Measurement of time-dependent CP asymmetries in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays at Belle and Belle II

A bstract We present a measurement of the time-dependent CP asymmetry in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays using a data set of 365 fb − 1 recorded by the Belle II experiment and the final data set of 711 fb − 1 recorded by the Belle experiment at the Υ(4S) resonance. The direct and mixing-induced time-dependent CP violation parameters C and S are determined along with two additional quantities, S + and S − , defined in the two halves of the $${m}^{2}\left({K}_{\text{S}}^{0}{\pi }^{+}\right)-{m}^{2}\left({K}_{\text{S}}^{0}{\pi }^{-}\right)$$ plane. The measured values are C = − 0 . 17 ± 0 . 09 ± 0 . 04, S = − 0 . 29 ± 0 . 11 ± 0 . 05, S + = −0 . 57 ± 0 . 23 ± 0 . 10 and S − = 0 . 31 ± 0 . 24 ± 0 . 05, where the first uncertainty is statistical and the second systematic.

Authors

Institutions

Publication Details

Journal
Journal of High Energy Physics
Published
2026-01-21
DOI
https://doi.org/10.1007/jhep01(2026)134
Primary Topic
Particle physics theoretical and experimental studies
Type
article
Field-Weighted Citation Impact
0.00

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Measurement of time-dependent CP asymmetries in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays at Belle and Belle II

R. Ayad, T. Lam, C. Cecchi, T. E. Browder et al.
Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

Measurement of time-dependent CP asymmetries in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays at Belle and Belle II

R. Ayad, T. Lam, C. Cecchi, T. E. Browder, Q. M. Li, P. Ecker, S. Pardi, M. Hohmann, G. Dujany, Z. Gruberová, C. Z. Yuan, D. Ricalde Herrmann, M. Alhakami, B. Zhang, C. Li, S. Longo, M. Garcia-Hernandez, C. Schwanda, G. Mancinelli, R. Volpe, Renu Garg, M. Maggiora, Z. Liptak, W. Gradl, G. Gaudino, M. Neu, T. Bilka, S. Patra, B. Spruck, S. A. Al‐Ghamdi, H. Ghumaryan, A. L. Moreira De Carvalho, Y. Han, S. Paul, J. Libby, A. Ishikawa, Shoichi Watanuki, Y. Jin, D. Marcantonio, J. V. Bennett, A. Soffer, S. Moneta, S. Hazra, K. Chirapatpimol, H. Chetri, H. Aihara, C. Lyu, J. X. Cui, S. A. De La Motte, V. S. Vismaya, M. Masuda, Y. Seino, P. Cheema, M. Laurenza, L. Chen, H. Miyake, A. Beaubien, E. Graziani, A. Natochii, U. Tamponi, L. Aggarwal, D. Biswas, D. Bodrov, M. J. Lee, C. Ketter, A. Korobov, T. Kuhr, A. Panta, T. K. Pedlar, M. Sobotzik, S. Stefkova, C. Praz, M. Mirra, K. Miyabayashi, P. Kodyš, Q. Y. Liu, J. Becker, J. A. McKenna, H. Ono, Hikari Murakami, J. Park, J. Borah, A. Di Canto, M. Schnepf, S. Reiter, A. Budano, J. Baudot, S. Wallner, S. Sandilya, F. Simon, D. Kumar, A. Gellrich, R. Maiti, Michael H. Bartl, H. Lee, Arthur Martens, Y. Kulii, E. Solovieva, R. Mussa, R. Manfredi, G. De Pietro, C. Finck, R. Sobie, T. Kunigo, P. Branchini, A. Passeri, Q. Zhou, V. Babu, S. Saha, V. Bhardwaj, Y. Guan, G. Rizzo, D. Y. Kim, T. Lueck, R. Tiwary, D. Liventsev, P. Gironella Gironell, S. Ogawa, A. Bobrov, R. Okubo, S. Bettarini, P. Jackson, S. Kohani, M. Piccolo, S. Lin, M. Wakai, Z. Doležal, D. A. Sanders, A. Rostomyan, P. Urquijo, H. Kindo, K. H. Kang, C. Wessel, T. Fillinger, K. Kumara, S. Raiz, M. Takahashi, S. Nishida, T. Fillinger, G. Ghevondyan, S. S. Tang, P. Leo, D. M. Asner, Н. Акопов, G. Giakoustidis, R. Kumar, S. Prell, N. Anh Ky, K. Yoshihara, L. K. Li, M. Barrett, M. Campajola, I. Ripp-Baudot, R. Pestotnik, R. de Sangro, K. R. Amos, B. Scavino, V. Vobbilisetti, K. Cho, S. Lacaprara, M. Nayak, R. Giordano, P. Stavroulakis, T. V. Dong, B. Bhuyan, I. Ueda, M. Destefanis, K. E. Varvell, A. Boschetti, M. Reif, E. Kovalenko, K. Kojima, M. Hernández Villanueva, M. Nakao, X. T. Hou, R. A. Briere, W. W. Jacobs, C. Miller, X. P. Xu, P. Rados, G. Finocchiaro, M. Takizawa, M. Sumihama, K. Uno, M. Iwasaki, Y.B Li, Jing Yuan, C. Kiesling, K. Tanida, K. Schoenning, P. Bambade, C. Mariñas, M. Dorigo, M. Veronesi, A. Giri, R. Kowalewski, B. Yabsley, H. Hayashii, L. Corona, W. Shan, P. Krokovny, C. Sfienti, M. Mantovano, K. Unger, P. Horak, Richard T. Hoppe, L. Šantelj, J. Chin, W. Yan, S. K. Maurya, C. Chen, F. F. Trantou, J. Yelton, A. Johnson, T. Shimasaki, I. Nakamura, E. Prencipe, J. Lin, L. Vitale, Q. Campagna, V. Zhilich, K. Yi, M. H. Liu, L. Reuter, J. S. Zhou, J. H. Yin, T. Shillington, F. Tenchini, S. Bussino, T. Nguyen Manh, H. Svidras, K. Ravindran, N. Ipsita, N. Rout, D. Greenwald, L. Zani, T. Koga, B. G. Fulsom, K. Gudkova, M. T. Prim, F. Forti, M. T. Hedges, R. Farkas, S. Spataro, F. Becherer, A. Gaz, I. Haide, P. Ecker, A. Heidelbach, D. Meleshko, G. Heine, J. A. Colorado-Caicedo, I. Heredia-De La Cruz, Zhiqing Liu, F. Meier, E. Torassa, O. Gogota, L. Massaccesi, E. Bertholet, J. U. Rehman, L. Zhu, J. Skorupa, I. Domínguez Jiménez, Felix Keil, D. Ghosh, Y. P. Liao, M. Zeyrek, X. D. Shi, L. E. Piilonen, T. S. Lau, V. Gautam, M. Merola, G. Casarosa, A. Warburton, V. Gaur, T. Ferber, S. H. Robertson, S. Jia, C. Martellini, D. Shtol, R. Nomaru, E. De La Cruz–Burelo, M. Starič, K. Senyo, Y. Unno, S. Korpar, S. Uno, M. Bračko, K. Kinoshita, T. Aushev, G. De Nardo, I. Adachi, F. Bianchi, A. Sibidanov, R. Itoh, R. Žlebčík, I. Tsaklidis, V. Bertacchi, R. Tiwary, M. Bessner, R. van Tonder, S. Bahinipati, T. Higuchi, K. Sumisawa, G. Schnell, T. Podobnik, H. -E. Cho, H. Atmacan, A. Gale, T. Iijima, H. Purwar, S. Choudhury, P. Goldenzweig, T. Martinov, Xu Dong, T. Humair, E. Manoni, H. Ahmed, R. Godang, Y. H. Ahn, A. Bożek, K. Trabelsi, G. Pakhlova, S. Vahsen, Z. Natkaniec, R. Stroili, J. M. Roney, P. Križan, M. Maushart, Yue Ma, Sw. Banerjee, C. Cheshta, M. Abumusabh, L. Salutari
article en

