Search for the Decay B^{+}→K^{+}τ^{+}τ^{-} Using Data from the Belle and Belle II Experiments.

Authors

M Abumusabh, I Adachi, K Adamczyk, A Aggarwal, L Aggarwal, H Ahmed, Y Ahn, H Aihara, N Akopov, S Alghamdi, M Alhakami, A Aloisio, N Althubiti, K Amos, M Angelsmark, N Anh Ky, C Antonioli, D M Asner, H Atmacan, T Aushev, R Ayad, V Babu, H Bae, N K Baghel, S Bahinipati, P Bambade, Sw Banerjee, M Barrett, M Bartl, J Baudot, A Baur, A Beaubien, F Becherer, J Becker, J V Bennett, F U Bernlochner, V Bertacchi, M Bertemes, E Bertholet, M Bessner, S Bettarini, V Bhardwaj, F Bianchi, T Bilka, D Biswas, A Bobrov, D Bodrov, A Bondar, G Bonvicini, J Borah, A Boschetti, A Bozek, M Bračko, P Branchini, R A Briere, T E Browder, A Budano, S Bussino, Q Campagna, M Campajola, L Cao, G Casarosa, C Cecchi, M-C Chang, P Chang, P Cheema, L Chen, B G Cheon, C Cheshta, H Chetri, K Chilikin, K Chirapatpimol, H-E Cho, K Cho, S-J Cho, S-K Choi, S Choudhury, S Chutia, J Cochran, J A Colorado-Caicedo, I Consigny, L Corona, J X Cui, E De La Cruz-Burelo, S A De La Motte, G de Marino, G De Nardo, G De Pietro, R de Sangro, M Destefanis, S Dey, R Dhayal, A Di Canto, J Dingfelder, Z Doležal, I Domínguez Jiménez, T V Dong, X Dong, M Dorigo, K Dugic, G Dujany, P Ecker, J Eppelt, R Farkas, T Ferber, T Fillinger, C Finck, G Finocchiaro, F Forti, A Frey, B G Fulsom, A Gabrielli, A Gale, E Ganiev, M Garcia-Hernandez, R Garg, L Gärtner, G Gaudino, V Gaur, V Gautam, A Gaz, A Gellrich, G Ghevondyan, D Ghosh, R Giordano, A Giri, P Gironella Gironell, A Glazov, B Gobbo, R Godang, O Gogota, P Goldenzweig, W Gradl, E Graziani, D Greenwald, Y Guan, K Gudkova, I Haide, H Haigh, Y Han, H Hayashii, S Hazra, C Hearty, M T Hedges, A Heidelbach, G Heine, I Heredia de la Cruz, M Hernández Villanueva, T Higuchi, M Hoek, M Hohmann, R Hoppe, P Horak, X T Hou, C-L Hsu, T Humair, T Iijima, K Inami, G Inguglia, N Ipsita, A Ishikawa, R Itoh, M Iwasaki, P Jackson, D Jacobi, W W Jacobs, E-J Jang, Q P Ji, S Jia, Y Jin, A Johnson, J Kandra, K H Kang, S Kang, G Karyan, F Keil, C Ketter, C Kiesling, C Kim, D Y Kim, H Kim, J-Y Kim, K-H Kim, H Kindo, K Kinoshita, P Kodyš, T Koga, S Kohani, A Korobov, S Korpar, E Kovalenko, R Kowalewski, P Križan, P Krokovny, T Kuhr, Y Kulii, D Kumar, J Kumar, R Kumar, K Kumara, T Kunigo, A Kuzmin, Y-J Kwon, S Lacaprara, T Lam, L Lanceri, J S Lange, T S Lau, M Laurenza, R Leboucher, F R Le Diberder, H Lee, M J Lee, C Lemettais, P Leo, P M Lewis, C Li, H-J Li, L K Li, Q M Li, W Z Li, Y Li, Y B Li, Y P Liao, J Libby, J Lin, S Lin, Z Liptak, V Lisovskyi, M H Liu, Q Y Liu, Y Liu, Z Q Liu, D Liventsev, S Longo, A Lozar, T Lueck, C Lyu, J L Ma, Y Ma, M Maggiora, S P Maharana, R Maiti, G Mancinelli, R Manfredi, E Manoni, M Mantovano, D Marcantonio, S Marcello, M Marfoli, C Marinas, C Martellini, A Martens, T Martinov, L Massaccesi, M Masuda, D Matvienko, S K Maurya, M Maushart, J A McKenna, Z Mediankin Gruberová, R Mehta, F Meier, D