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1. Determination of the CKM angle ϕ 3 from a combination of Belle and Belle II results

Author: The Belle and Belle II collaborations, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, S. Al Said, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, J. Baudot, A. Baur, A. Beaubien, F. Becherer, J. Becker, K. Belous, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, L. Bierwirth, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, R. Cheaib, P. Cheema, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, L. Corona, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, M. Dorigo, K. Dort, D. Dossett, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, T. Hara, H. Hayashii, S. Hazra, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, H. Junkerkalefeld, D. Kalita, A. B. Kaliyar, J. Kandra, T. Kawasaki, F. Keil, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, M. J. Lee, D. Levit, P. M. Lewis, C. Li, L. K. Li, Y. Li, Y. B. Li, J. Libby, M. H. Liu, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, C. Miller, M. Mirra, K. Miyabayashi, H. Miyake, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, K. R. Nakamura, M. Nakao, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, M. Neu, C. Niebuhr, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Panta, S. Pardi, K. Parham, H. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, G. Schnell, C. Schwanda, M. Schwickardi, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, M. Sumihama, K. Sumisawa, W. Sutcliffe, N. Suwonjandee, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Tsaklidis, M. Uchida, I. Ueda, Y. Uematsu, 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, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, X. L. Wang, Z. Wang, A. Warburton, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, B. Zhang, Y. Zhang, V. Zhilich, Q. D. Zhou, and V. I. Zhukova
Subjects: B Physics, CKM Angle Gamma, CP Violation, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report a determination of the CKM angle ϕ 3, also known as γ, from a combination of measurements using samples of up to 711 fb −1 from the Belle experiment and up to 362 fb −1 from the Belle II experiment. We combine results from analyses of B + → DK +, B + → Dπ +, and B + → D * K + decays, where D is an admixture of D 0 and D ¯ 0 $$ {\overline{D}}^0 $$ mesons, in a likelihood fit to obtain ϕ 3 = (75.2 ± 7.6) ° . We also briefly discuss the interpretation of this result.
Published: 2024
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2. Measurement of the energy dependence of the e + e − → B B ¯ $$ B\overline{B} $$ , B B ¯ ∗ $$ B{\overline{B}}^{\ast } $$ , and B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ cross sections at Belle II

Author: The Belle II collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Althubiti, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, J. Baudot, M. Bauer, A. Baur, A. Beaubien, F. Becherer, J. Becker, P. K. Behera, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, L. Bierwirth, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, 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, J. Cerasoli, M.-C. Chang, P. Chang, P. Cheema, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, J. Cochran, L. Corona, J. X. Cui, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, D. Dorner, K. Dort, D. Dossett, S. Dreyer, S. Dubey, K. Dugic, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, A. Garmash, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, K. Hara, T. Hara, C. Harris, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, S. Ito, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, A. Johnson, K. K. Joo, H. Junkerkalefeld, H. Kakuno, M. Kaleta, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Ketter, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, Y. Kulii, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, R. Leboucher, F. R. Le Diberder, M. J. Lee, P. Leitl, P. Leo, D. Levit, P. M. Lewis, C. Li, L. K. Li, S. X. Li, Y. Li, Y. B. Li, J. Libby, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, A. Lozar, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, M. Nakao, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, M. Neu, C. Niebuhr, N. K. Nisar, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, S. Pardi, K. Parham, H. Park, J. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, F. Pham, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, S. Privalov, H. Purwar, N. Rad, P. Rados, G. Raeuber, S. Raiz, N. Rauls, K. Ravindran, M. Reif, S. Reiter, M. Remnev, L. Reuter, I. Ripp-Baudot, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, D. A. Sanders, S. Sandilya, A. Sangal, L. Santelj, Y. Sato, V. Savinov, B. Scavino, S. Schneider, M. Schnepf, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. Sharma, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, K. Smith, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, Z. S. Stottler, R. Stroili, J. Strube, Y. Sue, M. Sumihama, K. Sumisawa, W. Sutcliffe, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, N. Toutounji, K. Trabelsi, I. Tsaklidis, M. Uchida, I. Ueda, Y. Uematsu, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. van Tonder, G. S. Varner, K. E. Varvell, M. Veronesi, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, X. L. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, L. Zani, F. Zeng, B. Zhang, Y. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: e +-e − Experiments, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report measurements of the e + e − → B B ¯ $$ B\overline{B} $$ , B B ¯ ∗ $$ B{\overline{B}}^{\ast } $$ , and B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle II experiment. We reconstruct one B meson in a large number of hadronic final states and use its momentum to identify the production process. In the first 2 – 5 MeV above B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ threshold, the e + e − → B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
Published: 2024
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3. Measurements of the branching fractions of Ξ c 0 → Ξ 0 π 0 $$ {\Xi}_c^0\to {\Xi}^0{\pi}^0 $$ , Ξ c 0 → Ξ 0 η $$ {\Xi}_c^0\to {\Xi}^0\eta $$ , and Ξ c 0 → Ξ 0 η ′ $$ {\Xi}_c^0\to {\Xi}^0{\eta}^{\prime } $$ and asymmetry parameter of Ξ c 0 → Ξ 0 π 0 $$ {\Xi}_c^0\to {\Xi}^0{\pi}^0 $$

Author: The Belle and Belle II collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, N. Althubiti, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, M. Barrett, 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, B. Bhuyan, F. Bianchi, L. Bierwirth, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, J. Borah, A. Boschetti, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, Q. Campagna, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, P. Cheema, C. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, L. Corona, J. X. Cui, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, K. Dort, D. Dossett, S. Dubey, K. Dugic, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, T. Fillinger, C. Finck, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, K. Gudkova, I. Haide, S. Halder, Y. Han, T. Hara, C. Harris, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, A. Johnson, K. K. Joo, H. Junkerkalefeld, M. Kaleta, J. Kandra, K. H. Kang, S. Kang, G. Karyan, F. Keil, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, K. Lalwani, T. Lam, J. S. Lange, M. Laurenza, R. Leboucher, M. J. Lee, C. Lemettais, P. Leo, D. Levit, P. M. Lewis, L. K. Li, S. X. Li, Y. Li, Y. B. Li, J. Libby, Z. Liptak, M. H. Liu, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, C. Martellini, A. Martens, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, G. B. Mohanty, S. Moneta, H.-G. Moser, M. Mrvar, I. Nakamura, M. Nakao, Y. Nakazawa, M. Naruki, Z. Natkaniec, A. Natochii, M. Nayak, G. Nazaryan, M. Neu, M. Niiyama, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, G. Pakhlova, S. Pardi, K. Parham, H. Park, J. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, M. Remnev, L. Reuter, I. Ripp-Baudot, G. Rizzo, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, S. Schneider, M. Schnepf, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. Sharma, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, E. Solovieva, W. Song, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, M. Sumihama, K. Sumisawa, N. Suwonjandee, H. Svidras, M. Takahashi, M. Takizawa, S. Tanaka, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, S. E. Vahsen, R. van Tonder, K. E. Varvell, M. Veronesi, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, A. Vossen, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, Z. Wang, A. Warburton, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, Y. M. Yook, K. Yoshihara, C. Z. Yuan, L. Zani, F. Zeng, B. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: Branching fraction, Charm Physics, e +-e − Experiments, Particle and Resonance Production, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present a study of Ξ c 0 → Ξ 0 π 0 $$ {\Xi}_c^0\to {\Xi}^0{\pi}^0 $$ , Ξ c 0 → Ξ 0 η $$ {\Xi}_c^0\to {\Xi}^0\eta $$ , and Ξ c 0 → Ξ 0 η ′ $$ {\Xi}_c^0\to {\Xi}^0{\eta}^{\prime } $$ decays using the Belle and Belle II data samples, which have integrated luminosities of 980 fb −1 and 426 fb −1, respectively. We measure the following relative branching fractions B Ξ c 0 → Ξ 0 π 0 / B Ξ c 0 → Ξ − π + = 0.48 ± 0.02 stat ± 0.03 syst , B Ξ c 0 → Ξ 0 η / B Ξ c 0 → Ξ − π + = 0.11 ± 0.01 stat ± 0.01 syst , B Ξ c 0 → Ξ 0 η ′ / B Ξ c 0 → Ξ − π + = 0.08 ± 0.02 stat ± 0.01 syst $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to {\Xi}^0{\pi}^0\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.48\pm 0.02\left(\textrm{stat}\right)\pm 0.03\left(\textrm{syst}\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Xi}^0\eta \right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.11\pm 0.01\left(\textrm{stat}\right)\pm 0.01\left(\textrm{syst}\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Xi}^0{\eta}^{\prime}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.08\pm 0.02\left(\textrm{stat}\right)\pm 0.01\left(\textrm{syst}\right)\end{array}} $$ for the first time, where the uncertainties are statistical (stat) and systematic (syst). By multiplying by the branching fraction of the normalization mode, B Ξ c 0 → Ξ − π + $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$ , we obtain the following absolute branching fraction results B Ξ c 0 → Ξ 0 π 0 = 6.9 ± 0.3 stat ± 0.5 syst ± 1.3 norm × 10 − 3 , B Ξ c 0 → Ξ 0 η = 1.6 ± 0.2 stat ± 0.2 syst ± 0.3 norm × 10 − 3 , B Ξ c 0 → Ξ 0 η ′ = 1.2 ± 0.3 stat ± 0.1 syst ± 0.2 norm × 10 − 3 , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to {\Xi}^0{\pi}^0\right)=\left(6.9\pm 0.3\left(\textrm{stat}\right)\pm 0.5\left(\textrm{syst}\right)\pm 1.3\left(\operatorname{norm}\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Xi}^0\eta \right)=\left(1.6\pm 0.2\left(\textrm{stat}\right)\pm 0.2\left(\textrm{syst}\right)\pm 0.3\left(\operatorname{norm}\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\varXi}_c^0\to {\Xi}^0{\eta}^{\prime}\right)=\left(1.2\pm 0.3\left(\textrm{stat}\right)\pm 0.1\left(\textrm{syst}\right)\pm 0.2\left(\operatorname{norm}\right)\right)\times {10}^{-3},\end{array}} $$ where the third uncertainties are from B Ξ c 0 → Ξ − π + $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$ . The asymmetry parameter for Ξ c 0 → Ξ 0 π 0 $$ {\Xi}_c^0\to {\Xi}^0{\pi}^0 $$ is measured to be α Ξ c 0 → Ξ 0 π 0 = − 0.90 ± 0.15 stat ± 0.23 syst $$ \alpha \left({\Xi}_c^0\to {\Xi}^0{\pi}^0\right)=-0.90\pm 0.15\left(\textrm{stat}\right)\pm 0.23\left(\textrm{syst}\right) $$ .
Published: 2024
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4. Search for lepton-flavor-violating τ − → μ − μ + μ − decays at Belle II

Author: The Belle II collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, N. Althubiti, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, 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, F. Bianchi, L. Bierwirth, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, J. Borah, A. Boschetti, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, Q. Campagna, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, R. Cheaib, P. Cheema, C. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, J. Cochran, L. Corona, J. X. Cui, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, D. Dorner, K. Dort, D. Dossett, S. Dreyer, S. Dubey, K. Dugic, G. Dujany, P. Ecker, M. Eliachevitch, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, T. Hara, C. Harris, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, D. E. Jaffe, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, H. Junkerkalefeld, M. Kaleta, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, K. Lalwani, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, M. J. Lee, P. Leo, C. Lemettais, D. Levit, P. M. Lewis, L. K. Li, S. X. Li, Y. Li, Y. B. Li, J. Libby, M. H. Liu, Q. Y. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, G. B. Mohanty, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, K. R. Nakamura, M. Nakao, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, M. Neu, C. Niebuhr, J. Ninkovic, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, F. Otani, P. Pakhlov, G. Pakhlova, S. Pardi, K. Parham, H. Park, J. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, I. Prudiev, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, L. Reuter, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, S. Schneider, C. Schwanda, M. Schwickardi, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. Sharma, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, K. Smith, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, Y. Sue, M. Sumihama, K. Sumisawa, W. Sutcliffe, N. Suwonjandee, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, 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, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, A. Vossen, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, X. L. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, C. Wessel, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, Y. M. Yook, K. Yoshihara, C. Z. Yuan, L. Zani, F. Zeng, B. Zhang, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: e +-e − Experiments, Flavour Physics, Tau Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present the result of a search for the charged-lepton-flavor violating decay τ − → μ − μ + μ − using a 424 fb −1 sample of data recorded by the Belle II experiment at the SuperKEKB e + e − collider. The selection of e + e − → τ + τ − events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a 90% confidence level upper limit of 1.9 × 10 −8 on the branching fraction of the τ − → μ − μ + μ − decay, which is the most stringent bound to date.
Published: 2024
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5. Test of light-lepton universality in τ decays with the Belle II experiment

Author: The Belle II collaboration, I. Adachi, K. Adamczyk, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, 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, F. Bianchi, L. Bierwirth, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, J. Borah, A. Boschetti, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, R. Cheaib, P. Cheema, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, L. Corona, J. X. Cui, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, D. Dorner, K. Dort, D. Dossett, S. Dreyer, S. Dubey, K. Dugic, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, Y. Han, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, D. E. Jaffe, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, H. Junkerkalefeld, M. Kaleta, D. Kalita, A. B. Kaliyar, J. Kandra, S. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, J. Kumar, M. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, K. Lalwani, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, M. J. Lee, P. Leo, C. Lemettais, D. Levit, P. M. Lewis, C. Li, L. K. Li, S. X. Li, Y. Li, Y. B. Li, J. Libby, Z. Liptak, M. H. Liu, Q. Y. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, K. R. Nakamura, M. Nakao, H. Nakazawa, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, M. Neu, C. Niebuhr, J. Ninkovic, S. Nishida, A. Novosel, S. Ogawa, Y. Onishchuk, H. Ono, F. Otani, P. Pakhlov, G. Pakhlova, A. Panta, S. Pardi, K. Parham, H. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, I. Prudiiev, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, C. Schwanda, M. Schwickardi, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, X. D. Shi, T. Shillington, J.-G. Shiu, D. Shtol, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, Y. Sue, M. Sumihama, K. Sumisawa, W. Sutcliffe, N. Suwonjandee, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Tsaklidis, M. Uchida, 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, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, X. L. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, Y. Yusa, L. Zani, F. Zeng, B. Zhang, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: e +-e − Experiments, Tau Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present a measurement of the ratio R μ = B τ − → μ − ν ¯ μ ν τ / B τ − → e − ν ¯ e ν τ $$ {R}_{\mu }=\mathcal{B}\left({\tau}^{-}\to {\mu}^{-}{\overline{\nu}}_{\mu }{\nu}_{\tau}\right)/\mathcal{B}\left({\tau}^{-}\to {e}^{-}{\overline{\nu}}_e{\nu}_{\tau}\right) $$ of branching fractions B $$ \mathcal{B} $$ of the τ lepton decaying to muons or electrons using data collected with the Belle II detector at the SuperKEKB e + e − collider. The sample has an integrated luminosity of 362 ± 2 fb −1 at a centre-of-mass energy of 10.58 GeV. Using an optimised event selection, a binned maximum likelihood fit is performed using the momentum spectra of the electron and muon candidates. The result, R μ = 0.9675 ± 0.0007 ± 0.0036, where the first uncertainty is statistical and the second is systematic, is the most precise to date. It provides a stringent test of the light-lepton universality, translating to a ratio of the couplings of the muon and electron to the W boson in τ decays of 0.9974 ± 0.0019, in agreement with the standard model expectation of unity.
Published: 2024
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6. Measurement of the branching fractions of B ¯ $$ \overline{B} $$ → D () K − K S ∗ 0 $$ {K}_{(S)}^{\left(\ast \right)0} $$ and B ¯ $$ \overline{B} $$ → D () D s − $$ {D}_s^{-} $$ decays at Belle II

Author: The Belle II collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, N. Althubiti, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, 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, B. Bhuyan, F. Bianchi, L. Bierwirth, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, 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, J. Cerasoli, M.-C. Chang, P. Chang, P. Cheema, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, L. Corona, J. X. Cui, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, D. Dorner, K. Dort, D. Dossett, S. Dreyer, S. Dubey, K. Dugic, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, K. Gudkova, I. Haide, S. Halder, Y. Han, T. Hara, C. Harris, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, D. E. Jaffe, E.-J. Jang, S. Jia, Y. Jin, A. Johnson, K. K. Joo, H. Junkerkalefeld, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, K. Lalwani, T. Lam, J. S. Lange, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, M. J. Lee, C. Lemettais, P. Leo, D. Levit, P. M. Lewis, L. K. Li, S. X. Li, Y. Li, Y. B. Li, J. Libby, Z. Liptak, M. H. Liu, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, C. Martellini, A. Martens, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, F. Meier, M. Merola, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, R. Mizuk, G. B. Mohanty, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, M. Nakao, Y. Nakazawa, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, M. Neu, M. Niiyama, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, G. Pakhlova, S. Pardi, K. Parham, H. Park, J. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, M. Remnev, L. Reuter, I. Ripp-Baudot, G. Rizzo, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, S. Schneider, M. Schnepf, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. Sharma, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, M. Sumihama, H. Svidras, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, Y. Ushiroda, S. E. Vahsen, R. van Tonder, K. E. Varvell, M. Veronesi, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, A. Vossen, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, C. Wessel, J. Wiechczynski, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, S. B. Yang, J. Yelton, J. H. Yin, Y. M. Yook, K. Yoshihara, C. Z. Yuan, L. Zani, F. Zeng, B. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: B Physics, Branching fraction, e +-e − Experiments, Particle and Resonance Production, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present measurements of the branching fractions of eight B ¯ 0 $$ {\overline{B}}^0 $$ → D (*)+ K − K S ∗ 0 $$ {K}_{(S)}^{\left(\ast \right)0} $$ , B − → D (*)0 K − K S ∗ 0 $$ {K}_{(S)}^{\left(\ast \right)0} $$ decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Υ(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb −1. The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m(K − K S ∗ 0 $$ {K}_{(S)}^{\left(\ast \right)0} $$ ) and m(D (*) K S ∗ 0 $$ {K}_{(S)}^{\left(\ast \right)0} $$ ) in order to avoid dependence on the decay model. These results include the first observation of B ¯ 0 $$ {\overline{B}}^0 $$ → D + K − K S 0 $$ {K}_S^0 $$ , B − → D* 0 K − K S 0 $$ {K}_S^0 $$ , and B ¯ 0 $$ {\overline{B}}^0 $$ → D* + K − K S 0 $$ {K}_S^0 $$ decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the K − K S ∗ 0 $$ {K}_{(S)}^{\left(\ast \right)0} $$ systems are compatible with quasi-two-body decays via a resonant transition with spin-parity J P = 1− for the K − K S 0 $$ {K}_S^0 $$ systems and J P = 1+ for the K − K* 0 systems. We also present measurements of the branching fractions of four B ¯ 0 $$ {\overline{B}}^0 $$ → D (*)+ D s − $$ {D}_s^{-} $$ , B − → D (*)0 D s − $$ {D}_s^{-} $$ decay channels with a precision compatible to the current world averages.
Published: 2024
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7. Study of Υ(10753) decays to π + π − Υ(nS) final states at Belle II

Author: The Belle II collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, 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, B. Bhuyan, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, P. Cheema, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, L. Corona, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, M. Dorigo, K. Dort, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, T. Hara, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, K. K. Joo, H. Junkerkalefeld, H. Kakuno, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, R. Leboucher, F. R. Le Diberder, M. J. Lee, D. Levit, C. Li, L. K. Li, Y. Li, Y. B. Li, J. Libby, M. Liu, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, C. Miller, M. Mirra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, C. Niebuhr, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Panta, S. Pardi, K. Parham, H. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, M. Sumihama, K. Sumisawa, W. Sutcliffe, H. Svidras, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Tsaklidis, M. Uchida, 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, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, X. L. Wang, Z. Wang, A. Warburton, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, Y. Yusa, L. Zani, B. Zhang, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, and V. I. Zhukova
Subjects: e +-e − Experiments, Exotics, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present an analysis of the process e + e − → π + π − Υ(nS) (where n = 1, 2, or 3) reconstructed in 19.6 fb −1 of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the Υ(10753) resonance. By analyzing the mass distribution of the π + π − Υ(nS) system and the Born cross sections of the e + e − → π + π − Υ(nS) process, we report the first observation of Υ(10753) decays to the π + π − Υ(1S) and π + π − Υ(2S) final states, and find no evidence for decays to π + π − Υ(3S). Possible intermediate states in the π + π − Υ(1S, 2S) transitions are also investigated, and no evidence for decays proceeding via the π ∓ Z b ± $$ {\pi}^{\mp }{Z}_b^{\pm } $$ or f 0(980)Υ(nS) intermediate states is found. We measure Born cross sections for the e + e − → π + π − Υ(nS) process that, combined with results from Belle, obtain the mass and width of Υ(10753) to be (10756.6 ± 2.7 ± 0.9) MeV/c 2 and (29.0 ± 8.8 ± 1.2) MeV, respectively. The relative ratios of the Born cross sections at the Υ(10753) resonance peak are also reported for the first time.
Published: 2024
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8. Measurement of branching-fraction ratios and CP asymmetries in B ± → D CP± K ± decays at Belle and Belle II

