 ; Kim, S. H. 49 ; Kim, Y.-K. 50 ; Kimmel, T. D. 31 ; Kinoshita, K. 51 ; Kodyš, P. 15 ; Konno, T. 46 ; Korpar, S. 19 ; Križan, P. 33 ; Kroeger, R. 52 ; Krokovny, P. 7 ; Kulasiri, R. 53 ; Kumar, M. 26 ; Kumar, R. 54 ; Kumara, K. 17 ; Kwon, Y.-J. 50 ; Lalwani, K. 26 ; Lange, J. S. 55 ; Lee, S. C. 56 ; Li, C. H. 57 ; Li, J. 56 ; Li, L. K. 51 ; Li, Y. B. 58 ; Gioi, L. Li 47 ; Libby, J. 12 ; Liventsev, D. 59 ; MacQueen, C. 60 ; Masuda, M. 61 ; Matsuda, T. 62 ; Matvienko, D. 28 ; Merola, M. 20 ; Metzner, F. 32 ; Miyabayashi, K. 35 ; Mizuk, R. 63 ; Mohanty, G. B. 64 ; Mohanty, S. 65 ; Moon, T. J. 49 ; Nakao, M. 3 ; Natochii, A. 13 ; Nayak, L. 25 ; Nayak, M. 66 ; Nisar, N. K. 6 ; Nishida, S. 3 ; Ogawa, S. 67 ; Ono, H. 68 ; Onuki, Y. 4 ; Oskin, P. 22 ; Pakhlov, P. 69 ; Pakhlova, G. 70 ; Pardi, S. 71 ; Park, S.-H. 50 ; Paul, S. 72 ; Pedlar, T. K. 73 ; Pestotnik, R. 16 ; Piilonen, L. E. 31 ; Podobnik, T. 33 ; Popov, V. 8 ; Prencipe, E. 74 ; Prim, M. T. 32 ; Rabusov, A. 34 ; Röhrken, M. 10 ; Rostomyan, A. 10 ; Rout, N. 12 ; Russo, G. 75 ; Sahoo, D. 64 ; Sandilya, S. 25 ; Sangal, A. 51 ; Santelj, L. 33 ; Sanuki, T. 76 ; Savinov, V. 77 ; Schnell, G. 78 ; Schwanda, C. 39 ; Seino, Y. 2 ; Senyo, K. 79 ; Sevior, M. E. 60 ; Shapkin, M. 80 ; Sharma, C. 26 ; Shiu, J.-G. 36 ; Shwartz, B. 7 ; Simon, F. 47 ; Solovieva, E. 22 ; Starič, M. 16 ; Stottler, Z. S. 31 ; Strube, J. F. 29 ; Sumisawa, K. 3 ; Sutcliffe, W. 81 ; Takizawa, M. 82 ; Tamponi, U. 83 ; Tanida, K. 84 ; Tao, Y. 85 ; Tenchini, F. 10 ; Trabelsi, K. 86 ; Uchida, M. 87 ; Uehara, S. 3 ; Uno, S. 3 ; Ushiroda, Y. 3 ; Van Tonder, R. 81 ; Varner, G. 13 ; Vinokurova, A. 7 ; Wang, C. H. 88 ; Wang, E. 77 ; Wang, P. 89 ; Watanabe, M. 2 ; Watanuki, S. 86 ; Won, E. 90 ; Xu, X. 91 ; Yabsley, B. D. 37 ; Yan, W. 92 ; Yang, S. B. 90 ; Ye, H. 10 ; Yin, J. H. 90 ; Yusa, Y. 2 ; Zhang, Z. P. 92 ; Zhilich, V. 7 ; Zhukova, V. 22 

 Nagoya University, Graduate School of Science, Nagoya, Japan (GRID:grid.27476.30) (ISNI:0000 0001 0943 978X) 
 Niigata University, Niigata, Japan (GRID:grid.260975.f) (ISNI:0000 0001 0671 5144) 
 High Energy Accelerator Research Organization (KEK), Tsukuba, Japan (GRID:grid.410794.f) (ISNI:0000 0001 2155 959X); SOKENDAI (The Graduate University for Advanced Studies), Hayama, Japan (GRID:grid.275033.0) (ISNI:0000 0004 1763 208X) 
 University of Tokyo, Department of Physics, Tokyo, Japan (GRID:grid.26999.3d) (ISNI:0000 0001 2151 536X) 
 University of Tabuk, Department of Physics, Faculty of Science, Tabuk, Saudi Arabia (GRID:grid.440760.1) (ISNI:0000 0004 0419 5685); King Abdulaziz University, Department of Physics, Faculty of Science, Jeddah, Saudi Arabia (GRID:grid.412125.1) (ISNI:0000 0001 0619 1117) 
 Brookhaven National Laboratory, Upton, U.S.A. (GRID:grid.202665.5) (ISNI:0000 0001 2188 4229) 
 Budker Institute of Nuclear Physics SB RAS, Novosibirsk, Russian Federation (GRID:grid.418495.5) (ISNI:0000 0001 0790 5468); Novosibirsk State University, Novosibirsk, Russian Federation (GRID:grid.4605.7) (ISNI:0000000121896553) 
 Higher School of Economics (HSE), Moscow, Russian Federation (GRID:grid.410682.9) (ISNI:0000 0004 0578 2005) 
 University of Tabuk, Department of Physics, Faculty of Science, Tabuk, Saudi Arabia (GRID:grid.440760.1) (ISNI:0000 0004 0419 5685) 
10  Deutsches Elektronen-Synchrotron, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453) 
11  Indian Institute of Technology Bhubaneswar, Satya Nagar, India (GRID:grid.459611.e) (ISNI:0000 0004 1774 3038) 
12  Indian Institute of Technology Madras, Chennai, India (GRID:grid.417969.4) (ISNI:0000 0001 2315 1926) 
