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An improved search for the electric dipole moment of the τ lepton

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Authors

Inami, K.; Hayasaka, K.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Bahinipati, S.; Behera, P.; Bessner, M.; Bhuyan, B.; Bilka, T.; Biswal, J.; Bobrov, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Campajola, M.; Červenkov, D.; Cheon, B. G.; Chilikin, K.; Cho, H. E.; Cho, K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Das, S.; De Nardo, G.; Dhamija, R.; Di Capua, F.; Doležal, Z.; Dong, T. V.; Dubey, S.; Eidelman, S.; Epifanov, D.; Ferber, T.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Giri, A.; Goldenzweig, P.; Golob, B.; Greenwald, D.; Gudkova, K.; Hadjivasiliou, C.; Hartbrich, O.; Hayashii, H.; Hedges, M. T.; Hou, W.-S.; Hsu, C.-L.; Iijima, T.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W. W.; Jang, E.-J.; Jin, Y.; Joo, C. W.; Joo, K. K.; Kato, Y.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, S. H.; Kim, Y.-K.; Kimmel, T. D.; Kinoshita, K.; Kodyš, P.; Konno, T.; Korpar, S.; Križan, P.; Kroeger, R.; Krokovny, P.; Kulasiri, R.; Kumar, M.; Kumar, R.; Kumara, K.; Kwon, Y.-J.; Lalwani, K.; Lange, J. S.; Lee, S. C.; Li, C. H.; Li, J.; Li, L. K.; Li, Y. B.; Gioi, L. L.; Libby, J.; Liventsev, D.; MacQueen, C.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Metzner, F.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Mohanty, S.; Moon, T. J.; Nakao, M.; Natochii, A.; Nayak, L.; Nayak, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, S.-H.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Popov, V.; Prencipe, E.; Prim, M. T.; Rabusov, A.; Röhrken, M.; Rostomyan, A.; Rout, N.; Russo, G.; Sahoo, D.; Sandilya, S.; Sangal, A.; Santelj, L.; Sanuki, T.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Sharma, C.; Shiu, J.-G.; Shwartz, B.; Simon, F.; Solovieva, E.; Starič, M.; Stottler, Z. S.; Strube, J. F.; Sumisawa, K.; Sutcliffe, W.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tao, Y.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uehara, S.; Uno, S.; Ushiroda, Y.; Van Tonder, R.; Varner, G.; Vinokurova, A.; Wang, C. H.; Wang, E.; Wang, P.; Watanabe, M.; Watanuki, S.; Won, E.; Xu, X.; Yabsley, B. D.; Yan, W.; Yang, S. B.; Ye, H.; Yin, J. H.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.

Issue Date
2022-04-20
Citation
Journal of High Energy Physics. 2022 Apr 20;2022(4):110
Keywords
e+-e− ExperimentsTau Physics
Abstract
We report a measurement of the electric dipole moment of the τ lepton (dτ) using an 833 fb−1 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) × 10−17 ecm and Im(dτ) = (−0.40 ± 0.32) × 10−17 ecm, 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.
ISSN
1029-8479
Language
English
URI
https://hdl.handle.net/10371/179828
DOI
https://doi.org/10.1007/JHEP04(2022)110
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