Author: The Belle and Belle II collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, M. Barrett, J. Baudot, M. Bauer, A. Baur, A. Beaubien, F. Becherer, J. Becker, P. K. Behera, K. Belous, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, J. Borah, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, P. Cheema, V. Chekelian, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, J. Cochran, L. Corona, L. M. Cremaldi, T. Czank, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, K. Dort, D. Dossett, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, A. Garmash, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hoek, M. Hohmann, P. Horak, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, S. Ito, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, A. Johnson, H. Junkerkalefeld, H. Kakuno, A. B. Kaliyar, J. Kandra, K. H. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Ketter, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, R. Leboucher, F. R. Le Diberder, M. J. Lee, P. Leitl, D. Levit, P. M. Lewis, C. Li, J. Li, L. K. Li, Y. Li, J. Libby, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, T. Luo, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, T. Matsuda, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, M. Mirra, K. Miyabayashi, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, T. Nakano, Y. Nakazawa, A. Narimani Charan, M. Naruki, Z. Natkaniec, A. Natochii, L. Nayak, G. Nazaryan, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, S. Pardi, K. Parham, H. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, F. Pham, M. Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, N. Rad, P. Rados, G. Raeuber, S. Raiz, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, L. B. Rizzuto, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. Sharma, X. D. Shi, T. Shillington, J.-G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, Z. S. Stottler, R. Stroili, J. Strube, M. Sumihama, K. Sumisawa, W. Sutcliffe, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, N. Toutounji, K. Trabelsi, I. Tsaklidis, M. Uchida, I. Ueda, S. Uehara, Y. Uematsu, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. van Tonder, G. S. Varner, K. E. Varvell, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, D. Wang, E. Wang, M.-Z. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, M. Welsch, C. Wessel, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. H. Yin, K. Yoshihara, C. Z. Yuan, L. Zani, Y. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: B Physics, CKM Angle Gamma, CP Violation, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report results from a study of B ± → DK ± decays followed by D decaying to the CP-even final state K + K − and CP-odd final state K S 0 π 0 $$ {K}_S^0{\pi}^0 $$ , where D is an admixture of D 0 and D ¯ 0 $$ {\overline{D}}^0 $$ states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle ϕ 3. The results are based on a combined analysis of the final data set of 772 × 106 B B ¯ $$ B\overline{B} $$ pairs collected by the Belle experiment and a data set of 198 × 106 B B ¯ $$ B\overline{B} $$ pairs collected by the Belle II experiment, both in electron-positron collisions at the Υ(4S) resonance. We measure the CP asymmetries to be A $$ \mathcal{A} $$ CP+ = (+12.5 ± 5.8 ± 1.4)% and A $$ \mathcal{A} $$ CP− = (−16.7 ± 5.7 ± 0.6)%, and the ratios of branching fractions to be R $$ \mathcal{R} $$ CP+ = 1.164 ± 0.081 ± 0.036 and R $$ \mathcal{R} $$ CP− = 1.151 ± 0.074 ± 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries A $$ \mathcal{A} $$ CP+ and A $$ \mathcal{A} $$ CP− have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5 ° < ϕ 3 < 16.5 ° ) or (84.5 ° < ϕ 3 < 95.5 ° ) or (163.3 ° < ϕ 3 < 171.5 ° ) and 0.321 < r B < 0.465.
Published: 2024
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9. Search for charged-lepton flavor violation in Υ(2S) → ℓ ∓ τ ± (ℓ = e, μ) decays at Belle

Author: The Belle collaboration, R. Dhamija, S. Nishida, A. Giri, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, Sw. Banerjee, M. Bauer, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, D. Biswas, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Das, G. De Nardo, G. De Pietro, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, P. Ecker, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, P. Goldenzweig, E. Graziani, T. Gu, Y. Guan, K. Gudkova, C. Hadjivasiliou, K. Hayasaka, H. Hayashii, S. Hazra, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, P. Križan, P. Krokovny, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, Y.-T. Lai, S. C. Lee, D. Levit, P. Lewis, L. K. Li, L. Li Gioi, J. Libby, K. Lieret, Y.-R. Lin, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, S. K. Maurya, F. Meier, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, I. Nakamura, M. Nakao, A. Natochii, L. Nayak, M. Niiyama, N. K. Nisar, S. Ogawa, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, J. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, C. Sharma, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, S. E. Vahsen, K. E. Varvell, A. Vinokurova, D. Wang, E. Wang, M.-Z. Wang, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, J. H. Yin, C. Z. Yuan, L. Yuan, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: Beyond Standard Model, e +-e − Experiments, Flavour Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report a search for the charged-lepton flavor violation in Υ(2S) → ℓ ∓ τ ± (ℓ = e, μ) decays using a 25 fb −1 Υ(2S) sample collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ( B $$ \mathcal{B} $$ ) at 90% confidence level. We obtain the most stringent upper limits: B $$ \mathcal{B} $$ (Υ(2S) → μ ∓ τ ± ) < 0.23 × 10 −6 and B $$ \mathcal{B} $$ (Υ(2S) → e ∓ τ ± ) < 1.12 × 10 −6.
Published: 2024
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10. Measurement of CP asymmetries and branching-fraction ratios for B ± → DK ± and Dπ ± with D → K S 0 $$ {K}_{\textrm{S}}^0 $$ K ± π ∓ using Belle and Belle II data

Author: The Belle and Belle II collaborations, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, T. Aushev, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, M. Barrett, J. Baudot, M. Bauer, A. Baur, A. Beaubien, J. Becker, P. K. Behera, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, J. Borah, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M.-C. Chang, P. Chang, R. Cheaib, P. Cheema, V. Chekelian, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, J. Cochran, L. Corona, L. M. Cremaldi, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, K. Dort, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, D. Epifanov, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, A. Garmash, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, T. Hara, K. Hayasaka, S. Hazra, M. T. Hedges, I. Heredia de la Cruz, M. Hernández Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hoek, M. Hohmann, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, S. Ito, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, D. E. Jaffe, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, A. Johnson, H. Junkerkalefeld, A. B. Kaliyar, J. Kandra, K. H. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Ketter, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, P. Leitl, D. Levit, P. M. Lewis, C. Li, L. K. Li, J. Libby, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, T. Luo, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, C. Marinas, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, M. Mirra, K. Miyabayashi, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H.-G. Moser, M. Mrvar, R. Mussa, I. Nakamura, Y. Nakazawa, A. Narimani Charan, M. Naruki, Z. Natkaniec, A. Natochii, L. Nayak, G. Nazaryan, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, S. Pardi, K. Parham, H. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, F. Pham, M. Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, N. Rad, P. Rados, G. Raeuber, S. Raiz, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, G. Schnell, M. Schnepf, C. Schwanda, A. J. Schwartz, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. Sharma, X. D. Shi, T. Shillington, J.-G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, Z. S. Stottler, R. Stroili, M. Sumihama, K. Sumisawa, W. Sutcliffe, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Tsaklidis, M. Uchida, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. van Tonder, G. S. Varner, K. E. Varvell, M. Veronesi, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M.-Z. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, M. Welsch, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. H. Yin, K. Yoshihara, C. Z. Yuan, Y. Yusa, L. Zani, Y. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, V. I. Zhukova, and R. Žlebčík
Subjects: B Physics, CKM Angle Gamma, CP Violation, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We measure CP asymmetries and branching-fraction ratios for B ± → DK ± and Dπ ± decays with D → K S 0 $$ {K}_{\textrm{S}}^0 $$ K ± π ∓, where D is a superposition of D 0 and D ¯ $$ \overline{D} $$ 0. We use the full data set of the Belle experiment, containing 772 × 106 B B ¯ $$ B\overline{B} $$ pairs, and data from the Belle II experiment, containing 387 × 106 B B ¯ $$ B\overline{B} $$ pairs, both collected in electron-positron collisions at the Υ(4S) resonance. Our results provide model-independent information on the unitarity triangle angle ϕ 3.
Published: 2023
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11. Search for B s 0 $$ {\textrm{B}}_{\textrm{s}}^0 $$ → ℓ ∓ τ ± with the semi-leptonic tagging method at Belle

Author: The Belle collaboration, L. Nayak, S. Nishida, A. Giri, I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, S. Banerjee, M. Bauer, P. Behera, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, D. Biswas, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, J. Cochran, S. Das, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Dossett, S. Dubey, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, P. Goldenzweig, E. Graziani, T. Gu, Y. Guan, S. Halder, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, S. C. Lee, J. Li, L. K. Li, Y. Li, J. Libby, K. Lieret, Y.-R. Lin, D. Liventsev, T. Luo, Y. Ma, M. Masuda, T. Matsuda, S. K. Maurya, F. Meier, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, I. Nakamura, M. Nakao, Z. Natkaniec, A. Natochii, N. K. Nisar, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, J. Park, S.-H. Park, A. Passeri, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, A. Rostomyan, N. Rout, G. Russo, S. Sandilya, A. Sangal, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, J.-G. Shiu, A. Sibidanov, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, Y. Unno, K. Uno, S. Uno, P. Urquijo, S. E. Vahsen, G. Varner, K. E. Varvell, A. Vinokurova, D. Wang, M.-Z. Wang, S. Watanuki, E. Won, B. D. Yabsley, W. Yan, J. Yelton, Y. Yook, C. Z. Yuan, L. Yuan, Y. Yusa, Y. Zhai, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: B Physics, e +-e − Experiments, Flavour Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present a search for the lepton-flavor-violating decays B s 0 $$ {B}_s^0 $$ → ℓ ∓ τ ± , where ℓ = e, μ, using the full data sample of 121 fb −1 collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. We use B s 0 B ¯ s 0 $$ {B}_s^0{\overline{B}}_s^0 $$ events in which one B s 0 $$ {B}_s^0 $$ meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for B s 0 $$ {B}_s^0 $$ → ℓ ∓ τ ± decays and set upper limits on their branching fractions at 90% confidence level as B $$ \mathcal{B} $$ ( B s 0 $$ {B}_s^0 $$ → e ∓ τ ± ) < 14 × 10 −4 and B $$ \mathcal{B} $$ ( B s 0 $$ {B}_s^0 $$ → μ ∓ τ ± ) < 7.3 × 10 −4. Our result represents the first upper limit on the B s 0 $$ {B}_s^0 $$ → e ∓ τ ± decay rate.
Published: 2023
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12. Measurement of the e + e − → B s 0 B ¯ s 0 X $$ {B}_s^0{\overline{B}}_s^0X $$ cross section in the energy range from 10.63 to 11.02 GeV using inclusive D s + $$ {D}_s^{+} $$ and D 0 production

Author: The Belle collaboration, V. Zhukova, R. Mizuk, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, Sw. Banerjee, M. Bauer, P. Behera, K. Belous, J. Bennett, F. Bernlochner, M. Bessner, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bondar, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, M.-C. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, T. V. Dong, S. Dubey, P. Ecker, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, T. Gu, K. Gudkova, C. Hadjivasiliou, T. Hara, K. Hayasaka, S. Hazra, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, R. Kumar, A. Kuzmin, Y.-J. Kwon, Y.-T. Lai, T. Lam, M. Laurenza, S. C. Lee, D. Levit, L. K. Li, J. Libby, K. Lieret, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, S. K. Maurya, F. Meier, M. Merola, F. Metzner, K. Miyabayashi, G. B. Mohanty, I. Nakamura, T. Nakano, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, N. K. Nisar, S. Nishida, K. Ogawa, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, J. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, W. Shan, M. Shapkin, C. Sharma, J.-G. Shiu, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, W. Sutcliffe, M. Takizawa, K. Tanida, F. Tenchini, R. Tiwary, K. Trabelsi, M. Uchida, Y. Unno, S. Uno, Y. Usov, S. E. Vahsen, G. Varner, A. Vinokurova, D. Wang, E. Wang, M.-Z. Wang, X. L. Wang, M. Watanabe, S. Watanuki, O. Werbycka, E. Won, B. D. Yabsley, W. Yan, J. H. Yin, C. Z. Yuan, L. Yuan, Z. P. Zhang, and V. Zhilich
Subjects: B Physics, e +-e − Experiments, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report the first measurement of the inclusive e + e − → b b ¯ $$ b\overline{b} $$ → D s ± $$ {D}_s^{\pm } $$ X and e + e − → b b ¯ $$ b\overline{b} $$ → D 0 / D ¯ 0 $$ {\overline{D}}^0 $$ X cross sections in the energy range from 10.63 to 11.02 GeV. Based on these results, we determine σ(e + e − → B s 0 B ¯ s 0 $$ {B}_s^0{\overline{B}}_s^0 $$ X) and σ(e + e − → B B ¯ $$ B\overline{B} $$ X) in the same energy range. We measure the fraction of B s 0 $$ {B}_s^0 $$ events at Υ(10860) to be f s = ( 22.0 − 2.1 + 2.0 $$ {22.0}_{-2.1}^{+2.0} $$ )%. We determine also the ratio of the B s 0 $$ {B}_s^0 $$ inclusive branching fractions B $$ \mathcal{B} $$ ( B s 0 $$ {B}_s^0 $$ → D 0 / D ¯ 0 $$ {\overline{D}}^0 $$ X)/ B $$ \mathcal{B} $$ ( B s 0 $$ {B}_s^0 $$ → D s ± $$ {D}_s^{\pm } $$ X) = 0.416 ± 0.018 ± 0.092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider.
Published: 2023
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13. Search for the double-charmonium state with η c J/ψ at Belle

Author: The Belle collaboration, J. H. Yin, Y. B. Li, E. Won, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, Sw. Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, T. Bilka, D. Biswas, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, D. Červenkov, M.-C. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, J. Cochran, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, Y. Guan, K. Gudkova, C. Hadjivasiliou, S. Halder, T. Hara, K. Hayasaka, H. Hayashii, D. Herrmann, W.-S. Hou, C.-L. Hsu, T. Iijima, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, Q. P. Ji, S. Jia, Y. Jin, K. K. Joo, J. Kahn, A. B. Kaliyar, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, T. Lam, J. S. Lange, S. C. Lee, L. K. Li, Y. Li, J. Libby, K. Lieret, Y.-R. Lin, D. Liventsev, M. Masuda, T. Matsuda, D. Matvienko, S. K. Maurya, F. Meier, M. Merola, F. Metzner, R. Mizuk, G. B. Mohanty, R. Mussa, I. Nakamura, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, P. Oskin, G. Pakhlova, S. Pardi, H. Park, J. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, S. Sandilya, A. Sangal, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, W. Shan, M. Shapkin, C. Sharma, J.-G. Shiu, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, M. Takizawa, K. Tanida, F. Tenchini, R. Tiwary, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, S. E. Vahsen, G. Varner, A. Vinokurova, D. Wang, E. Wang, M.-Z. Wang, X. L. Wang, S. Watanuki, O. Werbycka, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, J. Yelton, Y. Yook, C. Z. Yuan, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: e +-e − Experiments, Exotics, QCD, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We measure the cross section of e + e − → η c J/ψ at the Υ(nS)(n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of 955 fb −1. We also search for double charmonium production in e + e − → η c J/ψ via initial state radiation near the η c J/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e + e − → η c J/ψ process is found with a statistical significance greater than 3.3σ near the η c J/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.
Published: 2023
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14. Search for lepton-flavor-violating τ decays into a lepton and a vector meson using the full Belle data sample

Author: The Belle collaboration, N. Tsuzuki, K. Inami, I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, Sw. Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, T. Bilka, D. Biswas, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, J. Cochran, S. Das, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, D. Dossett, S. Dubey, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, Y. Guan, K. Gudkova, X. Han, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, T. Iijima, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, S. C. Lee, J. Li, L. K. Li, Y. Li, J. Libby, K. Lieret, Y.-R. Lin, D. Liventsev, Y. Ma, A. Martini, M. Masuda, K. Matsuoka, D. Matvienko, S. K. Maurya, F. Meier, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, P. Oskin, G. Pakhlova, T. Pang, S. Pardi, H. Park, J. Park, S.-H. Park, A. Passeri, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, A. Rostomyan, N. Rout, G. Russo, S. Sandilya, A. Sangal, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, M. Shapkin, C. Sharma, J.-G. Shiu, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, G. Varner, A. Vinokurova, D. Wang, E. Wang, M.-Z. Wang, X. L. Wang, S. Watanuki, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, J. Yelton, Y. Yook, L. Yuan, Y. Zhai, V. Zhilichand, and V. Zhukova
Subjects: e +-e − Experiments, Tau Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of τ lepton decays into a light charged lepton (ℓ = e ± or μ ± ) and a vector meson (V 0 = ρ 0, ϕ, ω, K *0, or K ¯ $$ \overline{K} $$ *0) using 980 fb −1 of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the τ → ℓV 0 branching fractions in the range of (1.7–4.3) × 10 −8. These limits are improved by 30% on average from the previous results.
Published: 2023
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15. Two-particle angular correlations in e + e − collisions to hadronic final states in two reference coordinates at Belle

Author: The Belle collaboration, Y.-C. Chen, Y.-J. Lee, P. Chang, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, V. Chekelian, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Das, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, C. Hadjivasiliou, K. Hayasaka, H. Hayashii, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, R. Kumar, K. Kumara, Y.-J. Kwon, T. Lam, J. S. Lange, S. C. Lee, J. Li, L. K. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, C.-W. Lin, K. Lieret, D. Liventsev, M. Masuda, T. Matsuda, S. K. Maurya, F. Meier, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, M. Mrvar, R. Mussa, M. Nakao, Z. Natkaniec, A. Natochii, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, S. Sandilya, A. Sangal, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, R. Seidl, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, K. Uno, S. Uno, P. Urquijo, R. van Tonder, G. Varner, A. Vinokurova, A. Vossen, E. Waheed, E. Wang, M.-Z. Wang, X. L. Wang, M. Watanabe, S. Watanuki, E. Won, W. Yan, S. B. Yang, J. H. Yin, C. Z. Yuan, Y. Yusa, Y. Zhai, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: QCD, Quark Gluon Plasma, Relativistic Heavy Ion Physics, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present the analysis of two-particle angular correlations using coordinate systems defined with the conventional beam axis and the event thrust axis. We propose the latter as a good representation for the correlation structure interpretation in the e + e − collision system. The e + e − collisions to hadronic final states at center-of-mass energies of s $$ \sqrt{s} $$ = 10.52 GeV and 10.58 GeV are recorded by the Belle detector at KEKB. In this paper, results on the first dataset are supplementary to the previous Belle publication [1]. At the same time, the latter is the first two-particle correlation measurement at collision energy on the Υ(4S) resonance and is sensitive to its decay products. Measurements are reported as a function of the charged-particle multiplicity. Finally, a qualitative understanding of the correlation structure is discussed using a combination of Monte Carlo simulations and experimental data.
Published: 2023
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16. Measurement of two-photon decay width of χ c2(1P) in γγ → χ c2(1P) → J/ψγ at Belle

Author: The Belle collaboration, Y. Seino, K. Hayasaka, S. Uehara, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Das, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, E. Graziani, C. Hadjivasiliou, H. Hayashii, W.-S. Hou, C.-L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, H. Kakuno, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, R. Kumar, K. Kumara, T. Lam, J. S. Lange, S. C. Lee, C. H. Li, J. Li, L. K. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, M. Masuda, T. Matsuda, D. Matvienko, S. K. Maurya, F. Meier, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, M. Mrvar, R. Mussa, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, J. B. Singh, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, M. Sumihama, K. Sumisawa, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, K. Uno, S. Uno, R. van Tonder, G. Varner, A. Vinokurova, E. Waheed, E. Wang, M.-Z. Wang, X. L. Wang, M. Watanabe, S. Watanuki, E. Won, B. D. Yabsley, W. Yan, S. B. Yang, J. H. Yin, C. Z. Yuan, Y. Yusa, Y. Zhai, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov
Subjects: e +-e − Experiments, Quarkonium, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report the measurement of the two-photon decay width of χ c2(1P) in two-photon processes at the Belle experiment. We analyze the process γγ → χ c2(1P) → J/ψγ, J/ψ → ℓ + ℓ − (ℓ = e or μ) using a data sample of 971 fb −1 collected with the Belle detector at the KEKB e + e − collider. In this analysis, the product of the two-photon decay width of χ c2(1P) and the branching fraction is determined to be Γ γγ χ c 2 1 P B χ c 2 1 P → J / ψγ B J / ψ → ℓ + ℓ − = 14.8 ± 0.3 stat . ± 0.7 syst . $$ {\Gamma}_{\gamma \gamma}\left({\chi}_{c2}(1P)\right)\mathcal{B}\left({\chi}_{c2}(1P)\to J/\psi \gamma \right)\mathcal{B}\left(J/\psi \to {\ell}^{+}{\ell}^{-}\right)=14.8\pm 0.3\left(\textrm{stat}.\right)\pm 0.7\left(\textrm{syst}.\right) $$ eV, which corresponds to Γ γγ (χ c2(1P)) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from B $$ \mathcal{B} $$ (χ c2(1P) → J/ψγ) and B $$ \mathcal{B} $$ (J/ψ → ℓ + ℓ − ).
Published: 2023
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17. Evidence for the singly Cabibbo-suppressed decay Ω c 0 → Ξ − π + $$ {\Omega}_c^0\to {\Xi}^{-}{\pi}^{+} $$ and search for Ω c 0 → Ξ − K + $$ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} $$ and Ω − K + decays at Belle