13  University of Hawaii, Honolulu, U.S.A. (GRID:grid.410445.0) (ISNI:0000 0001 2188 0957) 
14  Indian Institute of Technology Guwahati, Assam, India (GRID:grid.417972.e) (ISNI:0000 0001 1887 8311) 
15  Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic (GRID:grid.4491.8) (ISNI:0000 0004 1937 116X) 
16  J. Stefan Institute, Ljubljana, Slovenia (GRID:grid.11375.31) (ISNI:0000 0001 0706 0012) 
17  Wayne State University, Detroit, U.S.A. (GRID:grid.254444.7) (ISNI:0000 0001 1456 7807) 
18  H. Niewodniczanski Institute of Nuclear Physics, Krakow, Poland (GRID:grid.418860.3) (ISNI:0000 0001 0942 8941) 
19  University of Maribor, Faculty of Chemistry and Chemical Engineering, Maribor, Slovenia (GRID:grid.8647.d) (ISNI:0000 0004 0637 0731) 
20  INFN — Sezione di Napoli, Napoli, Italy (GRID:grid.470211.1) (ISNI:0000 0004 8343 7696); Università di Napoli Federico II, Napoli, Italy (GRID:grid.4691.a) (ISNI:0000 0001 0790 385X) 
21  Hanyang University, Department of Physics and Institute of Natural Sciences, Seoul, South Korea (GRID:grid.49606.3d) (ISNI:0000 0001 1364 9317) 
22  P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russian Federation (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476) 
23  Korea Institute of Science and Technology Information, Daejeon, South Korea (GRID:grid.249964.4) (ISNI:0000 0001 0523 5253) 
24  Sungkyunkwan University, Suwon, South Korea (GRID:grid.264381.a) (ISNI:0000 0001 2181 989X) 
25  Indian Institute of Technology Hyderabad, Telangana, India (GRID:grid.459612.d) (ISNI:0000 0004 1767 065X) 
26  Malaviya National Institute of Technology Jaipur, Jaipur, India (GRID:grid.444471.6) (ISNI:0000 0004 1764 2536) 
27  Fudan University, Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Shanghai, P.R. China (GRID:grid.8547.e) (ISNI:0000 0001 0125 2443) 
28  Budker Institute of Nuclear Physics SB RAS, Novosibirsk, Russian Federation (GRID:grid.418495.5) (ISNI:0000 0001 0790 5468); Novosibirsk State University, Novosibirsk, Russian Federation (GRID:grid.4605.7) (ISNI:0000000121896553); P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russian Federation (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476) 
29  Pacific Northwest National Laboratory, Richland, U.S.A. (GRID:grid.451303.0) (ISNI:0000 0001 2218 3491) 
30  Panjab University, Chandigarh, India (GRID:grid.261674.0) (ISNI:0000 0001 2174 5640) 
31  Virginia Polytechnic Institute and State University, Blacksburg, U.S.A. (GRID:grid.438526.e) (ISNI:0000 0001 0694 4940) 
32  Karlsruher Institut für Technologie, Institut für Experimentelle Teilchenphysik, Karlsruhe, Germany (GRID:grid.7892.4) (ISNI:0000 0001 0075 5874) 
33  University of Ljubljana, Faculty of Mathematics and Physics, Ljubljana, Slovenia (GRID:grid.8954.0) (ISNI:0000 0001 0721 6013); J. Stefan Institute, Ljubljana, Slovenia (GRID:grid.11375.31) (ISNI:0000 0001 0706 0012) 
34  Technische Universität München, Department of Physics, Garching, Germany (GRID:grid.6936.a) (ISNI:0000000123222966) 
35  Nara Women’s University, Nara, Japan (GRID:grid.174568.9) (ISNI:0000 0001 0059 3836) 
36  National Taiwan University, Department of Physics, Taipei, Taiwan (GRID:grid.19188.39) (ISNI:0000 0004 0546 0241) 
37  University of Sydney, School of Physics, Sydney, Australia (GRID:grid.1013.3) (ISNI:0000 0004 1936 834X) 
38  Nagoya University, Kobayashi-Maskawa Institute, Nagoya, Japan (GRID:grid.27476.30) (ISNI:0000 0001 0943 978X); Nagoya University, Graduate School of Science, Nagoya, Japan (GRID:grid.27476.30) (ISNI:0000 0001 0943 978X) 
