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Observation of the Radiative Decay Ds0*(2317)+→Ds*+γ

M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed, Y. Ahn, H. Aihara, N. Akopov, S. Alghamdi, M. Alhakami et al. (Belle and Belle II Collaboration)

M. Alhakami, A. Aloisio, N. Althubiti, K. Amos, N. Anh Ky, C. Antonioli, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, N. K. Baghel, S. Bahinipati, P. Bambade, Sw. Banerjee, M. Barrett, M. Bartl, J. Baudot, A. Beaubien, J. Becker, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, 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, G. Casarosa, C. Cecchi, 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. A. Colorado-Caicedo, I. Consigny, L. Corona, J. X. Cui, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. Di Canto, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, X. Dong, M. Dorigo, G. Dujany, P. Ecker, J. Eppelt, R. Farkas, P. Feichtinger, T. Ferber, T. Fillinger, C. Finck, G. Finocchiaro, F. Forti, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, V. Gautam, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, R. Giordano, A. Giri, P. Gironella Gironell, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, E. Graziani, D. Greenwald, K. Gudkova, I. Haide, Y. Han, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, G. Heine, I. Heredia de la Cruz, T. Higuchi, M. Hoek, M. Hohmann, R. Hoppe, P. Horak, X. T. Hou, C.-L. Hsu, A. Huang, T. Humair, T. Iijima, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, 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. Kiesling, D. Y. 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, D. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, T. Lam, 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, S. X. Li, W. Z. Li, Y. Li, Y. B. Li, Y. P. Liao, J. Libby, J. Lin, V. Lisovskyi, M. H. Liu, Q. 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, M. Mantovano, D. Marcantonio, M. Marfoli, C. Marinas, C. Martellini, A. Martens, T. Martinov, L. Massaccesi, M. Masuda, D. Matvienko, M. Maushart, J. A. McKenna, Z. Mediankin Gruberová, R. Mehta, F. Meier, D. Meleshko, M. Merola, C. Miller, M. Mirra, H. Miyake, R. Mizuk, G. B. Mohanty, S. Moneta, H.-G. Moser, I. Nakamura, M. Nakao, M. Naruki, Z. Natkaniec, A. Natochii, M. Nayak, S. Nishida, R. Nomaru, S. Ogawa, H. Ono, F. Otani, G. Pakhlova, A. Panta, S. Pardi, K. Parham, J. 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, C. Praz, S. Prell, M. T. Prim, S. Privalov, 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, S. Saha, L. Salutari, D. A. Sanders, L. Santelj, C. Santos, V. Savinov, B. Scavino, S. Schneider, K. Schoenning, C. Schwanda, Y. Seino, K. Senyo, J. Serrano, C. Sfienti, W. Shan, G. Sharma, C. P. Shen, X. D. Shi, T. Shillington, J.-G. Shiu, D. Shtol, B. Shwartz, A. Sibidanov, F. Simon, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, K. Špenko, B. Spruck, M. Starič, P. Stavroulakis, R. Stroili, M. Sumihama, S. S. Tang, K. Tanida, F. Tenchini, F. Testa, A. Thaller, T. Tien Manh, O. Tittel, R. Tiwary, E. Torassa, K. Trabelsi, F. F. Trantou, I. Ueda, 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, J. Yelton, K. Yi, J. H. Yin, K. Yoshihara, J. Yuan, Y. Yusa, L. Zani, M. Zeyrek, J. S. Zhou, Q. D. Zhou, L. Zhu, and R. Žlebčík (Belle and Belle II Collaboration)

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Phys. Rev. Lett. 136, 241901 – Published 16 June, 2026

DOI: https://doi.org/10.1103/vcld-225s

Abstract

We report the first observation of the radiative decay Ds0*(2317)+→Ds*+γ with a statistical significance exceeding 10 standard deviations. The signal is observed in the continuum e+e−→cc¯ process, using combined data samples of 980.4  fb−1 from Belle and 427.9  fb−1 from Belle II, collected at the KEKB and SuperKEKB asymmetric-energy e+e− colliders, respectively. The branching fraction ratio B[Ds0*(2317)+→Ds*+γ]/B[Ds0*(2317)+→Ds+π0] is measured to be [7.13±0.70(stat)±0.26(syst)]%. This result provides crucial discrimination between theoretical models of the Ds0*(2317)+ structure.

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Physics Subject Headings (PhySH)

synopsis

Strange-Particle Decay Comes to Light

Published 16 June, 2026

An exotic meson’s photon-emitting decay opens a window into the particle’s long-debated structure.

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Phys. Rev. Lett. 136, 241901– Published 16 June, 2026
  • Received 3 November 2025
  • Revised 25 March 2026
  • Accepted 4 May 2026
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