Author: The Belle collaboration, X. Han, S. Jia, L. Yuan, C. P. Shen, I. Adachi, J. K. Ahn, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, Sw. Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, T. Bilka, D. Biswas, D. Bodrov, J. Borah, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, C. Hadjivasiliou, T. Hara, K. Hayasaka, H. Hayashii, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E.-J. Jang, Q. P. Ji, Y. Jin, A. B. Kaliyar, C. Kiesling, C. H. Kim, D. Y. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, Y.-J. Kwon, T. Lam, M. Laurenza, S. C. Lee, C. H. Li, J. Li, L. K. Li, S. X. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, M. Masuda, S. K. Maurya, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, R. Mussa, I. Nakamura, M. Nakao, H. Nakazawa, Z. Natkaniec, A. Natochii, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, G. Pakhlova, H. Park, J. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, E. Prencipe, M. T. Prim, N. Rout, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, M. Shapkin, C. Sharma, J.-G. Shiu, B. Shwartz, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, K. Uno, S. Uno, P. Urquijo, S. E. Vahsen, R. van Tonder, G. Varner, A. Vinokurova, X. L. Wang, E. Won, B. D. Yabsley, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, C. Z. Yuan, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: Branching fraction, Charm Physics, e +-e − Experiments, Particle and Resonance Production, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Using a data sample of 980 fb −1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study for the first time the singly Cabibbo-suppressed decays Ω c 0 → Ξ − π + $$ {\Omega}_c^0\to {\Xi}^{-}{\pi}^{+} $$ and Ω − K + and the doubly Cabibbo-suppressed decay Ω c 0 → Ξ − K + $$ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} $$ . Evidence for an Ω c 0 $$ {\Omega}_c^0 $$ signal in the Ω c 0 $$ {\Omega}_c^0 $$ → Ξ − π + mode is reported with a significance of 4.5σ including systematic uncertainties. The ratio of branching fractions to the normalization mode Ω c 0 $$ {\Omega}_c^0 $$ → Ω − π + is measured to be B Ω c 0 → Ξ − π + / B Ω c 0 → Ω − π + = 0.253 ± 0.052 stat . ± 0.030 syst . . $$ \mathcal{B}\left({\Omega}_c^0\to {\Xi}^{-}{\pi}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)=0.253\pm 0.052\left(\textrm{stat}.\right)\pm 0.030\left(\textrm{syst}.\right). $$ No significant signals of Ω c 0 → Ξ − K + $$ {\Omega}_c^0\to {\Xi}^{-}{K}^{+} $$ and Ω − K + modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to be B Ω c 0 → Ξ − K + / B Ω c 0 → Ω − π + < 0.070 $$ \mathcal{B}\left({\Omega}_c^0\to {\Xi}^{-}{K}^{+}\right)/\mathcal{B}\left({\Omega}_c^0\to {\Omega}^{-}{\pi}^{+}\right)
Published: 2023
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18. Erratum to: Combined analysis of Belle and Belle II data to determine the CKM angle ϕ 3 using B+ → D( K S 0 $$ {\textrm{K}}_{\textrm{S}}^0 $$ h+h − )h+ decays

Author: The BELLE and Belle II collaborations, F. Abudinén, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, S. Al Said, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aushev, R. Ayad, V. Babu, S. Bacher, S. Baehr, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, J. Baudot, J. Becker, P. K. Behera, K. Belous, J. V. Bennett, F. U. Bernlochner, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, D. Červenkov, P. Cheema, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, L. Corona, S. Cunliffe, T. Czank, S. Das, F. Dattola, E. De La Cruz-Burelo, G. de Marino, S. K. Maurya, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, R. Dhamija, A. Di Canto, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, D. Dossett, S. Dubey, G. Dujany, M. Eliachevitch, D. Epifanov, P. Feichtinger, D. Ferlewicz, T. Fillinger, S. Fiore, A. Fodor, F. Forti, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, V. Gaur, A. Gaz, R. Giordano, A. Giri, A. Glazov, R. Godang, P. Goldenzweig, B. Golob, W. Gradl, E. Graziani, D. Greenwald, T. Gu, Y. Guan, K. Gudkova, J. Guilliams, C. Hadjivasiliou, S. Halder, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, S. Hazra, I. Heredia de la Cruz, A. Hershenhorn, T. Higuchi, E. C. Hill, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, A. Ishikawa, M. Iwasaki, W. W. Jacobs, E.-J. Jang, Y. Jin, H. Junkerkalefeld, A. B. Kaliyar, K. H. Kang, R. Karl, G. Karyan, Y. Kato, C. Ketter, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, S. Korpar, E. Kovalenko, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, C. La Licata, L. Lanceri, J. S. Lange, R. Leboucher, S. C. Lee, P. Leitl, J. Li, S. X. Li, L. Li Gioi, J. Libby, K. Lieret, Z. Liptak, Q. Y. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, M. Maggiora, R. Maiti, S. Maity, R. Manfredi, E. Manoni, S. Marcello, A. Martini, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, J. A. McKenna, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, H.-G. Moser, F. Mueller, C. Murphy, R. Mussa, K. R. Nakamura, T. Nakano, M. Nakao, M. Naruki, D. Narwal, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, N. K. Nisar, S. Nishida, K. Nishimura, Y. Onishchuk, H. Ono, P. Oskin, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, K. Parham, S.-H. Park, A. Passeri, A. Pathak, S. Patra, R. Pestotnik, L. E. Piilonen, T. Podobnik, S. Pokharel, L. Polat, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, A. Rabusov, P. Rados, S. Raiz, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, L. B. Rizzuto, S. H. Robertson, M. Röhrken, J. M. Roney, A. Rostomyan, N. Rout, D. Sahoo, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, G. Schnell, J. Schueler, A. J. Schwartz, Y. Seino, A. Selce, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, T. Shillington, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, A. Soffer, E. Solovieva, S. Spataro, B. Spruck, S. Stefkova, Z. S. Stottler, R. Stroili, K. Sumisawa, W. Sutcliffe, S. Y. Suzuki, M. Tabata, M. Takizawa, K. Tanida, F. Tenchini, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, M. Uchida, I. Ueda, T. Uglov, K. Uno, S. Uno, Y. Ushiroda, S. E. Vahsen, R. van Tonder, K. E. Varvell, A. Vinokurova, L. Vitale, H. M. Wakeling, E. Wang, M.-Z. Wang, X. L. Wang, A. Warburton, S. Watanuki, O. Werbycka, C. Wessel, E. Won, B. D. Yabsley, W. Yan, H. Ye, K. Yoshihara, Y. Yusa, L. Zani, Y. Zhai, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, and V. I. Zhukova
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published: 2022
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19. Search for charged lepton flavor violating decays of ϒ (1S)

Author: The BELLE collaboration, S. Patra, V. Bhardwaj, K. Trabelsi, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, T. Bilka, A. Bobrov, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, A. Frey, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, M. Hernandez, Villanueva, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, K. T. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, K. Lalwani, T. Lam, J. S. Lange, S. C. Lee, C. H. Li, J. Li, L. K. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, A. Martini, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, R. Mussa, M. Nakao, A. Natochii, L. Nayak, M. Nayak, N. K. Nisar, S. Nishida, K. Ogawa, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, S.-H. Park, A. Passeri, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, B. Shwartz, F. Simon, J. B. Singh, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, R. Van Tonder, G. Varner, A. Vinokurova, A. Vossen, E. Waheed, C. H. Wang, D. Wang, E. Wang, M.-Z. Wang, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Y. Zhai, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov
Subjects: e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present a search for the charged lepton-flavor-violating decays ϒ(1S) → ℓ ± ℓ′∓ and radiative charged lepton-flavour-violating decays ϒ(1S) → γ ℓ ± ℓ′∓ [ℓ,ℓ′ = e, μ, τ] using the 158 million ϒ(2S) sample collected by the Belle detector at the KEKB collider. This search uses ϒ(1S) mesons produced in ϒ(2S) → π + π − ϒ(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.
Published: 2022
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20. An improved search for the electric dipole moment of the τ lepton

Author: The BELLE collaboration, K. Inami, K. Hayasaka, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, M. Bessner, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, G. De Nardo, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, S. Dubey, S. Eidelman, D. Epifanov, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, D. Greenwald, K. Gudkova, C. Hadjivasiliou, O. Hartbrich, H. Hayashii, M. T. Hedges, W.-S. Hou, C.-L. Hsu, T. Iijima, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, Y. Jin, C. W. Joo, K. K. Joo, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, S. H. Kim, Y.-K. Kim, T. D. Kimmel, K. Kinoshita, P. Kodyš, T. Konno, S. Korpar, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, M. Kumar, R. Kumar, K. Kumara, Y.-J. Kwon, K. Lalwani, J. S. Lange, S. C. Lee, C. H. Li, J. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, S. Mohanty, T. J. Moon, M. Nakao, A. Natochii, L. Nayak, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, S.-H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, A. Rabusov, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, J.-G. Shiu, B. Shwartz, F. Simon, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, K. Sumisawa, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, Y. Tao, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, S. Uno, Y. Ushiroda, R. Van Tonder, G. Varner, A. Vinokurova, C. H. Wang, E. Wang, P. Wang, M. Watanabe, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. H. Yin, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: e +-e − Experiments, Tau Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: 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 d τ as Re(d τ ) = (−0.62 ± 0.63) × 10 −17 ecm and Im(d τ ) = (−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.
Published: 2022
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21. B-flavor tagging at Belle II

Author: F. Abudinén, N. Akopov, A. Aloisio, V. Babu, Sw. Banerjee, M. Bauer, J. V. Bennett, F. U. Bernlochner, M. Bessner, S. Bettarini, T. Bilka, S. Bilokin, D. Biswas, D. Bodrov, J. Borah, M. Bračko, P. Branchini, A. Budano, M. Campajola, G. Casarosa, C. Cecchi, R. Cheaib, V. Chekelian, C. Chen, Y. Q. Chen, H. -E. Cho, S. Cunliffe, G. De Nardo, G. De Pietro, R. de Sangro, S. Dey, A. Di Canto, F. Di Capua, T. V. Dong, G. Dujany, P. Ecker, M. Eliachevitch, T. Ferber, F. Forti, E. Ganiev, A. Gaz, M. Gelb, J. Gemmler, R. Godang, P. Goldenzweig, E. Graziani, K. Hara, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hohmann, T. Humair, G. Inguglia, H. Junkerkalefeld, R. Karl, Y. Kato, T. Keck, C. Kiesling, C. -H. Kim, S. Kohani, I. Komarov, T. M. G. Kraetzschmar, P. Križan, J. F. Krohn, T. Kuhr, J. Kumar, K. Kumara, S. Kurz, S. Lacaprara, C. La Licata, M. Laurenza, K. Lautenbach, S. C. Lee, K. Lieret, L. Li Gioi, Q. Y. Liu, S. Longo, M. Maggiora, E. Manoni, C. Marinas, A. Martini, F. Meier, M. Merola, F. Metzner, M. Milesi, K. Miyabayashi, G. B. Mohanty, F. Mueller, C. Murphy, E. R. Oxford, S. -H. Park, A. Passeri, F. Pham, L. E. Piilonen, S. Pokharel, M. T. Prim, C. Pulvermacher, P. Rados, M. Ritter, A. Rostomyan, S. Sandilya, L. Santelj, Y. Sato, A. J. Schwartz, M. E. Sevior, A. Soffer, S. Spataro, R. Stroili, W. Sutcliffe, D. Tagnani, M. Takizawa, U. Tamponi, F. Tenchini, E. Torassa, P. Urquijo, L. Vitale, Y. Yusa, L. Zani, Q. D. Zhou, R. Žlebčík, and A. Zupanc
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( ) mesons at Belle II. The algorithms provide essential inputs for measurements of quark-flavor mixing and charge-parity violation. We validate and evaluate the performance of the algorithms using hadronic decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb $$^{-1}$$ - 1 , collected at the resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (30.0 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$ ε eff = ( 30.0 ± 1.2 ( stat ) ± 0.4 ( syst ) ) % for a category-based algorithm and $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (28.8 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$ ε eff = ( 28.8 ± 1.2 ( stat ) ± 0.4 ( syst ) ) % for a deep-learning-based algorithm.
Published: 2022
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22. First measurement of the Λ c + $$ {\Lambda}_c^{+} $$ → pη′ decay

Author: The BELLE collaboration, S. X. Li, J. X. Cui, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, P. Behera, K. Belous, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Giri, P. Goldenzweig, B. Golob, E. Graziani, T. Gu, T. Hara, K. Hayasaka, H. Hayashii, W.-S. Hou, K. Inami, A. Ishikawa, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, M. Kumar, R. Kumar, K. Kumara, Y.-J. Kwon, T. Lam, M. Laurenza, S. C. Lee, J. Li, L. K. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, A. Martini, M. Masuda, T. Matsuda, D. Matvienko, S. K. Maurya, F. Meier, M. Merola, K. Miyabayashi, R. Mizuk, R. Mussa, M. Nakao, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, S.-H. Park, S. Patra, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, V. Shebalin, J.-G. Shiu, B. Shwartz, F. Simon, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, M. Sumihama, K. Sumisawa, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, Y. Unno, K. Uno, S. Uno, P. Urquijo, S. E. Vahsen, R. Van Tonder, G. Varner, A. Vinokurova, E. Waheed, D. Wang, E. Wang, M.-Z. Wang, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, H. Ye, J. H. Yin, Y. Yusa, Y. Zhai, V. Zhilich, and V. Zhukova
Subjects: Branching fraction, e +-e − Experiments, Charm Physics, Particle and Resonance Production, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λ c + $$ {\Lambda}_c^{+} $$ → pη′ with η′ → ηπ + π − , using a data sample corresponding to an integrated luminosity of 981 fb −1, collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. A significant Λ c + $$ {\Lambda}_c^{+} $$ → pη′ signal is observed for the first time with a signal significance of 5.4σ. The relative branching fraction with respect to the normalization mode Λ c + $$ {\Lambda}_c^{+} $$ → pK − π + is measured to be B Λ c + → pη ′ B Λ c + → pK − π + = 7.54 ± 1.32 ± 0.73 × 10 − 3 , $$ \frac{\mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)}{\mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right)}=\left(7.54\pm 1.32\pm 0.73\right)\times {10}^{-3}, $$ where the uncertainties are statistical and systematic, respectively. Using the world-average value of B Λ c + → pK − π + $$ \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) $$ = (6.28 ± 0.32) × 10 −2, we obtain B Λ c + → pη ′ = 4.73 ± 0.82 ± 0.46 ± 0.24 × 10 − 4 , $$ \mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)=\left(4.73\pm 0.82\pm 0.46\pm 0.24\right)\times {10}^{-4}, $$ where the uncertainties are statistical, systematic, and from B Λ c + → pK − π + $$ \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) $$ , respectively.
Published: 2022
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23. Combined analysis of Belle and Belle II data to determine the CKM angle ϕ 3 using B + → D( K S 0 $$ {K}_S^0 $$ h + h − )h + decays

Author: The Belle and Belle II collaborations, F. Abudinén, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, S. Al Said, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aushev, R. Ayad, V. Babu, S. Bacher, S. Baehr, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, J. Baudot, J. Becker, P. K. Behera, K. Belous, J. V. Bennett, F. U. Bernlochner, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, D. Červenkov, P. Cheema, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, L. Corona, S. Cunliffe, T. Czank, S. Das, F. Dattola, E. De La Cruz-Burelo, G. de Marino, S. K. Maurya, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, R. Dhamija, A. Di Canto, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, D. Dossett, S. Dubey, G. Dujany, M. Eliachevitch, D. Epifanov, P. Feichtinger, D. Ferlewicz, T. Fillinger, S. Fiore, A. Fodor, F. Forti, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, V. Gaur, A. Gaz, R. Giordano, A. Giri, A. Glazov, R. Godang, P. Goldenzweig, B. Golob, W. Gradl, E. Graziani, D. Greenwald, T. Gu, Y. Guan, K. Gudkova, J. Guilliams, C. Hadjivasiliou, S. Halder, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, S. Hazra, I. Heredia de la Cruz, A. Hershenhorn, T. Higuchi, E. C. Hill, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, A. Ishikawa, M. Iwasaki, W. W. Jacobs, E.-J. Jang, Y. Jin, H. Junkerkalefeld, A. B. Kaliyar, K. H. Kang, R. Karl, G. Karyan, Y. Kato, C. Ketter, C. Kiesling, C.-H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, S. Korpar, E. Kovalenko, T. M. G. Kraetzschmar, P. Križan, P. Krokovny, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, C. La Licata, L. Lanceri, J. S. Lange, R. Leboucher, S. C. Lee, P. Leitl, J. Li, S. X. Li, L. Li Gioi, J. Libby, K. Lieret, Z. Liptak, Q. Y. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, M. Maggiora, R. Maiti, S. Maity, R. Manfredi, E. Manoni, S. Marcello, A. Martini, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, J. A. McKenna, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, H.-G. Moser, F. Mueller, C. Murphy, R. Mussa, K. R. Nakamura, T. Nakano, M. Nakao, M. Naruki, D. Narwal, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, N. K. Nisar, S. Nishida, K. Nishimura, Y. Onishchuk, H. Ono, P. Oskin, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, K. Parham, S.-H. Park, A. Passeri, A. Pathak, S. Patra, R. Pestotnik, L. E. Piilonen, T. Podobnik, S. Pokharel, L. Polat, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, A. Rabusov, P. Rados, S. Raiz, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, L. B. Rizzuto, S. H. Robertson, M. Röhrken, J. M. Roney, A. Rostomyan, N. Rout, D. Sahoo, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, G. Schnell, J. Schueler, A. J. Schwartz, Y. Seino, A. Selce, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, T. Shillington, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, A. Soffer, E. Solovieva, S. Spataro, B. Spruck, S. Stefkova, Z. S. Stottler, R. Stroili, K. Sumisawa, W. Sutcliffe, S. Y. Suzuki, M. Tabata, M. Takizawa, K. Tanida, F. Tenchini, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, M. Uchida, I. Ueda, T. Uglov, K. Uno, S. Uno, Y. Ushiroda, S. E. Vahsen, R. van Tonder, K. E. Varvell, A. Vinokurova, L. Vitale, H. M. Wakeling, E. Wang, M.-Z. Wang, X. L. Wang, A. Warburton, S. Watanuki, O. Werbycka, C. Wessel, E. Won, B. D. Yabsley, W. Yan, H. Ye, K. Yoshihara, Y. Yusa, L. Zani, Y. Zhai, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, and V. I. Zhukova
Subjects: B Physics, CKM Angle Gamma, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle ϕ 3 (also known as γ) using a model-independent Dalitz plot analysis of B + → D ( K S 0 $$ {K}_S^0 $$ h + h − )h +, where D is either a D 0 or D ¯ $$ \overline{D} $$ 0 meson and h is either a π or K. This is the first measurement that simultaneously uses Belle and Belle II data, combining samples corresponding to integrated luminosities of 711 fb −1 and 128 fb −1, respectively. All data were accumulated from energy-asymmetric e + e − collisions at a centre-of-mass energy corresponding to the mass of the Υ(4S) resonance. We measure ϕ 3 = (78.4 ± 11.4 ± 0.5 ± 1.0)°, where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is from the uncertainties on external measurements of the D-decay strong-phase parameters.
Published: 2022
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24. Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle

Author: The BELLE collaboration, K. Uno, K. Hayasaka, K. Inami, I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, J. Bennett, F. Bernlochner, M. Bessner, V. Bhardwaj, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, M. Campajola, D. Červenkov, M.-C. Chang, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, T. Ferber, A. Frey, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, C. Hadjivasiliou, T. Hara, O. Hartbrich, H. Hayashii, M. Hernandez Villanueva, W.-S. Hou, C.-L. Hsu, T. Iijima, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, Y. Jin, K. K. Joo, K. H. Kang, Y. Kato, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, S. H. Kim, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, Y.-T. Lai, J. S. Lange, S. C. Lee, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, C. MacQueen, M. Masuda, K. Matsuoka, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, M. Nakao, H. Nakazawa, A. Natochii, L. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Ogawa, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Paul, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, C. Sharma, C. P. Shen, J.-G. Shiu, B. Shwartz, F. Simon, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, K. Tanida, Y. Tao, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, S. E. Vahsen, R. Van Tonder, G. Varner, A. Vinokurova, A. Vossen, E. Waheed, C. H. Wang, E. Wang, M.-Z. Wang, X. L. Wang, O. Werbycka, E. Won, B. D. Yabsley, W. Yan, H. Ye, J. H. Yin, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ ± → ℓ ± γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ ± → ℓ ± γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb −1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B $$ \mathcal{B} $$ (τ ± → μ ± γ) ≤ 4.2 × 10 −8 and B $$ \mathcal{B} $$ (τ ± → e ± γ) ≤ 5.6 × 10 −8, are set at 90% confidence level.
Published: 2021
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25. Measurement of branching fractions and search for CP violation in D 0 → π + π − η, D 0 → K + K − η, and D 0 → ϕη at Belle

Author: The Belle collaboration, L. K. Li, A. J. Schwartz, K. Kinoshita, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, J. Bennett, M. Bessner, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, A. Chen, Y. Q. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, A. Giri, P. Goldenzweig, B. Golob, E. Graziani, T. Gu, Y. Guan, C. Hadjivasiliou, S. Halder, K. Hayasaka, W.-S. Hou, K. Inami, A. Ishikawa, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, K. H. Kang, G. Karyan, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, S. H. Kim, Y.-K. Kim, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, M. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, K. Lalwani, M. Laurenza, S. C. Lee, C. H. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, M. Masuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, T. Mori, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, S.-H. Park, A. Passeri, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, K. Uno, S. Uno, S. E. Vahsen, R. Van Tonder, G. Varner, A. Vinokurova, E. Waheed, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, S. Watanuki, E. Won, B. D. Yabsley, W. B. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: Branching fraction, Charm physics, CP violation, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D 0 → π + π − η, D 0 → K + K − η, and D 0 → ϕη, using 980 fb −1 of data from the Belle experiment at the KEKB e + e − collider. We obtain B D 0 → π + π − η = 1.22 ± 0.02 stat ± 0.02 syst ± 0.03 B ref × 10 − 3 , B D 0 → K + K − η = 1.80 − 0.06 + 0.07 stat ± 0.04 syst ± 0.05 B ref × 10 − 4 , B D 0 → ϕη = 1.84 ± 0.09 stat ± 0.06 syst ± 0.05 B ref × 10 − 4 , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({D}^0\to {\pi}^{+}{\pi}^{-}\eta \right)=\left[1.22\pm 0.02\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right)\pm 0.03\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-3},\\ {}\mathcal{B}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[{1.80}_{-0.06}^{+0.07}\left(\mathrm{stat}\right)\pm 0.04\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\\ {}\mathcal{B}\left({D}^0\to \phi \eta \right)=\left[1.84\pm 0.09\left(\mathrm{stat}\right)\pm 0.06\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\end{array}} $$ where the third uncertainty ( B $$ \mathcal{B} $$ ref) is from the uncertainty in the branching fraction of the reference mode D 0 → K − π + η. The color-suppressed decay D 0 → ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are A CP D 0 π + π − η = 0.9 ± 1.2 stat ± 0.5 syst % , A CP D 0 → K + K − η = − 1.4 ± 3.3 stat ± 1.1 syst % , ACP D 0 → ϕη = − 1.9 ± 4.4 stat ± 0.6 syst % . $$ {\displaystyle \begin{array}{c}{A}_{CP}\left({D}^0\ {\pi}^{+}{\pi}^{-}\eta \right)=\left[0.9\pm 1.2\left(\mathrm{stat}\right)\pm 0.5\left(\mathrm{syst}\right)\right]\%,\\ {}{A}_{CP}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[-1.4\pm 3.3\left(\mathrm{stat}\right)\pm 1.1\left(\mathrm{syst}\right)\right]\%,\\ {} ACP\ \left({D}^0\to \phi \eta \right)=\left[-1.9\pm 4.4\left(\mathrm{stat}\right)\pm 0.6\left(\mathrm{syst}\right)\right]\%.\end{array}} $$ The results for D 0 → π + π − η are a significant improvement over previous results. The branching fraction and A CP results for D 0 → K + K − η, and the ACP result for D 0 → ϕη, are the first such measurements. No evidence for CP violation is found in any of these decays.
Published: 2021
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26. Measurements of branching fractions and asymmetry parameters of Ξ c 0 → Λ K ¯ ∗ 0 $$ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $$ , Ξ c 0 → Σ 0 K ¯ ∗ 0 $$ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $$ , and Ξ c 0 → Σ + K ∗ − $$ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $$ decays at Belle

Author: The Belle collaboration, S. Jia, S. S. Tang, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, J. Bennett, M. Bessner, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, M.-C. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, G. De Nardo, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, T. Ferber, K. Flood, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, O. Hartbrich, K. Hayasaka, H. Hayashii, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, Y. Jin, K. K. Joo, G. Karyan, Y. Kato, H. Kichimi, C. H. Kim, D. Y. Kim, K.-H. Kim, S. H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, K. Kumara, A. Kuzmin, Y.-J. Kwon, K. Lalwani, J. S. Lange, S. C. Lee, J. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, J. T. McNeil, M. Merola, F. Metzner, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, R. Mussa, M. Nakao, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, C. Sharma, J.-G. Shiu, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, S. Uehara, T. Uglov, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Usov, R. Van Tonder, G. Varner, E. Waheed, C. H. Wang, M.-Z. Wang, P. Wang, M. Watanabe, O. Werbycka, E. Won, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: Branching fraction, e +-e − Experiments, Charm physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Using a data sample of 980 fb −1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study the processes of Ξ c 0 → Λ K ¯ ∗ 0 $$ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $$ , Ξ c 0 → Σ 0 K ¯ ∗ 0 $$ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $$ , and Ξ c 0 → Σ + K ∗ − $$ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $$ for the first time. The relative branching ratios to the normalization mode of Ξ c 0 → Ξ − π + $$ {\Xi}_c^0\to {\Xi}^{-}{\pi}^{+} $$ are measured to be B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ − / B Ξ c 0 → Ξ − π + = 0.34 ± 0.06 stat . ± 0.02 syst . , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.18\pm 0.02\left(\mathrm{stat}.\right)\pm 0.01\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.69\pm 0.03\left(\mathrm{stat}.\right)\pm 0.03\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.34\pm 0.06\left(\mathrm{stat}.\right)\pm 0.02\left(\mathrm{syst}.\right),\end{array}} $$ where the uncertainties are statistical and systematic, respectively. We obtain B Ξ c 0 → Λ K ¯ ∗ 0 = 3.3 ± 0.3 stat . ± 0.2 syst . ± 1.0 ref . × 10 − 3 , B Ξ c 0 → Σ 0 K ¯ ∗ 0 = 12.4 ± 0.5 stat . ± 0.5 syst . ± 3.6 ref . × 10 − 3 , B Ξ c 0 → Σ + K ∗ 0 = 6.1 ± 1.0 stat . ± 0.4 syst . ± 1.8 ref . × 10 − 3 , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)=\left(3.3\pm 0.3\left(\mathrm{stat}.\right)\pm 0.2\left(\mathrm{syst}.\right)\pm 1.0\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)=\left(12.4\pm 0.5\left(\mathrm{stat}.\right)\pm 0.5\left(\mathrm{syst}.\right)\pm 3.6\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast 0}\right)=\left(6.1\pm 1.0\left(\mathrm{stat}.\right)\pm 0.4\left(\mathrm{syst}.\right)\pm 1.8\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\end{array}} $$ where the uncertainties are statistical, systematic, and from B Ξ c 0 → Ξ − π + $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$ , respectively. The asymmetry parameters α Ξ c 0 → Λ K ¯ ∗ 0 $$ \alpha \left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right) $$ and α Ξ c 0 → Σ + K ∗ − $$ \alpha \left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right) $$ are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.
Published: 2021
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27. Measurement of the energy dependence of the e + e − → B B ¯ $$ B\overline{B} $$ , B B ¯ ∗ $$ B{\overline{B}}^{\ast } $$ and B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ exclusive cross sections

Author: The BELLE collaboration, R. Mizuk, A. Bondar, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, K. Belous, J. Bennett, M. Bessner, T. Bilka, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, M.-C. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, S. Eidelman, D. Epifanov, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, A. Garmash, P. Goldenzweig, B. Golob, C. Hadjivasiliou, K. Hayasaka, H. Hayashii, M. T. Hedges, W.-S. Hou, C.-L. Hsu, K. Huang, T. Iijima, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, G. Karyan, T. Kawasaki, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, S. H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, K. Kumara, A. Kuzmin, Y.-J. Kwon, S. C. Lee, P. Lewis, J. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, G. B. Mohanty, M. Mrvar, R. Mussa, M. Nakao, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, K. Senyo, C. Sharma, C. P. Shen, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, K. Uno, S. Uno, Y. Usov, R. Van Tonder, G. Varner, E. Waheed, C. H. Wang, M.-Z. Wang, P. Wang, M. Watanabe, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. H. Yin, C. Z. Yuan, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: e +-e − Experiments, Particle and resonance production, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report the first measurement of the exclusive cross sections e + e − → B B ¯ $$ B\overline{B} $$ , e + e − → B B ¯ ∗ $$ B{\overline{B}}^{\ast } $$ , and e + e − → B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ in the energy range from 10.63 GeV to 11.02 GeV. The B mesons are fully reconstructed in a large number of hadronic final states and the three channels are identified using a beam-constrained-mass variable. The shapes of the exclusive cross sections show oscillatory behavior with several maxima and minima. The results are obtained using data collected by the Belle experiment at the KEKB asymmetric-energy e + e − collider.
Published: 2021
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28. Search for the dark photon in B 0 → A′A′, A′ → e + e − , μ + μ − , and π + π − decays at Belle

Author: The BELLE collaboration, S.-H. Park, Y.-J. Kwon, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, P. Behera, J. Bennett, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, M.-C. Chang, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, Y. Guan, K. Gudkova, C. Hadjivasiliou, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, M. T. Hedges, M. Hernandez Villanueva, W.-S. Hou, C.-L. Hsu, K. Huang, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, E.-J. Jang, H. B. Jeon, S. Jia, Y. Jin, C. W. Joo, K. K. Joo, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, D. Y. Kim, K.-H. Kim, S. H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, M. Kumar, K. Kumara, K. Lalwani, I. S. Lee, S. C. Lee, C. H. Li, J. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, Z. Liptak, D. Liventsev, T. Luo, J. MacNaughton, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, S. Mohanty, T. Mori, H.-G. Moser, M. Mrvar, R. Mussa, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, C. W. Park, H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Ritter, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, Y. Sakai, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, J. F. Strube, M. Sumihama, K. Sumisawa, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, S. E. Vahsen, R. Van Tonder, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, E. Waheed, C. H. Wang, E. Wang, M.-Z. Wang, P. Wang, M. Watanabe, S. Watanuki, S. Wehle, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov
Subjects: B physics, Beyond Standard Model, e+-e- Experiments, Rare decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present a search for the dark photon A′ in the B 0 → A′A′ decays, where A′ subsequently decays to e + e − , μ + μ − , and π + π − . The search is performed by analyzing 772 × 106 B B ¯ $$ B\overline{B} $$ events collected by the Belle detector at the KEKB e + e − energy-asymmetric collider at the ϒ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c 2 ≤ m A′ ≤ 2.62 GeV/c 2, and we set upper limits of the branching fraction of B 0 → A′A′ at the 90% confidence level. The products of branching fractions, ℬ B 0 → A ′ A ′ × ℬ A ′ → e + e − 2 $$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right)\times \mathrm{\mathcal{B}}{\left(A\prime \to {e}^{+}{e}^{-}\right)}^2 $$ and ℬ B 0 → A ′ A ′ × ℬ A ′ → μ + μ − 2 $$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right)\times \mathrm{\mathcal{B}}{\left(A\prime \to {\mu}^{+}{\mu}^{-}\right)}^2 $$ , have limits of the order of 10 −8 depending on the A′ mass. Furthermore, considering A′ decay rate to each pair of charged particles, the upper limits of ℬ B 0 → A ′ A ′ $$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right) $$ are of the order of 10 −8–10 −5. From the upper limits of ℬ B 0 → A ′ A ′ $$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right) $$ , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10 −2–10 −1 at m h ′ ≃ m B 0 $$ {m}_{h\prime}\simeq {m}_{B^0} $$ ± 40 MeV/c 2 and 10 −1–1 at m h ′ ≃ m B 0 $$ {m}_{h\prime}\simeq {m}_{B^0} $$ ± 3 GeV/c 2.
Published: 2021
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29. Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

Author: The BELLE collaboration, S. Choudhury, S. Sandilya, K. Trabelsi, A. Giri, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, C. Beleño, K. Belous, J. Bennett, F. Bernlochner, M. Bessner, V. Bhardwaj, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Dossett, S. Dubey, S. Eidelman, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, B. Golob, D. Greenwald, C. Hadjivasiliou, O. Hartbrich, H. Hayashii, M. T. Hedges, M. Hernandez Villanueva, T. Higuchi, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, H. B. Jeon, S. Jia, Y. Jin, C. W. Joo, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, G. Karyan, H. Kichimi, C. Kiesling, B. H. Kim, D. Y. Kim, K.-H. Kim, K. T. Kim, S. H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, K. Lalwani, S. C. Lee, P. Lewis, C. H. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, Z. Liptak, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, S. Mohanty, T. J. Moon, T. Mori, I. Nakamura, K. R. Nakamura, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, A. Rabusov, A. Rostomyan, N. Rout, M. Rozanska, G. Russo, D. Sahoo, Y. Sakai, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, V. Shebalin, J.-G. Shiu, B. Shwartz, F. Simon, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, R. Van Tonder, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, E. Waheed, C. H. Wang, E. Wang, M.-Z. Wang, P. Wang, M. Watanabe, S. Watanuki, S. Wehle, J. Wiechczynski, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: FCNC Interaction, Flavor physics, Flavour Changing Neutral Currents, B physics, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present measurements of the branching fractions for the decays B → Kμ + μ − and B → Ke + e − , and their ratio (R K ), using a data sample of 711 fb −1 that contains 772 × 106 B B ¯ $$ B\overline{B} $$ events. The data were collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. The ratio R K is measured in five bins of dilepton invariant-mass-squared (q 2): q 2 ∈ (0.1, 4.0), (4.00, 8.12), (1.0, 6.0), (10.2, 12.8) and (> 14.18) GeV2 /c 4, along with the whole q 2 region. The R K value for q 2 ∈ (1.0, 6.0) GeV2 /c 4 is 1.03 − 0.24 + 0.28 $$ {1.03}_{-0.24}^{+0.28} $$ ± 0.01. The first and second uncertainties listed are statistical and systematic, respectively. All results for R K are consistent with Standard Model predictions. We also measure CP-averaged isospin asymmetries in the same q 2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q 2 ∈ (1.0, 6.0) GeV2 /c 4 bin in the mode with muon final states. The measured differential branching fractions, d ℬ $$ d\mathrm{\mathcal{B}} $$ /dq 2, are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kμ ± e ∓ decays and set 90% confidence-level upper limits on the branching fraction in the range of 10 −8 for B + → K + μ ± e ∓, and B 0 → K 0 μ ± e ∓ modes.
Published: 2021
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30. First search for the η c2(1D) in B decays at Belle

Author: The Belle collaboration, K. Chilikin, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, C. Beleño, K. Belous, J. Bennett, V. Bhardwaj, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, M.-C. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, F. Di Capua, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, O. Grzymkowska, O. Hartbrich, K. Hayasaka, H. Hayashii, M. Hernandez Villanueva, W.-S. Hou, C.-L. Hsu, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, G. Karyan, Y. Kato, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, S. H. Kim, Y.-K. Kim, T. D. Kimmel, K. Kinoshita, P. Kodyš, S. Korpar, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, A. Kuzmin, Y.-J. Kwon, K. Lalwani, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, T. J. Moon, T. Mori, M. Mrvar, R. Mussa, M. Nakao, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Ritter, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, Y. Sakai, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, M. Shapkin, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, K. Sumisawa, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, A. Vinokurova, V. Vorobyev, C. H. Wang, E. Wang, M.-Z. Wang, P. Wang, M. Watanabe, S. Watanuki, E. Won, X. Xu, W. Yan, S. B. Yang, H. Ye, J. H. Yin, C. Z. Yuan, J. Zhang, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov
Subjects: e +-e − Experiments, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract The first dedicated search for the η c2(1D) is carried out using the decays B + → η c2(1D)K +, B 0 → η c2(1D) K S 0 $$ {K}_S^0 $$ , B 0 → η c2(1D)π − K +, and B + → η c2(1D)π + K S 0 $$ {K}_S^0 $$ with η c2(1D) → h c γ. No significant signal is found. For the η c2(1D) mass range between 3795 and 3845 MeV/c 2, the branching-fraction upper limits are determined to be ℬ(B + → η c2(1D)K +) × ℬ(η c2(1D) → h c γ) < 3.7 × 10 −5, ℬ(B 0 → η c2(1D)K 0) × ℬ(η c2(1D) → h c γ) < 3.5 × 10 −5, ℬ(B 0 → η c2(1D)π − K +) × ℬ(η c2(1D) → h c γ) < 1.0 × 10 −4, and ℬ(B + → η c2(1D)π + K S 0 $$ {K}_S^0 $$ ) × ℬ(η c2(1D) → h c γ) < 1.1 × 10 −4 at 90% C.L. The analysis is based on the 711 fb −1 data sample collected on the ϒ(4S) resonance by the Belle detector, which operated at the KEKB asymmetric-energy e + e − collider.
Published: 2020
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31. First measurement of the CKM angle ϕ 3 with B ± → D( K S 0 $$ {K}_{\mathrm{S}}^0 $$ π + π − π 0) K ± decays

Author: The BELLE collaboration, P. K. Resmi, J. Libby, K. Trabelsi, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, V. Babu, I. Badhrees, A. M. Bakich, C. Beleño, J. Bennett, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, A. Bozek, M. Bračko, M. Campajola, D. Červenkov, A. Chen, B. G. Cheon, H. E. Cho, K. Cho, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, F. Di Capua, S. Di Carlo, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, Y. Guan, K. Hayasaka, H. Hayashii, W.-S. Hou, K. Huang, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, H. B. Jeon, Y. Jin, D. Joffe, A. B. Kaliyar, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, D. Y. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, D. Kotchetkov, P. Krǐzan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kumar, A. Kuzmin, Y.-J. Kwon, S. C. Lee, Y. B. Li, K. Lieret, D. Liventsev, P.-C. Lu, T. Luo, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Nakano, M. Nakao, K. J. Nath, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, E. Prencipe, M. T. Prim, M. Ritter, M. Röhrken, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, V. Shebalin, C. P. Shen, J.-G. Shiu, B. Shwartz, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, S. Uno, Y. Usov, R. Van Tonder, G. Varner, A. Vinokurova, V. Vorobyev, A. Vossen, B. Wang, C. H. Wang, M.-Z. Wang, X. L. Wang, S. Watanuki, E. Won, S. B. Yang, H. Ye, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: CKM angle gamma, CP violation, e+-e- Experiments, B physics, Flavor physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present the first model-independent measurement of the CKM unitarity triangle angle ϕ 3 using B ± → D( K S 0 $$ {K}_{\mathrm{S}}^0 $$ π + π − π 0) K ± decays, where D indicates either a D 0 or D ¯ $$ \overline{D} $$ 0 meson. Measurements of the strong-phase difference of the D → K S 0 $$ {K}_{\mathrm{S}}^0 $$ π + π − π 0 amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of 772 × 106 B B ¯ $$ \overline{B} $$ events collected at the Υ(4S) resonance. We obtain ϕ 3 = ( 5.7 − 8.8 + 10.2 $$ {5.7}_{-8.8}^{+10.2} $$ ±3.5±5.7) ° and the suppressed amplitude ratio r B = 0.323±0.147±0.023±0.051. Here the first uncertainty is statistical, the second is the experimental systematic, and the third is due to the precision of the strong-phase parameters measured from CLEO-c data. The 95% confidence interval on ϕ 3 is (−29.7, 109.5) ° , which is consistent with the current world average.
Published: 2019
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32. Observation of a new structure near 10.75 GeV in the energy dependence of the e + e − → ϒ (nS)π + π − (n = 1, 2, 3) cross sections