Abstract

A bstract We present a measurement of the time-dependent CP asymmetry in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays using a data set of 365 fb − 1 recorded by the Belle II experiment and the final data set of 711 fb − 1 recorded by the Belle experiment at the Υ(4S) resonance. The direct and mixing-induced time-dependent CP violation parameters C and S are determined along with two additional quantities, S + and S − , defined in the two halves of the $${m}^{2}\left({K}_{\text{S}}^{0}{\pi }^{+}\right)-{m}^{2}\left({K}_{\text{S}}^{0}{\pi }^{-}\right)$$ plane. The measured values are C = − 0 . 17 ± 0 . 09 ± 0 . 04, S = − 0 . 29 ± 0 . 11 ± 0 . 05, S + = −0 . 57 ± 0 . 23 ± 0 . 10 and S − = 0 . 31 ± 0 . 24 ± 0 . 05, where the first uncertainty is statistical and the second systematic.

Journal of High Energy PhysicsVol. 2026(1)
Twitter (United States) (US), Korea Electric Power Corporation (South Korea) (KR)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, Univerzita Karlova v Praze, Grantová Agentura, Univerzita Karlova, University of Tabuk, Vietnam Academy of Science and Technology, Thailand Center of Excellence in Physics, National Research Foundation of Ukraine, European Commission, National Research Foundation, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, King Saud University, Austrian Science Fund, Generalitat Valenciana, Korea Institute of Science and Technology, Korea Institute of Science and Technology Information, Ikerbasque, Basque Foundation for Science, Knut och Alice Wallenbergs Stiftelse, Max-Planck-Gesellschaft, Javna Agencija za Raziskovalno Dejavnost RS, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Natural Science Foundation of Shandong Province, National Research University Higher School of Economics, Ministry of Education and Science of Ukraine, Ministry of Science and Higher Education of the Russian Federation, Istituto Nazionale di Fisica Nucleare, Bundesministerium für Bildung, Wissenschaft und Forschung, National Science and Technology Council, Alliance de recherche numérique du Canada, Korea Research Environment Open Network, Natural Sciences and Engineering Research Council of Canada, Deutsches Elektronen-Synchrotron, Japan Society for the Promotion of Science, Akademi Sains Malaysia, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Institut National de Physique Nucléaire et de Physique des Particules, Pacific Northwest National Laboratory
Openalex Percentile: Top 99%
Particle physics theoretical and experimental studies
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.