39  Institute of High Energy Physics, Vienna, Austria (GRID:grid.450258.e) (ISNI:0000 0004 0625 7405) 
40  Osaka City University, Osaka, Japan (GRID:grid.261445.0) (ISNI:0000 0001 1009 6411) 
41  High Energy Accelerator Research Organization (KEK), Tsukuba, Japan (GRID:grid.410794.f) (ISNI:0000 0001 2155 959X) 
42  Indiana University, Bloomington, U.S.A. (GRID:grid.411377.7) (ISNI:0000 0001 0790 959X) 
43  Gyeongsang National University, Jinju, South Korea (GRID:grid.256681.e) (ISNI:0000 0001 0661 1492) 
44  University of Tokyo, Kavli Institute for the Physics and Mathematics of the Universe (WPI), Kashiwa, Japan (GRID:grid.26999.3d) (ISNI:0000 0001 2151 536X) 
45  Chonnam National University, Gwangju, South Korea (GRID:grid.14005.30) (ISNI:0000 0001 0356 9399) 
46  Kitasato University, Sagamihara, Japan (GRID:grid.410786.c) (ISNI:0000 0000 9206 2938) 
47  Max-Planck-Institut für Physik, München, Germany (GRID:grid.435824.c) (ISNI:0000 0001 2375 0603) 
48  Soongsil University, Seoul, South Korea (GRID:grid.263765.3) (ISNI:0000 0004 0533 3568) 
49  Seoul National University, Seoul, South Korea (GRID:grid.31501.36) (ISNI:0000 0004 0470 5905) 
50  Yonsei University, Seoul, South Korea (GRID:grid.15444.30) (ISNI:0000 0004 0470 5454) 
51  University of Cincinnati, Cincinnati, U.S.A. (GRID:grid.24827.3b) (ISNI:0000 0001 2179 9593) 
52  University of Mississippi, University, U.S.A. (GRID:grid.251313.7) (ISNI:0000 0001 2169 2489) 
53  Kennesaw State University, Kennesaw, U.S.A. (GRID:grid.258509.3) (ISNI:0000 0000 9620 8332) 
54  Punjab Agricultural University, Ludhiana, India (GRID:grid.412577.2) (ISNI:0000 0001 2176 2352) 
55  Justus-Liebig-Universität Gießen, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000 0001 2165 8627) 
56  Kyungpook National University, Daegu, South Korea (GRID:grid.258803.4) (ISNI:0000 0001 0661 1556) 
57  Liaoning Normal University, Dalian, P.R. China (GRID:grid.440818.1) (ISNI:0000 0000 8664 1765) 
58  Peking University, Beijing, P.R. China (GRID:grid.11135.37) (ISNI:0000 0001 2256 9319) 
59  Wayne State University, Detroit, U.S.A. (GRID:grid.254444.7) (ISNI:0000 0001 1456 7807); High Energy Accelerator Research Organization (KEK), Tsukuba, Japan (GRID:grid.410794.f) (ISNI:0000 0001 2155 959X) 
60  University of Melbourne, School of Physics, Melbourne, Australia (GRID:grid.1008.9) (ISNI:0000 0001 2179 088X) 
61  University of Tokyo, Earthquake Research Institute, Tokyo, Japan (GRID:grid.26999.3d) (ISNI:0000 0001 2151 536X); Osaka University, Research Center for Nuclear Physics, Osaka, Japan (GRID:grid.136593.b) (ISNI:0000 0004 0373 3971) 
62  University of Miyazaki, Miyazaki, Japan (GRID:grid.410849.0) (ISNI:0000 0001 0657 3887) 
63  P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russian Federation (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476); Higher School of Economics (HSE), Moscow, Russian Federation (GRID:grid.410682.9) (ISNI:0000 0004 0578 2005) 
64  Tata Institute of Fundamental Research, Mumbai, India (GRID:grid.22401.35) (ISNI:0000 0004 0502 9283) 
65  Tata Institute of Fundamental Research, Mumbai, India (GRID:grid.22401.35) (ISNI:0000 0004 0502 9283); Utkal University, Bhubaneswar, India (GRID:grid.412779.e) (ISNI:0000 0001 2334 6133) 
66  Tel Aviv University, School of Physics and Astronomy, Tel Aviv, Israel (GRID:grid.12136.37) (ISNI:0000 0004 1937 0546) 
67  Toho University, Funabashi, Japan (GRID:grid.265050.4) (ISNI:0000 0000 9290 9879) 