Author: The BELLE collaboration, R. Mizuk, A. Bondar, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, I. Badhrees, S. Bahinipati, A. M. Bakich, P. Behera, C. Beleño, M. Berger, V. Bhardwaj, T. Bilka, J. Biswal, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, F. Di Capua, S. Di Carlo, Z. Doležal, T.V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, O. Grzymkowska, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, Y. Jin, D. Joffe, K. K. Joo, K. H. Kang, G. Karyan, T. Kawasaki, H. Kichimi, D. Y. Kim, H. J. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kumar, A. Kuzmin, J. S. Lange, J. Y. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, T. Luo, J. MacNaughton, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, H. Miyata, G. B. Mohanty, T. Mori, R. Mussa, T. Nakano, M. Nakao, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, S. L. Olsen, H. Ono, Y. Onuki, P. Oskin, W. Ostrowicz, P. Pakhlov, G. Pakhlova, B. Pal, T. Pang, S. Pardi, S.-H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, M. Ritter, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, S. E. Vahsen, R. Van Tonder, G. Varner, A. Vinokurova, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, E. Won, S. B. Yang, H. Ye, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova
Subjects: e+-e- Experiments, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report a new measurement of the e + e − → ϒ(nS)π + π − (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be M = 10752.7 ± 5.9 − 1.1 + 0.7 MeV / c 2 $$ M=\left(10752.7\pm {5.9}_{-1.1}^{+0.7}\right)\mathrm{MeV}/{c}^2 $$ and Γ = 35.5 − 11.3 − 3.3 + 17.6 + 3.9 $$ \Gamma =\left({35.5}_{-11.3\kern0.5em -3.3}^{+17.6+3.9}\right) $$ MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e + e − → ϒ (1S)π + π − process at the energy 10.52 GeV, which is below the B B ¯ $$ \overline{B} $$ threshold.
Published: 2019
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33. Evidence of a structure in $$\bar{K}^{0} \Lambda _{c}^{+}$$ K¯0Λc+ consistent with a charged $$\Xi _c(2930)^{+}$$ Ξc(2930)+ , and updated measurement of $$\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B¯0→K¯0Λc+Λ¯c- at Belle

Author: Y. B. Li, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, Y. Ban, V. Bansal, P. Behera, C. Beleño, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, L. Cao, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, J. Dingfelder, Z. Doležal, T. V. Dong, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, B. Golob, J. Haba, K. Hayasaka, S. Hirose, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, K. H. Kang, Y. Kato, T. Kawasaki, D. Y. Kim, J. B. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, Y.-J. Kwon, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, H. K. Moon, T. Mori, R. Mussa, E. Nakano, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Okuno, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, T.-A. Shibata, J.-G. Shiu, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, C. Van Hulse, R. Van Tonder, G. Varner, K. E. Varvell, V. Vorobyev, E. Waheed, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, S. Watanuki, E. Widmann, E. Won, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report evidence for the charged charmed-strange baryon $$\Xi _{c}(2930)^+$$ Ξc(2930)+ with a signal significance of 3.9$$\sigma $$ σ with systematic errors included. The charged $$\Xi _{c}(2930)^+$$ Ξc(2930)+ is found in its decay to $$K_{S}^{0} \Lambda _{c}^+$$ KS0Λc+ in the substructure of $$\bar{B}^{0} \rightarrow K^{0}_{S} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are $$[2942.3 \pm 4.4 ({\mathrm{stat.}}) \pm {1.5}({\mathrm{syst.}})]$$ [2942.3±4.4(stat.)±1.5(syst.)] MeV/$$c^{2}$$ c2 and $$[14.8 \pm 8.8({\mathrm{stat.}}) \pm {2.5}({\mathrm{syst.}})]$$ [14.8±8.8(stat.)±2.5(syst.)] MeV, respectively, and the product branching fraction is $$\mathcal{B}(\bar{B}^{0} \rightarrow \Xi _c(2930)^{+} \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _c(2930)^{+}\rightarrow \bar{K}^{0} \Lambda _{c}^{+})=[2.37 \pm 0.51 ({\mathrm{stat.}})\pm 0.31({\mathrm{syst.}})]\times 10^{-4}$$ B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4 . We also measure $$\mathcal{B}(\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [3.99 \pm 0.76({\mathrm{stat.}}) \pm 0.51({\mathrm{syst.}})] \times 10^{-4}$$ B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner, $$Y_{\eta }$$ Yη , in the $$\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}$$ Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) or $$Y_{\eta }$$ Yη are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772\pm 11)\times 10^{6} B\bar{B}$$ (772±11)×106BB¯ pairs collected at the $$\Upsilon (4S)$$ Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.
Published: 2018
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34. Inclusive study of bottomonium production in association with an $$\eta $$ η meson in $$e^+e^-$$ e+e- annihilations near $$\varUpsilon (5S)$$ Υ(5S)

Author: U. Tamponi, E. Guido, R. Mussa, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, V. Bansal, E. Barberio, P. Behera, M. Berger, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, Y. Choi, D. Cinabro, S. Cunliffe, T. Czank, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, P. Goldenzweig, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, W.-S. Hou, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, I. Jaegle, H. B. Jeon, Y. Jin, K. K. Joo, T. Julius, K. H. Kang, T. Kawasaki, H. Kichimi, D. Y. Kim, H. J. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, Y.-J. Kwon, I. S. Lee, S. C. Lee, L. K. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, S. Okuno, H. Ono, Y. Onuki, P. Pakhlov, G. Pakhlova, B. Pal, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, M. Ritter, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, T.-A. Shibata, N. Shimizu, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, C. Van Hulse, G. Varner, A. Vinokurova, V. Vorobyev, A. Vossen, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, E. Widmann, E. Won, H. Ye, C. Z. Yuan, Y. Yusa, S. Zakharov, Z. P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov, and A. Zupanc
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We study bottomonium production in association with an $$\eta $$ η meson in $$e^+e^-$$ e+e- annihilations near the $$\varUpsilon (5S)$$ Υ(5S) , at a centre-of-mass energy of $$\sqrt{s}=10.866$$ s=10.866 GeV. The results are based on the 121.4 fb$$^{-1}$$ -1 data sample collected by the Belle experiment at the asymmetric-energy KEKB collider. Only the $$\eta $$ η meson is reconstructed and the missing-mass spectrum of $$\eta $$ η candidates is investigated. We observe the $$e^+e^-\rightarrow \eta \varUpsilon _J(1D)$$ e+e-→ηΥJ(1D) process and find evidence for the $$e^+e^-\rightarrow \eta \varUpsilon (2S)$$ e+e-→ηΥ(2S) process, while no significant signals of $$\varUpsilon (1S)$$ Υ(1S) , $$h_b(1P)$$ hb(1P) , nor $$h_b(2P)$$ hb(2P) are found. Cross sections for the studied processes are reported.
Published: 2018
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35. Observation of $$\Xi _{c}(2930)^0$$ Ξc(2930)0 and updated measurement of $$B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B-→K-Λc+Λ¯c- at Belle

Author: Y. B. Li, C. P. Shen, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, Y. Ban, V. Bansal, P. Behera, M. Berger, V. Bhardwaj, B. Bhuyan, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, E. Guido, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, K. K. Joo, T. Julius, G. Karyan, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, T. Kumita, A. Kuzmin, Y.-J. Kwon, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, M. Mrvar, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, S. Nishida, S. Ogawa, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, C. W. Park, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, V. Shebalin, T.-A. Shibata, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, C. Van Hulse, G. Varner, V. Vorobyev, A. Vossen, E. Waheed, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, E. Widmann, E. Won, H. Ye, J. Yelton, C. Z. Yuan, Y. Yusa, S. Zakharov, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report the first observation of the $$\Xi _{c}(2930)^0$$ Ξc(2930)0 charmed-strange baryon with a significance greater than 5$$\sigma $$ σ . The $$\Xi _{c}(2930)^0$$ Ξc(2930)0 is found in its decay to $$K^- \Lambda _{c}^+$$ K-Λc+ in $$B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B-→K-Λc+Λ¯c- decays. The measured mass and width are $$[2928.9 \pm 3.0(\mathrm stat.)^{+0.9}_{-12.0}(\mathrm syst.)]$$ [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/$$c^{2}$$ c2 and $$[19.5 \pm 8.4(\mathrm stat.) ^{+5.9}_{-7.9}(\mathrm syst.)]$$ [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is $$\mathcal{B}(B^{-} \rightarrow \Xi _{c}(2930)^0 \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _{c}(2930)^0 \rightarrow K^- \Lambda _{c}^{+})=[1.73 \pm 0.45(\mathrm stat.) \pm 0.21(\mathrm syst.)]\times 10^{-4}$$ B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4 . We also measure $$\mathcal{B}(B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [4.80 \pm 0.43(\mathrm stat.) \pm 0.60(\mathrm syst.)] \times 10^{-4}$$ B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, $$Y_{\eta }$$ Yη , in the $$\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}$$ Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772\pm 11)\times 10^{6} B\bar{B}$$ (772±11)×106BB¯ pairs collected at the $$\Upsilon (4S)$$ Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.
Published: 2018
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36. Measurement of branching fractions and search for CP violation in D 0 → π + π − η, D 0 → K + K − η, and D 0 → ϕη at Belle

Author: S. Sandilya, S. Jia, G.V. Russo, A. Kuzmin, A. Korobov, S. Al Said, A. Sangal, E.-J. Jang, W. S. Hou, M. Starič, M. Merola, G. Bonvicini, A. Vinokurova, S. E. Vahsen, K. Senyo, E. Graziani, P. Krokovny, Y. Choi, V. Popov, Yongsun Kim, K. Lalwani, V.N. Zhilich, M. Takizawa, K. H. Kang, K. Cho, S. Uno, C. Schwanda, Y. Iwasaki, John Yelton, G. Schnell, Z. Doležal, G. De Nardo, Y. J. Kwon, W. B. Yan, D. Epifanov, Z. Natkaniec, M. Iwasaki, S. Das, G. De Pietro, L. Nayak, V. Babu, M. Z. Wang, K. Kinoshita, K. Miyabayashi, N. Rout, T. Kuhr, E. Won, V. Gaur, T. K. Pedlar, Antonio Budano, B. G. Cheon, G. B. Mohanty, B. Golob, C. H. Li, T. Gu, L. K. Li, M. Nayak, Y. Yusa, Dipak Kumar Sahoo, F. Tenchini, F. Di Capua, Luka Santelj, S. K. Choi, Seongbae Yang, R. Ayad, T. Ferber, T. Uglov, A. K. Giri, Seema Bahinipati, Prafulla Kumar Behera, Y. Sakai, Shih-Chang Lee, P. Pakhlov, A. Natochii, T. Sumiyoshi, K. Inami, K. Lieret, A. Passeri, K.-H. Kim, J. Biswal, M. Bračko, H. E. Cho, N. K. Nisar, M. Masuda, K. Uno, Felix Metzner, M. Uchida, C. H. Kim, T. Sanuki, Tomoyuki Konno, D. Y. Kim, S.-H. Park, A. Bozek, J. Bennett, E. Prencipe, H. Atmacan, K. K. Joo, L. E. Piilonen, G. S. Varner, P. Oskin, J. G. Shiu, T. V. Dong, S.-J. Cho, A. Chen, N. Dash, C. P. Shen, E. Solovieva, L. Li Gioi, Iki Adachi, Seok Kim, B. G. Fulsom, M. Shapkin, A. J. Schwartz, K. Chilikin, K. Nishimura, M. Laurenza, A. Bobrov, R. Mizuk, M. Campajola, V. Savinov, S. Nishida, S. Cunliffe, M. Sumihama, X. L. Wang, M. C. Chang, V. Chekelian, H. Ono, R. Dhamija, R. Van Tonder, Tagir Aushev, E. Waheed, Samo Korpar, V. Zhukova, C. Sharma, Peter Kodys, W. W. Jacobs, P. L. Wang, V.M. Aulchenko, Y. Unno, Y. Guan, P. Branchini, K. Kumara, G. Karyan, T. Mori, H. Aihara, Z. S. Stottler, S. Watanuki, Z. P. Zhang, G. Pakhlova, H. Ye, M. Niiyama, S. Halder, T. Bilka, T. E. Browder, M. Bessner, C. H. Wang, S. Paul, S. Pardi, B.A. Shwartz, Y. Q. Chen, Bruce Yabsley, Y. Jin, R. Kroeger, P. Goldenzweig, R. Pestotnik, K. Tanida, D. Cinabro, P. Chang, M. Kumar, D. Červenkov, Somnath Choudhury, D. Matvienko, J. Libby, D. M. Asner, J. H. Yin, K. Hayasaka, C. Kiesling, E. Kovalenko, Rocky Bala Garg, Y. Seino, C. Hadjivasiliou, M. T. Prim, D. Liventsev, A. Ishikawa, M. Nakao, P. Križan, Andrey Sokolov, T. Podobnik, Semen Eidelman, Belle, Collaboration, Campajola, M., De Nardo, G., Di Capua, F., Merola, M., Pardi, S., Russo, G., and Et, Al.
Subjects: Physics, Nuclear and High Energy Physics, Charm physic, 010308 nuclear & particles physics, Branching fraction, e, −, e +-e − Experiments, QC770-798, +, 01 natural sciences, Combinatorics, KEKB, CP violation, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, 010306 general physics, Experiments, Charm physics
Abstract: We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D0 → π+π−η, D0 → K+K−η, and D0 → ϕη, using 980 fb−1 of data from the Belle experiment at the KEKB e+e− collider. We obtain$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({D}^0\to {\pi}^{+}{\pi}^{-}\eta \right)=\left[1.22\pm 0.02\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right)\pm 0.03\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-3},\\ {}\mathcal{B}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[{1.80}_{-0.06}^{+0.07}\left(\mathrm{stat}\right)\pm 0.04\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\\ {}\mathcal{B}\left({D}^0\to \phi \eta \right)=\left[1.84\pm 0.09\left(\mathrm{stat}\right)\pm 0.06\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\end{array}} $$ B D 0 → π + π − η = 1.22 ± 0.02 stat ± 0.02 syst ± 0.03 B ref × 10 − 3 , B D 0 → K + K − η = 1.80 − 0.06 + 0.07 stat ± 0.04 syst ± 0.05 B ref × 10 − 4 , B D 0 → ϕη = 1.84 ± 0.09 stat ± 0.06 syst ± 0.05 B ref × 10 − 4 , where the third uncertainty ($$ \mathcal{B} $$ B ref) is from the uncertainty in the branching fraction of the reference mode D0 → K−π+η. The color-suppressed decay D0 → ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are$$ {\displaystyle \begin{array}{c}{A}_{CP}\left({D}^0\ {\pi}^{+}{\pi}^{-}\eta \right)=\left[0.9\pm 1.2\left(\mathrm{stat}\right)\pm 0.5\left(\mathrm{syst}\right)\right]\%,\\ {}{A}_{CP}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[-1.4\pm 3.3\left(\mathrm{stat}\right)\pm 1.1\left(\mathrm{syst}\right)\right]\%,\\ {} ACP\ \left({D}^0\to \phi \eta \right)=\left[-1.9\pm 4.4\left(\mathrm{stat}\right)\pm 0.6\left(\mathrm{syst}\right)\right]\%.\end{array}} $$ A CP D 0 π + π − η = 0.9 ± 1.2 stat ± 0.5 syst % , A CP D 0 → K + K − η = − 1.4 ± 3.3 stat ± 1.1 syst % , ACP D 0 → ϕη = − 1.9 ± 4.4 stat ± 0.6 syst % . The results for D0 → π+π−η are a significant improvement over previous results. The branching fraction and ACP results for D0 → K+K−η, and the ACP result for D0 → ϕη, are the first such measurements. No evidence for CP violation is found in any of these decays.
Published: 2021

37. Measurement of the energy dependence of the e + e − → B B ¯ $$ B\overline{B} $$ , B B ¯ ∗ $$ B{\overline{B}}^{\ast } $$ and B ∗ B ¯ ∗ $$ {B}^{\ast }{\overline{B}}^{\ast } $$ exclusive cross sections

Author: J. G. Shiu, Jochen Dingfelder, W. B. Yan, S. Cunliffe, M. C. Chang, F. Tenchini, T. Sumiyoshi, Iki Adachi, T. Sanuki, S. Jia, Y. B. Li, T. Matsuda, L. E. Piilonen, H. Park, A. Bozek, P. Oskin, B. Golob, P. Lewis, V. Gaur, L. Nayak, V. Babu, Tagir Aushev, Y. Sakai, V. Zhukova, K. Lieret, Y. Iwasaki, M. Nayak, G. Schnell, T. Iijima, J. Biswal, M. Uchida, Y. J. Kwon, Prafulla Kumar Behera, P. Krokovny, Y. Onuki, T. Uglov, A. Sangal, G. B. Mohanty, A.E. Bondar, R. Mussa, A. Ishikawa, T. Ferber, N. Rout, S. Al Said, K. Cho, H. E. Cho, M. Nakao, J. Schueler, E. Won, R. Mizuk, P. Križan, M. Takizawa, M. Röhrken, K. Chilikin, M. Merola, N. Dash, F. Di Capua, T. Kuhr, M. Campajola, V.N. Zhilich, E. Solovieva, D. Epifanov, V.M. Aulchenko, Z. Doležal, T. Pang, S. Patra, A. Kuzmin, E.-J. Jang, G.V. Russo, Tomoyuki Konno, K. Senyo, Yongsun Kim, S. Ogawa, K. Miyabayashi, R. Dhamija, S. Sandilya, T. K. Pedlar, Shih-Chang Lee, S. Das, S. Uno, C. Schwanda, C. Z. Yuan, W. S. Hou, C.-L. Hsu, S.-J. Cho, P. Pakhlov, C. H. Kim, Seongbae Yang, R. Ayad, Seema Bahinipati, S. K. Choi, M. Starič, H. Hayashii, M. Bračko, D. Liventsev, C. P. Shen, G. S. Varner, K. Trabelsi, J. Li, Dipak Kumar Sahoo, Seok Kim, C. Sharma, Peter Kodys, W. W. Jacobs, S.-H. Park, J. Bennett, Luka Santelj, Andrey Sokolov, T. Podobnik, D. Y. Kim, E. Prencipe, R. Itoh, H. Kichimi, K. Nishimura, Felix Metzner, A. Rostomyan, K. Huang, E. Waheed, G. De Nardo, M. T. Hedges, B. G. Fulsom, L. Li Gioi, G. Karyan, A. Korobov, Semen Eidelman, A. Natochii, H. Ono, N. K. Nisar, H. Atmacan, K. Uno, X. P. Xu, M. Z. Wang, K. Kinoshita, Y. Choi, V. Popov, S. Watanuki, M. Masuda, S. Nishida, M. Iwasaki, Z. P. Zhang, B. G. Cheon, A. Garmash, Y. Unno, V. Chekelian, A. Chen, K. Belous, R. Van Tonder, M. Mrvar, P. L. Wang, J. H. Yin, G. Pakhlova, C. Kiesling, A. Bobrov, K. Kumara, V. Savinov, H. Aihara, Y. Usov, Z. S. Stottler, Rocky Bala Garg, Sadaharu Uehara, C. Hadjivasiliou, Samo Korpar, H. Ye, Samo Stanič, U. Tamponi, M. Bessner, C. H. Wang, S. Paul, M. Niiyama, T. Bilka, M. Watanabe, T. E. Browder, D. Červenkov, K. Tanida, D. Matvienko, B.A. Shwartz, Y. Jin, R. Kroeger, P. Goldenzweig, S. Pardi, Bruce Yabsley, R. Pestotnik, D. Cinabro, Somnath Choudhury, J. Libby, D. M. Asner, K. Hayasaka, E. Kovalenko, M. T. Prim, Takeo Kawasaki, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Belle
Subjects: Nuclear and High Energy Physics, Particle physics, Upsilon(10570): electroproduction, Overline, final state: ((n)jet), B: hadronic decay, measured [channel cross section], Hadron, e+-e− Experiments, Quarkonium, BELLE, annihilation [electron positron], QC770-798, electron positron: annihilation, Particle and resonance production, 01 natural sciences, energy dependence, e+-e�� Experiments, KEK-B, KEKB, ((n)jet) [final state], Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, B meson, 010306 general physics, Spectroscopy, hadronic decay [B], Physics, B: pair production, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, e +-e − Experiments, electron positron: colliding beams, Belle experiment, pair production [B], Upsilon(10870): electroproduction, electroproduction [Upsilon(10870)], 10.63-11.02 GeV-cms, electroproduction [Upsilon(10570)], colliding beams [electron positron], High Energy Physics::Experiment, channel cross section: measured, Energy (signal processing), experimental results
Abstract: Journal of high energy physics 06(6), 137 (2021). doi:10.1007/JHEP06(2021)137, We report the first measurement of the exclusive cross sections e$^{+}$e$^{��}$ �� $ B\overline{B} $, e$^{+}$e$^{��}$ �� $ B{\overline{B}}^{\ast } $, and e$^{+}$e$^{��}$ �� $ {B}^{\ast }{\overline{B}}^{\ast } $ in the energy range from 10.63 GeV to 11.02 GeV. The B mesons are fully reconstructed in a large number of hadronic final states and the three channels are identified using a beam-constrained-mass variable. The shapes of the exclusive cross sections show oscillatory behavior with several maxima and minima. The results are obtained using data collected by the Belle experiment at the KEKB asymmetric-energy e$^{+}$e$^{��}$ collider.[graphic not available: see fulltext], Published by SISSA, [Trieste]
Published: 2021
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38. Precise Measurement of the D0 and D+ Lifetimes at Belle II