Meleshko, M Merola, C Miller, M Mirra, K Miyabayashi, H Miyake, R Mizuk, G B Mohanty, S Moneta, A L Moreira de Carvalho, H-G Moser, Th Muller, R Mussa, I Nakamura, M Nakao, Y Nakazawa, M Naruki, Z Natkaniec, A Natochii, M Nayak, M Neu, M Niiyama, S Nishida, R Nomaru, S Ogawa, R Okubo, H Ono, Y Onuki, F Otani, P Pakhlov, G Pakhlova, A Panta, S Pardi, K Parham, J Park, K Park, S-H Park, A Passeri, S Patra, S Paul, T K Pedlar, R Pestotnik, M Piccolo, L E Piilonen, P L M Podesta-Lerma, T Podobnik, A Prakash, C Praz, S Prell, E Prencipe, M T Prim, S Privalov, I Prudiiev, H Purwar, P Rados, S Raiz, K Ravindran, J U Rehman, M Reif, S Reiter, L Reuter, D Ricalde Herrmann, I Ripp-Baudot, G Rizzo, S H Robertson, J M Roney, A Rostomyan, N Rout, S Saha, L Salutari, D A Sanders, S Sandilya, L Santelj, C Santos, V Savinov, B Scavino, C Schmitt, S Schneider, G Schnell, K Schoenning, C Schwanda, A J Schwartz, Y Seino, K Senyo, J Serrano, M E Sevior, C Sfienti, W Shan, G Sharma, C P Shen, X D Shi, T Shillington, T Shimasaki, J-G Shiu, D Shtol, B Shwartz, A Sibidanov, F Simon, J Skorupa, R J Sobie, M Sobotzik, A Soffer, A Sokolov, E Solovieva, W Song, S Spataro, K Špenko, B Spruck, M Starič, P Stavroulakis, S Stefkova, R Stroili, J Strube, M Sumihama, N Suwonjandee, M Takahashi, M Takizawa, S S Tang, K Tanida, F Tenchini, F Testa, A Thaller, T Tien Manh, O Tittel, R Tiwary, D Tonelli, E Torassa, K Trabelsi, F F Trantou, I Tsaklidis, I Ueda, T Uglov, K Unger, Y Unno, K Uno, S Uno, P Urquijo, Y Ushiroda, S E Vahsen, R van Tonder, K E Varvell, M Veronesi, V S Vismaya, L Vitale, V Vobbilisetti, R Volpe, M Wakai, S Wallner, M-Z Wang, A Warburton, M Watanabe, S Watanuki, C Wessel, E Won, X P Xu, B D Yabsley, W Yan, W Yan, J Yelton, K Yi, J H Yin, K Yoshihara, J Yuan, Y Yusa, L Zani, F Zeng, M Zeyrek, B Zhang, V Zhilich, J S Zhou, Q D Zhou, L Zhu, R Žlebčík, Belle and Belle II Collaborations

Published in

Physical review letters. Volume 137. Issue 5. Pages 051805. Jul 31, 2026.

Abstract

We report a search for the rare decay B^{+}→K^{+}τ^{+}τ^{-} using 1.2×10^{9}  ϒ(4S) mesons produced near threshold in electron-positron collisions and collected by the Belle and Belle II experiments. We fully reconstruct the hadronic decay of one B meson produced in the ϒ(4S)→B^{+}B^{-} decay, and search for B^{±}→K^{±}τ^{+}τ^{-} candidates among the remaining collision products, reconstructing a charged kaon and leptonic decays of the τ leptons. We optimize the selection for best sensitivity and look for an excess over background at low values of the residual energy detected in the calorimeter after full event reconstruction. We observe no significant excess and set the limit B(B^{+}→K^{+}τ^{+}τ^{-})<0.56×10^{-3} at the 90% confidence level, improving on the only previous result by a factor of four.

PMID:
42606420
Bibliographic data and abstract were imported from PubMed on 17 Aug 2026.

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