68  Nippon Dental University, Niigata, Japan (GRID:grid.412196.9) (ISNI:0000 0001 2293 6406); Niigata University, Niigata, Japan (GRID:grid.260975.f) (ISNI:0000 0001 0671 5144) 
69  P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russian Federation (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476); Moscow Physical Engineering Institute, Moscow, Russian Federation (GRID:grid.183446.c) (ISNI:0000 0000 8868 5198) 
70  Higher School of Economics (HSE), Moscow, Russian Federation (GRID:grid.410682.9) (ISNI:0000 0004 0578 2005); P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russian Federation (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476) 
71  INFN — Sezione di Napoli, Napoli, Italy (GRID:grid.470211.1) (ISNI:0000 0004 8343 7696) 
72  Technische Universität München, Department of Physics, Garching, Germany (GRID:grid.6936.a) (ISNI:0000000123222966); Max-Planck-Institut für Physik, München, Germany (GRID:grid.435824.c) (ISNI:0000 0001 2375 0603) 
73  Luther College, Decorah, U.S.A. (GRID:grid.2294.d) (ISNI:0000 0004 0394 7857) 
74  Forschungszentrum Jülich, Jülich, Germany (GRID:grid.8385.6) (ISNI:0000 0001 2297 375X) 
75  Università di Napoli Federico II, Napoli, Italy (GRID:grid.4691.a) (ISNI:0000 0001 0790 385X) 
76  Tohoku University, Department of Physics, Sendai, Japan (GRID:grid.69566.3a) (ISNI:0000 0001 2248 6943) 
77  University of Pittsburgh, Pittsburgh, U.S.A. (GRID:grid.21925.3d) (ISNI:0000 0004 1936 9000) 
78  University of the Basque Country UPV/EHU, Bilbao, Spain (GRID:grid.11480.3c) (ISNI:0000000121671098); IKERBASQUE, Basque Foundation for Science, Bilbao, Spain (GRID:grid.424810.b) (ISNI:0000 0004 0467 2314) 
79  Yamagata University, Yamagata, Japan (GRID:grid.268394.2) (ISNI:0000 0001 0674 7277) 
80  Institute for High Energy Physics, Protvino, Russian Federation (GRID:grid.424823.b) (ISNI:0000 0004 0620 440X) 
81  University of Bonn, Bonn, Germany (GRID:grid.10388.32) (ISNI:0000 0001 2240 3300) 
82  Showa Pharmaceutical University, Tokyo, Japan (GRID:grid.412579.c) (ISNI:0000 0001 2180 2836); J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan (GRID:grid.410794.f) (ISNI:0000 0001 2155 959X); Meson Science Laboratory, Cluster for Pioneering Research, RIKEN, Saitama, Japan (GRID:grid.7597.c) (ISNI:0000000094465255) 
83  INFN — Sezione di Torino, Torino, Italy (GRID:grid.470222.1) (ISNI:0000 0004 7471 9712) 
84  Japan Atomic Energy Agency, Advanced Science Research Center, Naka, Japan (GRID:grid.20256.33) (ISNI:0000 0001 0372 1485) 
85  University of Florida, Gainesville, U.S.A. (GRID:grid.15276.37) (ISNI:0000 0004 1936 8091) 
86  Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France (GRID:grid.508754.b) 
87  Tokyo Institute of Technology, Tokyo, Japan (GRID:grid.32197.3e) (ISNI:0000 0001 2179 2105) 
88  National United University, Miao Li, Taiwan (GRID:grid.412103.5) (ISNI:0000 0004 0622 7206) 
89  Chinese Academy of Sciences, Institute of High Energy Physics, Beijing, P.R. China (GRID:grid.9227.e) (ISNI:0000000119573309) 
90  Korea University, Seoul, South Korea (GRID:grid.222754.4) (ISNI:0000 0001 0840 2678) 
91  Soochow University, Suzhou, P.R. China (GRID:grid.263761.7) (ISNI:0000 0001 0198 0694) 
92  University of Science and Technology of China, Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, Hefei, P.R. China (GRID:grid.59053.3a) (ISNI:0000000121679639) 
Pages
110
Publication year
2022
Publication date
Apr 2022
Publisher
Springer Nature B.V.
e-ISSN
10298479
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2653413862
Copyright
© The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.