Author: R. Mussa, F. Pham, H. Svidras, T. Lam, A. Ishikawa, L. E. Piilonen, M. Nakao, P. Križan, K. Yoshihara, Concettina Sfienti, P. Oskin, U. Tamponi, M. Iwasaki, T. Iijima, A. Kuzmin, M. Welsch, T. M. G. Kraetzschmar, E.-J. Jang, B. G. Cheon, S. Ogawa, G. Giakoustidis, H. Ono, L. M. Cremaldi, K. Matsuoka, T. Kuhr, G. L. Pinna Angioni, S. E. Vahsen, I. Ueda, S. Pardi, N. Rad, M. Bračko, A. Gabrielli, Antonio Budano, Y. Iwasaki, Y. J. Kwon, J. F. Strube, S. Kohani, L. Lanceri, S. Uehara, Makoto Tabata, Jakub Kandra, N. Rout, P. Leitl, T. V. Dong, W. Gradl, K. Flood, C. Niebuhr, X. Y. Zhou, S. Sandilya, M. Starič, M. Hernandez Villanueva, Hidekazu Kakuno, S. Y. Suzuki, L. Corona, R. Stroili, M. Remnev, S. Baehr, E. Wang, F. Meier, I. Ripp-Baudot, Shih-Chang Lee, S. Pokharel, R. Itoh, S. Jia, Dipak Kumar Sahoo, D. Bodrov, P. Bambade, Luka Santelj, Bruce Yabsley, T. Matsuda, Enrico Bernieri, S. Uno, H. Junkerkalefeld, L. Aggarwal, Sunil Bansal, Y. Unno, C. Murphy, C. Wessel, M. Niiyama, Rok Pestotnik, D. Biswas, T. Tsuboyama, F. Abudinén, M. Piccolo, Takeo Higuchi, Carlos Marinas, J. M. Roney, J. Libby, D. M. Asner, S. Halder, K. Hayasaka, R. Tiwary, C. Miller, C. H. Kim, F. Di Capua, T. Koga, A. B. Kaliyar, A. Pathak, K. Tanida, G. Dujany, H. G. Moser, T. Bilka, Daniel Greenwald, F. Tenchini, S. Prell, Seema Bahinipati, Andrey Sokolov, T. Uglov, B. Paschen, G. De Pietro, B. Shwartz, Y. Uematsu, M. Takizawa, Yu. Onishchuk, A. Vinokurova, S. Dubey, I. Heredia-De La Cruz, K. Hara, Y. Seino, H. Tanigawa, B. Golob, M. Bertemes, C.-L. Hsu, M. Watanabe, H. Ozaki, T. E. Browder, A. Glazov, O. Hartbrich, J. Schueler, M. T. Prim, Takeo Kawasaki, D. Y. Kim, Dmytro Levit, A. Natochii, J. Baudot, C. H. Li, K. Lieret, K. Inami, V. Zhukova, Y. Onuki, A. Fodor, Kouji Nakamura, S. Bilokin, R. Žlebčík, A. Baur, P. Krokovny, Sw. Banerjee, John Yelton, S. Stefkova, Q. D. Zhou, D. Cinabro, R. Giordano, Shuji Tanaka, E. C. Hill, Hamad Ahmed, Q. Y. Liu, M. Dorigo, E. Kovalenko, K. Unger, P. Pakhlov, Rakesh Kumar, T. Podobnik, A. J. Schwartz, Z. Doležal, G. Inguglia, G. Nazaryan, P. Chang, M. Kumar, I. Domínguez Jiménez, V. Bhardwaj, Z. Liptak, E. Bertholet, I. Adachi, F. Forti, M. Mrvar, J. Serrano, H. Ye, M. Barrett, E. Won, K. H. Kang, K. Cho, N. Molina-Gonzalez, A. Passeri, L. Zani, G. Polat, R. Kowalewski, K. Trabelsi, J. Guilliams, G. Finocchiaro, J. Bennett, A. Sangal, G. Casarosa, C. Praz, T. Gu, M. Z. Wang, K. Kinoshita, Peter Kodys, W. W. Jacobs, M. Bessner, G. S. Varner, A. Gellrich, S. Raiz, Abner Soffer, Elisa Manoni, K. Chirapatpimol, S. Reiter, N. Gabyshev, D. Červenkov, Nils Braun, T. Czank, S. Cunliffe, P. L. M. Podesta-Lerma, B. Spruck, I. M. Peruzzi, R. de Sangro, D. Epifanov, M. Campajola, H. Purwar, A. Selce, E. Solovieva, T. Lueck, A. Bolz, Somnath Choudhury, T. Hara, H. Aihara, K. Lautenbach, A. Panta, M. Merola, J. G. Shiu, Y.-T. Chen, Samo Korpar, Claudia Cecchi, G. de Marino, A. Rostomyan, A. Paladino, M. C. Chang, S. Bussino, V.N. Zhilich, L. B. Rizzuto, Agnese Martini, F. Bianchi, Y. Ushiroda, N. Toutounji, Jürgen Becker, S. Yamada, R. Manfredi, Hitoshi Hirata, Y. Kato, D. Ferlewicz, H. Nakazawa, P. Branchini, S. Bettarini, Yu. V. Usov, W. Sutcliffe, J. H. Yin, B. G. Fulsom, Florian Urs Bernlochner, S. Nishida, G. Karyan, A. Di Canto, Jochen Dingfelder, K. Senyo, H. M. Wakeling, J. Wiechczynski, T. K. Pedlar, K. Uno, Andreas Warburton, C. Kiesling, W. B. Yan, D. A. Sanders, Phillip Urquijo, R. Godang, Ya-Qiu Jin, G. De Nardo, D. Tonelli, R. Mizuk, M. Sumihama, C. H. Chen, Z. Natkaniec, A. Vossen, S. K. Choi, L. K. Li, E. R. Oxford, K. Miyabayashi, S. Duell, R. Peschke, E. Paoloni, K. Nishimura, Frank Simon, Seongbae Yang, N. Taniguchi, C. Hearty, Y. Guan, Prafulla Kumar Behera, M. Destefanis, M. Hoek, Matthias Bauer, R. Cheaib, K. Kumara, S. Spataro, X. P. Xu, E. Prencipe, M. Rozanska, H. Hayashii, Z. S. Stottler, A. K. Giri, R. J. Sobie, D. Matvienko, L. Vitale, N. K. Nisar, H. K. Moon, J. Kumar, S.-H. Park, J. S. Lange, C. Hadjivasiliou, R. Karl, T. D. Kimmel, Stefano Longo, T. Pang, S. Patra, A. Sibidanov, K. Adamczyk, F. Dattola, L. Cao, A. Bobrov, D. Liventsev, F. R. Le Diberder, Yongsun Kim, B. Gobbo, K. Lalwani, P. Goldenzweig, N. Anh Ky, E. Graziani, E. De La Cruz-Burelo, H. E. Cho, C. Schwanda, F. Krinner, E. Torassa, Pere Rados, M. V. Purohit, R. A. Briere, I. Nakamura, K. Chilikin, D. E. Jaffe, T. Humair, P. Ecker, M. Hohmann, E. Waheed, V. Aushev, Tomoyuki Konno, D. Dossett, C. Lyu, S.-J. Cho, A. De Yta-Hernandez, J. A. McKenna, Y. Kim, V. Babu, T. Ferber, S. Kurz, V. Popov, S. Dey, A. Hershenhorn, G. Rizzo, S. Lacaprara, N. Akopov, Soumen Paul, Felix Metzner, B. Scavino, H. Atmacan, G. B. Mohanty, Alberto Aloisio, Y. Yusa, Yuki Sato, M. Laurenza, V. Savinov, S. Bacher, K. Dort, H. Park, A. Bozek, K. Gudkova, Alessandro Gaz, S. H. Robertson, X. L. Wang, V. Chekelian, S. Hazra, R. Van Tonder, and H. Bae
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, law, 0103 physical sciences, General Physics and Astronomy, Resonance, 010306 general physics, Collider, 01 natural sciences, law.invention, Luminosity
Abstract: We report a measurement of the D^{0} and D^{+} lifetimes using D^{0}→K^{-}π^{+} and D^{+}→K^{-}π^{+}π^{+} decays reconstructed in e^{+}e^{-}→cc[over ¯] data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy e^{+}e^{-} collider. The data, collected at center-of-mass energies at or near the ϒ(4S) resonance, correspond to an integrated luminosity of 72 fb^{-1}. The results, τ(D^{0})=410.5±1.1(stat)±0.8(syst) fs and τ(D^{+})=1030.4±4.7(stat)±3.1(syst) fs, are the most precise to date and are consistent with previous determinations.
Published: 2021

39. Search for B+→K+νν¯ Decays Using an Inclusive Tagging Method at Belle II

Author: T. Pang, S. Patra, A. Pathak, K. Adamczyk, G.V. Russo, J. Libby, D. M. Asner, T. Matsuda, Enrico Bernieri, K. Hayasaka, T. V. Dong, Tomoyuki Konno, E. Kovalenko, L. Zani, S. Fiore, F. R. Le Diberder, C. Lyu, A. Vinokurova, S. Dubey, I. Heredia-De La Cruz, P. Grace, J. Baudot, C. H. Li, I. M. Peruzzi, S.-J. Cho, Y. Seino, A. De Yta-Hernandez, O. Hartbrich, Y. Ushiroda, C. Niebuhr, X. Y. Zhou, B. Wach, H. Windel, E. Graziani, E. De La Cruz-Burelo, M. T. Prim, D. Liventsev, P. Krokovny, Rakesh Kumar, C. La Licata, B.A. Shwartz, Takeo Kawasaki, F. Bianchi, H. M. Wakeling, L. E. Piilonen, I. Domínguez Jiménez, Hitoshi Hirata, K. H. Kang, K. Cho, P. Oskin, Agnese Martini, S. Sandilya, A. Kuzmin, M. Welsch, R. Mizuk, E. Ganiev, P. Taras, D. Biswas, A. B. Kaliyar, T. Iijima, C. W. Joo, A. Sangal, T. M. G. Kraetzschmar, S. Stefkova, M. Starič, M. Z. Wang, Andrey Sokolov, Nils Braun, K. Matsuoka, T. Kuhr, Y.-T. Lai, S. Ogawa, D. Cinabro, R. Giordano, A. Baur, H. Ye, J. Schueler, M. E. Sevior, Claudia Cecchi, A. Panta, M. Merola, W. Gradl, P. L. M. Podesta-Lerma, Antonio Budano, K. Chilikin, N. Akopov, G. Inguglia, G. Nazaryan, T. Kunigo, C. Ketter, P. Goldenzweig, A. Gaz, A. Korobov, P. Chang, M. Kumar, M. De Nuccio, K. Nishimura, Frank Simon, R. M. Seddon, D. E. Jaffe, Abner Soffer, N. Anh Ky, H. Ozaki, V. Babu, K. Senyo, S. H. Robertson, S. Nishida, C. H. Chen, S. E. Vahsen, A. J. Schwartz, Kazuhiko Hara, A. Frey, D. Epifanov, Marco Milesi, M. Hernandez Villanueva, G. Finocchiaro, Dipak Kumar Sahoo, P. Bambade, K. Tanida, Y. M. Yook, J. Serrano, T. Ferber, S. Cunliffe, X. L. Wang, Yizeng Li, A. Di Canto, S. Bussino, Sunil Bansal, J. Bennett, Andreas Warburton, Y. Iwasaki, F. Abudinén, Y. J. Kwon, Somnath Choudhury, Tagir Aushev, S. Kurz, Semen Eidelman, S. Pardi, S. Spataro, T. Humair, K. Nakamura, V. Zhukova, Y. Onuki, Makoto Tabata, V. Chekelian, D. Rodríguez Pérez, G. De Nardo, S. Y. Suzuki, S. Hazra, T. K. Pedlar, N. Taniguchi, M. Takizawa, J. G. Shiu, R. Mussa, Jakub Kandra, M. Campajola, N. Rout, X. P. Xu, B. Paschen, Paul Jackson, Y.-T. Chen, Soumen Paul, M. Uchida, Felix Metzner, A. Gellrich, S. Raiz, H. Svidras, A. Garmash, C. Hadjivasiliou, Daniel Greenwald, John Yelton, L. K. Li, R. Van Tonder, M. Hohmann, A. Lozar, Z. Doležal, A. Natochii, A. Ishikawa, K. Inami, N. Toutounji, N. Rad, R. Pestotnik, E. Paoloni, M. Nakao, Stefano Longo, F. Tenchini, I. Ripp-Baudot, F. Meier, P. Križan, M. Remnev, H. Miyake, C.-L. Hsu, L. Cao, B. Scavino, D. A. Sanders, D. Matvienko, J. Wiechczynski, Seongbae Yang, H. Tanigawa, T. Podobnik, B. Spruck, K. Dort, B. Golob, Melissa K. Takahashi, S. Prell, S. Bettarini, Bruce Yabsley, Shih-Chang Lee, S. Duell, C. Miller, C. Hearty, E. Prencipe, Q. Y. Liu, P. Ahlburg, Martin Ritter, Dmytro Levit, M. Maggiora, Phillip Urquijo, N. K. Nisar, K. Lieret, K. Trabelsi, C. H. Kim, Z. Liptak, E. C. Hill, H. Park, S. X. Li, A. Bozek, W. A. T. Wan Abdullah, H. G. Moser, H. Atmacan, D. J. Summers, J. S. Lange, K. Uno, T. Koga, A. Selce, A. Passeri, M. Piccolo, Peter Kodys, R. Karl, T. D. Kimmel, E. Waheed, V.N. Zhilich, V. Aushev, Carlos Marinas, W. W. Jacobs, M. Bertemes, D. Ferlewicz, H. Hayashii, W. Sutcliffe, Elisa Manoni, R. J. Sobie, John Webb, L. Vitale, K. Chirapatpimol, M. Eliachevitch, J. Kumar, S.-H. Park, Yuki Sato, V. Popov, C. Z. Yuan, L. Santelj, S. Dey, K. Miyabayashi, Y. Guan, A. Paladino, R. Manfredi, E. Solovieva, T. Lueck, A. Sibidanov, A. Glazov, M. Laurenza, L. B. Rizzuto, G. de Marino, G. S. Varner, A. Hershenhorn, J. H. Yin, R. Cheaib, P. Branchini, G. Karyan, K. Kumara, Florian Urs Bernlochner, K. Gudkova, S. Lacaprara, V. Savinov, C. Kiesling, R. de Sangro, Z. S. Stottler, G. B. Mohanty, Alberto Aloisio, F. Krinner, A. K. Giri, Y. Yusa, S. Marcello, S. Baehr, G. Rizzo, M. Bračko, M. Destefanis, R. Itoh, K. Yoshihara, Concettina Sfienti, M. Masuda, G. Dujany, M. Iwasaki, F. Dattola, Sw. Banerjee, Satoshi Tanaka, E. Torassa, B. G. Cheon, L. M. Cremaldi, C. Murphy, C. Wessel, N. Gabyshev, D. Červenkov, A. Rostomyan, S. Korpar, F. Forti, M. Mrvar, B. G. Fulsom, R. Godang, S. Watanuki, Prafulla Kumar Behera, K. Sumisawa, S. Kohani, L. Corona, J. Irakkathil Jabbar, M. Garcia-Hernandez, G. Pakhlova, A. Fodor, H. Kichimi, Kevin Varvell, E. Bertholet, Takeo Higuchi, H. Aihara, F. Müller, Y. Usov, K. Lautenbach, Pere Rados, G. De Pietro, J. M. Roney, V. Gaur, M. Sumihama, C. Praz, M. Nayak, Ya-Qiu Jin, D. Tonelli, M. Hoek, Yongsun Kim, B. Gobbo, S. Uno, C. Schwanda, H. Ono, P. Leitl, R. Stroili, Y. Unno, D. Y. Kim, Q. D. Zhou, Iki Adachi, G. Polat, T. Fillinger, S. Pokharel, F. Di Capua, Y. Onishchuk, P. Pakhlov, P. Lewis, G. Casarosa, T. Czank, Jürgen Becker, S. Yamada, Jochen Dingfelder, W. B. Yan, Z. Natkaniec, U. Tamponi, M. Bessner, Surajit Maity, L. Lanceri, H. Junkerkalefeld, S. Halder, T. Bilka, and T. E. Browder
Subjects: Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, General Physics and Astronomy, Resonance, 01 natural sciences, law.invention, Pair production, law, 0103 physical sciences, High Energy Physics::Experiment, B meson, 010306 general physics, Collider, Energy (signal processing)
Abstract: A search for the flavor-changing neutral-current decay B^{+}→K^{+}νν[over ¯] is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collider. The data sample corresponds to an integrated luminosity of 63 fb^{-1} collected at the ϒ(4S) resonance and a sample of 9 fb^{-1} collected at an energy 60 MeV below the resonance. Because the measurable decay signature involves only a single charged kaon, a novel measurement approach is used that exploits not only the properties of the B^{+}→K^{+}νν[over ¯] decay, but also the inclusive properties of the other B meson in the ϒ(4S)→BB[over ¯] event, to suppress the background from other B meson decays and light-quark pair production. This inclusive tagging approach offers a higher signal efficiency compared to previous searches. No significant signal is observed. An upper limit on the branching fraction of B^{+}→K^{+}νν[over ¯] of 4.1×10^{-5} is set at the 90% confidence level.
Published: 2021

40. Measurement of the branching fraction of Λc+→pω decay at Belle

Author: T. Matsuda, A. Vinokurova, P. Pakhlov, D. Y. Kim, P. Krokovny, K. H. Kang, K. Cho, H. Park, A. Bozek, C.-L. Hsu, K. T. Kim, D. Epifanov, P. Goldenzweig, C. Sharma, J. Libby, Peter Kodys, W. W. Jacobs, M. Uchida, S. X. Li, K. K. Joo, L. K. Li, R. Mizuk, S. Sandilya, R. Dhamija, D. Liventsev, S. K. Choi, K. Tanida, Y. Yusa, E. Kovalenko, P. K. Behera, Y. Seino, S.-J. Cho, V.N. Zhilich, Y. Kato, V. Bhardwaj, T. K. Pedlar, G. De Pietro, P. Branchini, G. S. Varner, K.-H. Kim, Y.-T. Lai, Z. P. Zhang, Andrey Sokolov, M. T. Prim, M. Niiyama, J. H. Yin, M. Starič, C. Hadjivasiliou, M. Merola, C. P. Shen, K. Miyabayashi, T. Gu, M. Nayak, A. K. Giri, R. Itoh, H. Kichimi, F. Tenchini, Victoria Zhukova, A. Chen, S. Nishida, T. V. Dong, Y. Choi, M. Masuda, L. Nayak, T. Aushev, L. Santelj, A. Rostomyan, P. Wang, T. Podobnik, M. Takizawa, T. Sumiyoshi, H. Hayashii, Ya-Qiu Jin, J. G. Shiu, S. Al Said, S. E. Vahsen, T. Ferber, O. Hartbrich, T. Uglov, K. Gudkova, C. H. Kim, B. Golob, G. Schnell, Phillip Urquijo, T. Sanuki, T. Iijima, John Yelton, Z. Doležal, S. Das, M. Z. Wang, K. Kinoshita, N. K. Nisar, J. Li, A. Korobov, K. Kumara, N. Gabyshev, D. Červenkov, J. V. Bennett, H. Aihara, J. S. Lange, K. Uno, Y. Usov, S. Cunliffe, Jyoti Prakash Biswal, T. Pang, Y. B. Li, Yongsun Kim, T. Konno, Y. Guan, Y. Iwasaki, M. C. Chang, S. Uno, Y. J. Kwon, C. Schwanda, Seongbae Yang, G.V. Russo, K. Senyo, Z. S. Stottler, M. Shapkin, Antonio Budano, V. Gaur, Shih-Chang Lee, W. S. Hou, L. E. Piilonen, M. Nakao, B. G. Cheon, M. Röhrken, K. Chilikin, J. F. Strube, G. Pakhlova, P. Oskin, R. Mussa, S. Ogawa, N. Rout, R. Van Tonder, C. MacQueen, A. Ishikawa, Frank Simon, D. Bodrov, E. Wang, Vladimir Popov, Rahul Kumar, E. Waheed, R. B. Garg, B. Bhuyan, K. Hayasaka, A. Bobrov, K. Belous, S. Korpar, R. Kroeger, M. E. Sevior, Sudhanwa Patra, B. G. Fulsom, E. Graziani, T. E. Browder, P. Križan, Seokhee Park, H. E. Cho, R. Pestotnik, M. Campajola, A. B. Kaliyar, K. Lieret, M. Sumihama, M. Laurenza, Motoki Iwasaki, E. Won, Doyen Sahoo, W. Sutcliffe, V. Savinov, J. Borah, E. Solovieva, G. De Nardo, A. Natochii, K. Inami, M. Bračko, E. Prencipe, Bruce Yabsley, D. Cinabro, P. Chang, Somnath Choudhury, I. Adachi, F. Di Capua, W. B. Yan, H. Ono, Y. Unno, L. Li Gioi, H. Ye, S. Halder, Martin Florian Bessner, T. Bilka, U. Tamponi, S. Jia, C. H. Wang, S. Paul, and D. M. Asner
Subjects: Nuclear physics, Physics, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published: 2021

41. Measurements of the Branching Fractions of the Semileptonic Decays Ξc0→Ξ−ℓ+νℓ and the Asymmetry Parameter of Ξc0→Ξ−π+

Author: S. Jia, U. Tamponi, Dipak Kumar Sahoo, S. Pardi, A. Garmash, M. Bessner, G. Bonvicini, A. Natochii, N. K. Nisar, A. Vinokurova, M. Iwasaki, O. Hartbrich, B. Bhuyan, J. S. Lange, K. Uno, Andrey Sokolov, P. Krokovny, O. Grzymkowska, C. H. Wang, K.-H. Kim, L. E. Piilonen, Rakesh Kumar, J. Bennett, Jyoti Prakash Biswal, B. G. Cheon, D. Liventsev, K. H. Kang, K. Cho, S. Paul, S. Al Said, D. Cinabro, M. Z. Wang, K. Kinoshita, Yizeng Li, Semen Eidelman, Y. Jin, R. Kroeger, I. S. Lee, V. Savinov, M. Uchida, R. Mussa, T. Pang, A. Ishikawa, S. Patra, M. Kumar, P. Križan, P. Goldenzweig, H. Ye, R. Mizuk, S. Nishida, H. Ono, V. Bhardwaj, K. Adamczyk, S. Korpar, D. Epifanov, G.V. Russo, S. Das, Y. Iwasaki, A. Kuzmin, L. Nayak, V. Babu, G. Schnell, Y. J. Kwon, X. P. Xu, X. L. Wang, Prafulla Kumar Behera, S. Ogawa, G. S. Varner, J. T. McNeil, L. Li Gioi, A. Korobov, C. W. Joo, E. Prencipe, Somnath Choudhury, R. Van Tonder, N. Rout, M. Sumihama, P. L. Wang, T. Ferber, T. K. Pedlar, T. Kuhr, S. Cunliffe, H. Hayashii, R. Ayad, K. Kumara, M. Niiyama, R. Itoh, R. Dhamija, A. Rostomyan, J. G. Shiu, J. Libby, D. M. Asner, L. K. Li, M. C. Chang, K. Hayasaka, A. K. Giri, T. Mori, H. Aihara, B. G. Fulsom, K. Tanida, D. Y. Kim, Y. Usov, Seongbae Yang, T. Bilka, Tagir Aushev, Z. S. Stottler, E. Kovalenko, V. Zhukova, Y. Onuki, K. Lalwani, C. H. Li, S. Uno, A. Vossen, M. Masuda, Iki Adachi, M. Watanabe, T. E. Browder, H. Park, A. Bozek, Tomoyuki Konno, K. Nishimura, Y. Seino, C. Schwanda, M. Hernandez Villanueva, M. Campajola, E. Won, S. Watanuki, T. Uglov, M. T. Prim, Z. P. Zhang, T. V. Dong, Y. Sakai, V.N. Zhilich, Y. Kato, S. Sandilya, K. Lieret, F. Tenchini, V. Gaur, S.-J. Cho, T. Podobnik, G. Pakhlova, C.-L. Hsu, M. Starič, N. Dash, E. Solovieva, C. Sharma, M. Nayak, K. Senyo, Peter Kodys, W. W. Jacobs, T. Sanuki, C. P. Shen, Seok Kim, Shih-Chang Lee, D. Matvienko, F. Di Capua, C. H. Kim, G. Karyan, H. Kichimi, P. Pakhlov, N. Gabyshev, D. Červenkov, Rocky Bala Garg, W. B. Yan, Sadaharu Uehara, C. Hadjivasiliou, J. H. Yin, M. Bračko, A. Chen, G. De Nardo, G. B. Mohanty, M. Shapkin, M. Röhrken, K. Chilikin, C. Z. Yuan, Y. Choi, V. Popov, L. Santelj, R. Pestotnik, S. K. Choi, K. Gudkova, Felix Metzner, K. K. Joo, and T. J. Moon
Subjects: Physics, 010308 nuclear & particles physics, Branching fraction, media_common.quotation_subject, Zero (complex analysis), General Physics and Astronomy, Branching (polymer chemistry), 01 natural sciences, Asymmetry, Crystallography, KEKB, 0103 physical sciences, 010306 general physics, media_common, Lepton
Abstract: Using data samples of 89.5 and 711fb$^{-1}$ recorded at energies of $\sqrt{s}$=10.52 and 10.58 GeV, respectively, with the Belle detector at the KEKB e$^{+}$e$^{-}$ collider, we report measurements of branching fractions of semileptonic decays Ξ$_{c}$$^{0}$ → Ξ$^{-}$l$^{+}$ν$_{l}$(l=e or μ) and the CP-asymmetry parameter of Ξ$_{c}$$^{0}$ → Ξ$^{-}$π$^{+}$ decay. The branching fractions are measured to be B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$e$^{+}$ν$_{e}$)= 1.31±0.04±0.07±0.38)% and B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$μ$^{+}$ν$_{μ}$ = (1.27±0.06±0.10±0.37)% , and the decay parameter α$_{Ξπ}$ is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$e$^{+}$ν$_{e}$) /B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$μ$^{+}$ν$_{μ}$) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter A$_{CP}$=(α$_{Ξ^{-}π^{+}}$+α$_{Ξ^{+}π^{-}}$)/(α$_{Ξ^{-}π^{+}}$+α$_{Ξ^{+}π^{-}}$) = 0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξ$_{c}$$^{0}$ → Ξ$^{-}$π$^{+}$ branching fraction.
Published: 2021

42. Evidence for the decay Ωc0→π+Ω(2012)−→π+(K¯Ξ)−

Author: G. Schnell, F. Tenchini, S. Das, T. Kuhr, Y. Sakai, T. Podobnik, T. Sumiyoshi, S.-J. Cho, Antonio Budano, L. Li Gioi, K. Senyo, K. Lieret, J. Libby, K. Trabelsi, Y. Yusa, K. Kumara, P. Pakhlov, Shih-Chang Lee, C. Hadjivasiliou, G. De Pietro, F. Di Capua, E. Kovalenko, T. Sanuki, Z. S. Stottler, L. E. Piilonen, G. Pakhlova, T. Gu, P. Oskin, H. Ye, J. T. McNeil, Andrey Sokolov, A. Bozek, Y. Seino, E. Solovieva, D. Epifanov, C. H. Li, R. Ayad, M. Nayak, M. T. Prim, B. G. Cheon, K. Nishimura, M. Z. Wang, K. Kinoshita, D. Červenkov, Ya-Qiu Jin, Seema Bahinipati, T. V. Dong, Y. Choi, Shoichi Watanuki, Victoria Zhukova, R. Kroeger, L. Santelj, S. Nishida, T. K. Pedlar, D. Cinabro, A. Chen, H. Ono, S. Cunliffe, V. Chekelian, T. Mori, H. Aihara, Y. Usov, P. Chang, K. Tanida, C. Z. Yuan, K. Hayasaka, E. Prencipe, D. Matvienko, W. Sutcliffe, Jyoti Prakash Biswal, Y. Onuki, R. Van Tonder, V.E. Shebalin, A. Sangal, M. C. Chang, S. Al Said, S. Korpar, W. B. Yan, T. Matsuda, R. Mussa, R. B. Garg, B. G. Fulsom, Y. Unno, Somnath Choudhury, M. Takizawa, I. Adachi, S. Pardi, H. E. Cho, T. E. Browder, Z. Natkaniec, A. Ishikawa, Seokhee Park, S. Halder, N. Dash, M. Laurenza, John Yelton, E. Won, Z. Doležal, Seongbae Yang, Yongsun Kim, A. Vinokurova, T. Uglov, T. Bilka, M. Merola, K. Lalwani, V. M. Aulchenko, V. Gaur, G. De Nardo, S. Uno, C. Schwanda, V. Savinov, Bruce Yabsley, P. Križan, P. Krokovny, K. K. Joo, Vladimir Popov, M. Nakao, K. H. Kang, K. Cho, Doyen Sahoo, J. G. Shiu, A. Natochii, K. Inami, C. Kiesling, P. K. Behera, M. Bračko, E.-J. Jang, D. Y. Kim, T. Konno, E. Waheed, M. Sumihama, Martin Florian Bessner, Motoki Iwasaki, D. M. Asner, A. Passeri, K.-H. Kim, A. Korobov, M. Shapkin, O. Werbycka, H. Atmacan, K. Chilikin, Mukesh Kumar, Y. B. Li, H. Hayashii, M. Niiyama, E. Wang, C. H. Kim, Z. P. Zhang, R. Pestotnik, J. H. Yin, M. Uchida, L. K. Li, D. Liventsev, G. S. Varner, S. S. Tang, P. Wang, K. Gudkova, B. Golob, N. K. Nisar, C. P. Shen, Seok Kim, K. Uno, L. Nayak, V. Babu, T. Aushev, T. Ferber, G.V. Russo, V.N. Zhilich, K. Miyabayashi, W. S. Hou, Alexei Kuzmin, R. Mizuk, E. Graziani, M. Campajola, C. Sharma, Peter Kodys, W. W. Jacobs, S. E. Vahsen, P. Branchini, G. Karyan, Y. Iwasaki, Y. J. Kwon, A. K. Giri, N. Rout, M. Masuda, G. B. Mohanty, P. Goldenzweig, S. Sandilya, M. Starič, S. Jia, C. H. Wang, and S. Paul
Subjects: Physics, KEKB, 010308 nuclear & particles physics, Branching fraction, Isospin, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Abstract: Using a data sample of 980 fb$^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy e$^{+}$e$^{-}$ collider, we present evidence for the Ω(2012)$^{-}$ in the resonant substructure of Ω$_{c}$$^{0}$ → π$^{+}$ ($\overline{K}$ Ξ)$^{-}$ (($\overline{K}$ Ξ)$^{-}$ = K$^{-}$Ξ$^{0}$ + K$^{0}$Ξ$^{-}$ ecays. The significance of the decays. The significance of the Ω(2012)$^{-}$ signal is 4.2σ after considering the systematic uncertainties. The ratio of the branching fraction of Ω$_{c}$$^{0}$ → π$^{+}$ Ω(2012)$^{-}$ π$^{+}$ ($\overline{K}$ Ξ)$^{-}$ relative to that of Ω$_{c}$$^{0}$ → π$^{+}$ Ω$^{-}$ is calculated to be 0.220±0.059(stat.)±0.035(syst.). The individual ratios of the branching fractions of the two isospin modes are also determined and found to be B (Ω$_{c}$$^{0}$ → π$^{+}$ Ω(2012)$^{-}$) x B(Ω(2012)$^{-}$ → $\overline{K}$ Ξ$^{0}$) / B(Ω$_{c}$$^{0}$ → π$^{+}$ K$^{-}$Ξ$^{0}$ = (9.6±3.2(stat.) ±1.8(syst.))% and B (Ω$_{c}$$^{0}$ → π$^{+}$ Ω(2012)$^{-}$) x B(Ω(2012)$^{-}$ → $\overline{K}$$^{0}$ Ξ$^{-}$) / B(Ω$_{c}$$^{0}$ → π$^{+}$ $\overline{K}$$^{0}$Ξ$^{-}$) =(5.5±2.8(stat.) ±0.7(syst.))%
Published: 2021

43. Measurement of the masses and widths of the Σc(2455)+ and Σc(2520)+ baryons

Author: S-H Park, B. G. Cheon, Seema Bahinipati, T. V. Dong, M. Takizawa, Y. Choi, S. Das, T. Hara, J. V. Bennett, Y. Tao, S. Al Said, L. Santelj, H. Aihara, S. E. Vahsen, M. Uchida, L. K. Li, D. Liventsev, G. S. Varner, Y. Usov, R. Itoh, A. Rostomyan, P. Wang, Zhukova, K. Gudkova, K. Belous, L. Nayak, John Yelton, S. Korpar, D. Matvienko, Gaur, O. Hartbrich, Y. Iwasaki, U. Tamponi, N. Dash, T. Aushev, K. Senyo, S. Pardi, R. B. Garg, A. Chen, B. Bhuyan, G. De Nardo, A. Korobov, M. Sumihama, M. Niiyama, N. Rout, Motoki Iwasaki, T. Ferber, Chekelian, B. G. Fulsom, J-G Shiu, G. Schnell, S. Jia, S. Uno, C. Schwanda, T. E. Browder, Z. P. Zhang, R. Mizuk, S. Cunliffe, M. Shapkin, Andrey Sokolov, G. De Pietro, M. Laurenza, K. Chilikin, P. Goldenzweig, T. Matsuda, A. Sangal, T. Kuhr, S. Sandilya, Shih-Chang Lee, I. Adachi, M. C. Chang, Jyoti Prakash Biswal, Babu, M. Merola, Antonio Budano, Phillip Urquijo, T. Gu, Y-J Kwon, R. Kroeger, M. E. Sevior, P. Krizan, K. Kumara, M. Nakao, R. Pestotnik, M. Nayak, Ya-Qiu Jin, M. Starič, Y. B. Li, R. Dhamija, Seongbae Yang, D Wang, C.-L. Hsu, A. Vinokurova, C. Hadjivasiliou, C. H. Wang, Z. S. Stottler, L. E. Piilonen, Bruce Yabsley, K. Tanida, T. Uglov, P. Pakhlov, E. Wang, Y. Onuki, G. Pakhlova, P. Oskin, R. Kulasiri, W-S Hou, S. Paul, L. Li Gioi, C. Z. Yuan, E. Prencipe, P. Krokovny, C. Sharma, Peter Kodys, S-J Cho, J. Li, W. W. Jacobs, K. Trabelsi, H. Ye, Y. Sakai, K. H. Kang, K. Cho, S. K. Choi, T. J. Moon, K. T. Kim, D. Cinabro, C. P. Shen, Zdenek Dolezal, Seok Kim, H. Park, T. Konno, A. Bozek, K. Lieret, Martin Florian Bessner, R. Ayad, N. Gabyshev, D. Červenkov, D. Epifanov, A. Garmash, P. Branchini, D. Y. Kim, K. Sumisawa, S. Nishida, D. M. Asner, T. K. Pedlar, Zhilich, P. K. Behera, F. Tenchini, A. K. Giri, E. Solovieva, P. Chang, T. Podobnik, T. Sumiyoshi, Yk Kim, K. Hayasaka, R. Mussa, T. Sanuki, M. Masuda, R. Van Tonder, G. B. Mohanty, A. Ishikawa, H. E. Cho, Doyen Sahoo, S. Ogawa, Somnath Choudhury, W. B. Yan, E. Waheed, Z. Natkaniec, J. Libby, E. Kovalenko, Y. Seino, M. T. Prim, Shoichi Watanuki, T. Bilka, M. Watanabe, J. C. Dingfelder, F. Di Capua, K. K. Joo, A. B. Kaliyar, J. Schueler, E. Won, C. MacQueen, J. K. Ahn, H. Atmacan, G.V. Russo, E. Graziani, J. H. Yin, M. Campajola, Y. Kato, D. Ferlewicz, N. K. Nisar, Bhardwaj, J. S. Lange, K. Miyabayashi, C. Kiesling, M. Bračko, H. Ono, Y. Unno, H. Hayashii, C. H. Kim, M. Z. Wang, K. Kinoshita, Aulchenko, A. Natochii, K. Inami, Savinov, and J. T. McNeil
Subjects: Physics, Quark, Particle physics, 010308 nuclear & particles physics, Sigma, Lambda, 01 natural sciences, law.invention, Baryon, Charmed baryons, KEKB, law, 0103 physical sciences, 010306 general physics, Collider
Abstract: Using 980 ${\rm fb}^{-1}$ of data {collected} with the Belle detector operating at the KEKB asymmetric-energy $e^+e^-$ collider, we report the measurements of the masses, and the first measurements of the instrinsic widths, of the $\Sigma_c(2455)^+$ and $\Sigma_c(2520)^+$ charmed baryons. We find $M(\Sigma_c(2455)^+)-M(\Lambda_c^+) = 166.17\pm 0.05^{+0.16}_{-0.07}\ {\rm MeV}/c^2$, $\Gamma(\Sigma_c(2455)^+) = 2.3 \pm 0.3 \pm 0.3\ {\rm MeV/c^2}$, $M(\Sigma_c(2520)^+)-M(\Lambda_c^+) = 230.9 \pm 0.5 ^{+0.5}_{-0.1}\ {\rm MeV}/c^2$, and $\Gamma(\Sigma_c(2520)^+) = 17.2^{+2.3\ +3.1}_{-2.1\ -0.7}\ {\rm MeV}/c^2$, where the uncertainties are statistical and systematic, respectively. These measurements can be used to test models of the underlying quark structure of the $\Sigma_c$ states.
Published: 2021

44. Measurements of the branching fractions ofΛc+→pηandΛc+→pπ0decays at Belle

Author: Jyoti Prakash Biswal, S. Eidelman, P. Pakhlov, P. Goldenzweig, S. Cunliffe, S. Sandilya, M. Sumihama, Martin Florian Bessner, Motoki Iwasaki, M. C. Chang, M. Nakao, H. Park, A. Bozek, D. Epifanov, Soumya D. Mohanty, S-H Park, A. Ishikawa, B. H. Kim, Doyen Sahoo, E. Wang, T. Pang, M. Takizawa, D. Y. Kim, C. Z. Yuan, R. Mizuk, D. M. Asner, F. Di Capua, T. K. Pedlar, Y. Sakai, A. Chen, I. Adachi, K. Hayasaka, A. Bobrov, H. E. Cho, R. B. Garg, B. Bhuyan, B. G. Fulsom, J-G Shiu, G.V. Russo, K. Lieret, T. E. Browder, Y-J Kwon, Florian Urs Bernlochner, Z. P. Zhang, J. K. Ahn, A. Korobov, L. Nayak, W-S Hou, E. Prencipe, Zhulanov, R. Dhamija, L. E. Piilonen, G. Pakhlova, Shebalin, Alexei Kuzmin, T. Aushev, John Yelton, C.-L. Hsu, R. Kroeger, M. E. Sevior, I. S. Lee, R. Ayad, P. Krizan, M. Uchida, L. K. Li, Phillip Urquijo, Y. Yusa, C. Sharma, Peter Kodys, W. W. Jacobs, M. Campajola, S. Uehara, Shih-Chang Lee, T. Ferber, G. Schnell, T. Iijima, T. Uglov, C. W. Joo, K. Tanida, Y. Kato, D. Ferlewicz, Zhilich, D. Liventsev, E. Solovieva, S. Nishida, Zdenek Dolezal, G. De Nardo, M. Niiyama, Y. Iwasaki, H. Ono, T. Matsuda, Y. B. Li, A. B. Kaliyar, M. T. Hedges, S. Das, G. Karyan, T. Konno, K. Lalwani, T. Kuhr, G. S. Varner, B. Shwartz, Seongbae Yang, J. V. Bennett, Y. Tao, S. Uno, C. Schwanda, H. Kichimi, T. Mori, H. Aihara, A. Vossen, J. Schueler, R. Van Tonder, N. Rout, A. K. Giri, Yk Kim, F. Tenchini, T. Podobnik, T. Sumiyoshi, M. Shapkin, K. Kumara, A. Natochii, M. Masuda, K. Inami, Savinov, E. Won, R. Itoh, B. G. Cheon, E.-J. Jang, M. Röhrken, K. Chilikin, W. Sutcliffe, Y. Onuki, Z. S. Stottler, A. Garmash, A. Rostomyan, P. Wang, Zhukova, Seema Bahinipati, T. V. Dong, T. Sanuki, T. Bilka, SX Li, P. Krokovny, L. Cao, Y. Choi, M. Z. Wang, K. Kinoshita, K. Gudkova, X. P. Xu, K. H. Kang, K. Cho, Popov, L. Santelj, Sudhanwa Patra, K. Trabelsi, C. H. Li, Ya-Qiu Jin, S. Korpar, R. Pestotnik, C. P. Shen, Seok Kim, N. Dash, A. Sangal, P. K. Behera, D. Matvienko, Mukesh Kumar, H. Hayashii, Gaur, O. Hartbrich, Babu, M. Merola, K. Senyo, J. H. Yin, C. H. Kim, T. Kawasaki, S. Jia, K. T. Kim, W. B. Yan, C. Hadjivasiliou, Z. Natkaniec, B. Golob, O. Grzymkowska, C. H. Wang, S. Paul, L. Li Gioi, Felix Metzner, N. K. Nisar, H. Ye, Bhardwaj, J. S. Lange, K. Uno, K. K. Joo, S. Pardi, Bruce Yabsley, D. Cinabro, G. Inguglia, Somnath Choudhury, J. Libby, E. Kovalenko, Y. Seino, M. T. Prim, and Shoichi Watanuki
Subjects: Quark, Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, Branching (polymer chemistry), 01 natural sciences, law.invention, KEKB, law, 0103 physical sciences, Invariant mass, 010306 general physics, Collider
Abstract: We report measurements of the branching fractions of singly Cabibbo-suppressed decays Λc+→pη and Λc+→pπ0 using the full Belle data sample corresponding to an integrated luminosity of 980.6 fb-1. The data were collected by the Belle detector at the KEKB e+e- asymmetric energy collider. A clear Λc+ signal is seen in the invariant mass distribution of pη. The fitted number of signal events of the Λc+→pη process is 7734±263; from this, we measure the ratio of branching fractions B(Λc+→pη)/B(Λc+→pK-π+)=[2.258±0.077(stat)±0.122(syst)]×10-2, from which we infer the branching fraction B(Λc+→pη)=[1.42±0.05(stat)±0.11(syst)]×10-3. In addition, no significant signal for Λc+→pπ0 is found, so an upper limit on the branching fraction of B(Λc+→pπ0)
Published: 2021

45. Measurement of branching fraction and search for CP violation in B→ϕϕK

Author: G. Schnell, S. Das, K. Tanida, W. B. Yan, Jyoti Prakash Biswal, Z. J. Liptak, J. Wiechczynski, K. Hayasaka, A. Bobrov, M. Uchida, P. Goldenzweig, V. Gaur, A. B. Kaliyar, S. Cunliffe, S. Sandilya, L. K. Li, Y. Guan, M. Nakao, J. Schueler, Motoki Iwasaki, C. W. Park, E. Won, J. G. Shiu, D. Liventsev, E. Wang, M. Starič, M. Takizawa, L. E. Piilonen, M. E. Sevior, G. Pakhlova, P. Oskin, F. Di Capua, G. S. Varner, R. Kulasiri, C.-L. Hsu, M. Bračko, H. Atmacan, A. Sangal, S. Mohanty, R. Itoh, S. Jia, S.-J. Cho, M. Merola, A. Rostomyan, Victoria Zhukova, P. Wang, T. Matsuda, Z. Doležal, Y. Onuki, Z. P. Zhang, C. Sharma, Peter Kodys, W. W. Jacobs, K. Gudkova, J. H. Yin, O. Grzymkowska, C. H. Wang, A. Chen, J. Libby, G. De Nardo, L. Li Gioi, J. F. Strube, Kohei Ogawa, Seok Kim, V. M. Aulchenko, A. Vinokurova, Y. B. Li, L. Nayak, V. Babu, T. Aushev, Rahul Kumar, G. Karyan, Frank Simon, H. Ye, A. Natochii, B. Golob, I. Adachi, F. Tenchini, K. Inami, P. Krokovny, Vladimir Popov, Kevin Varvell, N. K. Nisar, T. Podobnik, Shih-Chang Lee, T. Ferber, T. Sumiyoshi, S. Al Said, K. H. Kang, K. Cho, Y. Seino, J. Li, M. T. Prim, T. J. Moon, Sudhanwa Patra, A. K. Giri, Shoichi Watanuki, D. Cinabro, T. Konno, Y. Tao, H. Aihara, Y. Usov, T. Sanuki, K. Senyo, B. Shwartz, Y. Sakai, S. Halder, T. Bilka, M. Masuda, G. B. Mohanty, B. H. Kim, Yongsun Kim, M. Shapkin, K. Lalwani, S. Uno, C. Schwanda, M. Röhrken, Mukesh Kumar, S. K. Choi, K. Chilikin, Somnath Choudhury, E. Prencipe, H. Hayashii, S. Pardi, C. H. Kim, S. Ogawa, N. Gabyshev, D. Červenkov, E. Solovieva, Y. Unno, M. Z. Wang, K. Kinoshita, M. Nayak, X. P. Xu, Martin Florian Bessner, R. Pestotnik, D. Kotchetkov, Bruce Yabsley, R. Mizuk, Ya-Qiu Jin, D. M. Asner, R. Dhamija, C. MacQueen, A. J. Schwartz, M. Campajola, V.N. Zhilich, K. Miyabayashi, Tariq Aziz, S. Eidelman, Seema Bahinipati, T. V. Dong, Y. Choi, V. Bhardwaj, T. K. Pedlar, R. Mussa, H. B. Jeon, B. G. Cheon, A. Ishikawa, H. Park, A. Bozek, S. Korpar, N. Dash, P. Križan, S. Nishida, Doyen Sahoo, K. Kumara, X. L. Wang, V. Chekelian, Z. S. Stottler, K. K. Joo, R. Van Tonder, Seokhee Park, B. G. Fulsom, T. E. Browder, D. Y. Kim, V. Savinov, C. Hadjivasiliou, S. E. Vahsen, Y. J. Kwon, N. Rout, A. Garmash, K. Adamczyk, G.V. Russo, W. S. Hou, V. Vorobyev, and P. K. Behera
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, media_common.quotation_subject, Resonance, 01 natural sciences, Asymmetry, law.invention, KEKB, law, 0103 physical sciences, CP violation, 010306 general physics, Collider, media_common
Abstract: We report the measurement of branching fractions and CP-violation asymmetries in B→φφK decays based on a 711 fb-1 data sample containing 772×106 BB¯ events. The data were recorded at the I(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. For B+→φφK+, the branching fraction and CP-violation asymmetry measured below the ηc threshold (mφφ
Published: 2021

46. Measurement of time-dependent CP violation parameters in B0→KS0KS0KS0 decays at Belle

Author: R. Mizuk, C. Beleño, A. B. Kaliyar, L. Li Gioi, H. Miyata, Yongsun Kim, J. Li, J. Schueler, S. Uno, C. Schwanda, H. Ye, T. J. Moon, E. Won, A. K. Giri, K. Trabelsi, M. Masuda, G. B. Mohanty, K. Hayasaka, S. Pardi, L. Cao, M. Z. Wang, K. Kinoshita, S. Cunliffe, Seok Kim, Y. Guan, M. Shapkin, M. C. Chang, C.-L. Hsu, M. Takizawa, Y. Yusa, Z. P. Zhang, Peter Kodys, W. W. Jacobs, M. Röhrken, V. Babu, P. Goldenzweig, H. Ono, K. Chilikin, A. Garmash, Daniel Greenwald, G. Karyan, A. Sangal, G.V. Russo, T. Aushev, G. Schnell, C. MacQueen, H. Nakazawa, A. M. Bakich, J. E. Fast, B. G. Cheon, J. K. Ahn, S. Sandilya, L. E. Piilonen, G. Pakhlova, P. Oskin, R. Kulasiri, W. S. Hou, T. Ferber, M. Nayak, D. Matvienko, R. B. Garg, A. J. Schwartz, Z. Doležal, K. Sumisawa, M. Merola, Motoki Iwasaki, D. M. Asner, Alexei Kuzmin, D. Y. Kim, Ya-Qiu Jin, M. Starič, Y. Ushiroda, N. Gabyshev, D. Červenkov, B. G. Fulsom, Bruce Yabsley, P. K. Behera, V. Vorobyev, Jyoti Prakash Biswal, Seema Bahinipati, T. E. Browder, T. V. Dong, Y. Choi, Seokhee Park, L. Santelj, K. H. Kang, Y. Unno, R. Pestotnik, M. Campajola, T. Bilka, J. H. Yin, S. Korpar, Seongbae Yang, I. Adachi, K.-H. Kim, W. Sutcliffe, Y. Onuki, V. Gaur, W. B. Yan, H. Hayashii, O. Hartbrich, N. Dash, G. De Nardo, M. Mrvar, C. H. Kim, F. Tenchini, V. Savinov, E.-J. Jang, Z. Natkaniec, T. Podobnik, T. Sumiyoshi, M. Nakao, Rahul Kumar, U. Tamponi, B. Golob, C. Kiesling, S. Ogawa, N. K. Nisar, M. Hernandez Villanueva, R. Mussa, T. Morii, Victoria Zhukova, T. Higuchi, Vladimir Popov, J. G. Shiu, Martin Ritter, H. B. Jeon, J. S. Lange, T. Sanuki, J. MacNaughton, J. Libby, A. Ishikawa, V.E. Shebalin, Y. Iwasaki, Y. J. Kwon, A. Chen, S. Jia, S. Nishida, V.N. Zhilich, E. Wang, V. M. Aulchenko, Z. S. Stottler, P. Križan, K. K. Joo, R. Ayad, N. Rout, Phillip Urquijo, M. Bračko, Doyen Sahoo, Y. Sakai, S. K. Choi, K. Lieret, X. L. Wang, Y. B. Li, T. Uglov, K. Miyabayashi, Kohei Ogawa, C. H. Wang, Y. Seino, M. T. Prim, S. Paul, J. V. Bennett, T. Mori, H. Aihara, Shoichi Watanuki, K. Inami, K. Nishimura, V. Chekelian, D. Cinabro, C. Z. Yuan, V. V. Zhulanov, E. Solovieva, G. Inguglia, E. Prencipe, S. Eidelman, X. P. Xu, M. Rozanska, D. Kotchetkov, P. Pakhlov, Shih-Chang Lee, Sudhanwa Patra, Samo Stanič, H. Park, A. Bozek, V. Bhardwaj, K. Tanida, T. K. Pedlar, H. Kichimi, R. Kroeger, M. E. Sevior, I. S. Lee, T. Matsuda, G. Bonvicini, A. Vinokurova, P. Krokovny, K. Cho, M. Uchida, L. K. Li, D. Liventsev, G. S. Varner, A. Rostomyan, P. Wang, M. V. Purohit, K. Senyo, T. Kawasaki, and S. Al Said
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Zero (complex analysis), Resonance, 01 natural sciences, law.invention, Standard Model, KEKB, law, 0103 physical sciences, CP violation, 010306 general physics, Collider
Abstract: We measure the time-dependent $C\!P$ violation parameters in $B^{0} \to K^{0}_{S}K^{0}_{S}K^{0}_{S}$ decays using $772 \times 10^6$ $B {\mkern 1.5mu\overline{\mkern-1.5mu B \mkern-0.1mu}\mkern 0.1mu}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The obtained mixing-induced and direct $C\!P$ asymmetries are $-0.71 \pm 0.23~{\rm(stat)} \pm 0.05~{\rm(syst)}$ and $0.12 \pm 0.16~{\rm(stat)} \pm 0.05~{\rm(syst)}$, respectively. These values are consistent with the Standard Model predictions. The significance of $C\!P$ violation differs from zero by 2.5 standard deviations.
Published: 2021

47. Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle

Author: J. Libby, D. M. Asner, K. Hayasaka, M. Bračko, B.A. Shwartz, E. Kovalenko, J. G. Shiu, M. Uchida, J. Biswal, M. Takizawa, Y. Seino, M. Starič, E. Prencipe, V. Bhardwaj, H. Nakazawa, M. T. Prim, Y. Jin, Phillip Urquijo, R. Kroeger, G. S. Varner, C.-L. Hsu, S. E. Vahsen, M. E. Sevior, Z. Doležal, P. Goldenzweig, V.N. Zhilich, Y. Kato, M. Sumihama, Y. B. Li, L. E. Piilonen, K. Trabelsi, C. MacQueen, R. Itoh, Y. Ushiroda, D. Epifanov, H. Hayashii, W. Sutcliffe, M. Campajola, K. Miyabayashi, A. Rostomyan, P. Oskin, E. Waheed, C. Sharma, Peter Kodys, W. W. Jacobs, B. G. Fulsom, D. Cinabro, L. Li Gioi, Tomoyuki Konno, Andrey Sokolov, Y. J. Kwon, Tagir Aushev, V. Zhukova, Y. Choi, G. Inguglia, M. Iwasaki, T. Podobnik, A. Korobov, M. Kumar, S. Uno, C. Schwanda, Y. Tao, H. Park, N. Rout, Y. Usov, R. Mizuk, Rocky Bala Garg, A. Bozek, M. Z. Wang, F. Di Capua, A. Frey, M. Röhrken, M. Niiyama, S.-J. Cho, V. Gaur, S. Nishida, Z. P. Zhang, X. L. Wang, S.-H. Park, J. Bennett, K. Tanida, Semen Eidelman, C. P. Shen, Seok Kim, Somnath Choudhury, S. Pardi, Dipak Kumar Sahoo, Sadaharu Uehara, T. Hara, Y. Unno, A. Sangal, G. B. Mohanty, Hiroaki Aihara, L. Nayak, V. Babu, A. Garmash, R. Van Tonder, Shih-Chang Lee, Y. Sakai, Samo Korpar, Steve K. Choi, Luka Santelj, R. Ayad, G. Schnell, S. Sandilya, T. Iijima, G. Pakhlova, P. Pakhlov, M. Merola, Y. Yusa, T. Ferber, C. H. Kim, F. Tenchini, A. K. Giri, A. Bobrov, D. Y. Kim, Bruce Yabsley, K. Senyo, D. Matvienko, D. Liventsev, C. Hadjivasiliou, V. Savinov, H. E. Cho, R. Pestotnik, Kohei Ogawa, M. Masuda, A. Natochii, T. Sumiyoshi, K. Inami, Iki Adachi, H. Ye, T. V. Dong, K. Matsuoka, K. Kumara, T. Kuhr, H. Kichimi, T. Uglov, E. Won, Z. S. Stottler, A. Ishikawa, K. Lieret, T. Sanuki, Felix Metzner, M. Nakao, G. Bonvicini, P. Križan, E. Wang, Jochen Dingfelder, W. B. Yan, K.-H. Kim, A. Vinokurova, O. Hartbrich, S. Cunliffe, O. Werbycka, M. Bessner, A. Kuzmin, M. Hernandez Villanueva, M. C. Chang, H. Atmacan, K. K. Joo, Y.-T. Lai, S. Ogawa, C. H. Wang, P. Krokovny, Rakesh Kumar, K. H. Kang, K. Cho, N. Gabyshev, D. Červenkov, N. K. Nisar, J. S. Lange, K. Uno, G.V. Russo, W. S. Hou, J. H. Yin, Florian Urs Bernlochner, C. Kiesling, N. Dash, E. Solovieva, S. Paul, A. Vossen, K. Nishimura, Frank Simon, Belle, Collaboration, Campajola, M., De Nardo, G., Di Capua, F., Merola, M., Pardi, S., Russo, G., and Et, Al.
Subjects: Nuclear and High Energy Physics, Particle physics, Physics beyond the Standard Model, QC770-798, +, 01 natural sciences, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, Radiative transfer, ddc:530, 010306 general physics, Flavor, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, e, High Energy Physics::Phenomenology, −, e +-e − Experiments, Belle experiment, Standard Model (mathematical formulation), Full data, High Energy Physics::Experiment, Experiments, Lepton
Abstract: Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ± → ℓ±γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, $$ \mathcal{B} $$ B (τ± → μ±γ) ≤ 4.2 × 10−8 and $$ \mathcal{B} $$ B (τ± → e±γ) ≤ 5.6 × 10−8, are set at 90% confidence level.
Published: 2021

48. Measurements of branching fractions and asymmetry parameters of $ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $, $ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $, and $ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $ decays at Belle

Author: Tagir Aushev, M. Bračko, V. Zhukova, Y. Onuki, G. De Nardo, E. Prencipe, G. Schnell, T. Iijima, Felix Metzner, F. Tenchini, H. Park, A. Bozek, V.M. Aulchenko, T. Sumiyoshi, T. Kuhr, V.N. Zhilich, Y. Kato, K. K. Joo, H. Miyata, Prafulla Kumar Behera, K. Miyabayashi, R. Mizuk, Andrey Sokolov, Iki Adachi, T. Podobnik, H. E. Cho, G. B. Mohanty, Y. Yusa, L. Nayak, V. Babu, Semen Eidelman, R. Mussa, C. MacQueen, S. Cunliffe, A. Bobrov, A. Ishikawa, M. Nakao, M. Niiyama, P. Križan, A. Garmash, V. Savinov, R. Dhamija, D. Liventsev, D. Epifanov, M. C. Chang, T. Ferber, T. Bilka, N. K. Nisar, M. Iwasaki, B. G. Cheon, Shih-Chang Lee, S. Pardi, M. Watanabe, C.-L. Hsu, Y. Iwasaki, J. S. Lange, K. Uno, L. E. Piilonen, M. Campajola, T. E. Browder, T. Uglov, P. Oskin, Y. J. Kwon, C. H. Kim, R. Ayad, K. Chilikin, K. Trabelsi, J. Li, C. Sharma, Peter Kodys, Seema Bahinipati, S. Nishida, Y. Choi, W. W. Jacobs, V. Popov, Z. P. Zhang, V. Gaur, S. K. Choi, H. Hayashii, N. Rout, M. Bessner, K.-H. Kim, J. Biswal, L. K. Li, D. Y. Kim, Tomoyuki Konno, M. Nayak, K. Flood, E. Won, J. H. Yin, V. Chekelian, Bruce Yabsley, G. Karyan, Seongbae Yang, M. Z. Wang, K. Kinoshita, S. Das, S.-J. Cho, C. H. Wang, S.-H. Park, O. Werbycka, R. Pestotnik, A. K. Giri, S. Paul, J. Bennett, S. Jia, R. Van Tonder, G. Pakhlova, S. Al Said, T. Matsuda, H. Ono, M. Masuda, J. Libby, D. M. Asner, K. Hayasaka, S. Sandilya, H. Ye, S. Patra, C. Z. Yuan, Dipak Kumar Sahoo, J. T. McNeil, G. Bonvicini, C. P. Shen, G.V. Russo, Seok Kim, E. Kovalenko, T. V. Dong, M. Starič, W. S. Hou, J. G. Shiu, Yongsun Kim, K. Lalwani, Y. Seino, Y. Unno, O. Hartbrich, S. Uno, C. Schwanda, M. Sumihama, P. Krokovny, Y. Jin, Rocky Bala Garg, M. T. Prim, Phillip Urquijo, Kohei Ogawa, M. Takizawa, L. Li Gioi, A. Korobov, A. Kuzmin, Sadaharu Uehara, A. Natochii, K. Cho, R. Kroeger, D. Cinabro, Y. B. Li, K. Inami, John Yelton, Z. Doležal, S. Ogawa, H. Aihara, Y. Usov, M. E. Sevior, H. Kichimi, P. Goldenzweig, Somnath Choudhury, N. Gabyshev, D. Červenkov, A. Chen, A. Sangal, M. Merola, E. Waheed, K. Senyo, K. Tanida, D. Matvienko, G. S. Varner, R. Itoh, S. S. Tang, A. Rostomyan, P. L. Wang, B. G. Fulsom, K. Kumara, Z. S. Stottler, Samo Korpar, F. Di Capua, P. Pakhlov, W. B. Yan, K. Nishimura, K. Lieret, and E. Solovieva
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, media_common.quotation_subject, Sigma, Lambda, 01 natural sciences, Asymmetry, Combinatorics, 0103 physical sciences, ddc:530, 010306 general physics, media_common
Abstract: Using a data sample of 980 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we study the processes of $$ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $$ Ξ c 0 → Λ K ¯ ∗ 0 , $$ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $$ Ξ c 0 → Σ 0 K ¯ ∗ 0 , and $$ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $$ Ξ c 0 → Σ + K ∗ − for the first time. The relative branching ratios to the normalization mode of $$ {\Xi}_c^0\to {\Xi}^{-}{\pi}^{+} $$ Ξ c 0 → Ξ − π + are measured to be$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.18\pm 0.02\left(\mathrm{stat}.\right)\pm 0.01\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.69\pm 0.03\left(\mathrm{stat}.\right)\pm 0.03\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.34\pm 0.06\left(\mathrm{stat}.\right)\pm 0.02\left(\mathrm{syst}.\right),\end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ − / B Ξ c 0 → Ξ − π + = 0.34 ± 0.06 stat . ± 0.02 syst . , where the uncertainties are statistical and systematic, respectively. We obtain$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)=\left(3.3\pm 0.3\left(\mathrm{stat}.\right)\pm 0.2\left(\mathrm{syst}.\right)\pm 1.0\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)=\left(12.4\pm 0.5\left(\mathrm{stat}.\right)\pm 0.5\left(\mathrm{syst}.\right)\pm 3.6\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast 0}\right)=\left(6.1\pm 1.0\left(\mathrm{stat}.\right)\pm 0.4\left(\mathrm{syst}.\right)\pm 1.8\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 = 3.3 ± 0.3 stat . ± 0.2 syst . ± 1.0 ref . × 10 − 3 , B Ξ c 0 → Σ 0 K ¯ ∗ 0 = 12.4 ± 0.5 stat . ± 0.5 syst . ± 3.6 ref . × 10 − 3 , B Ξ c 0 → Σ + K ∗ 0 = 6.1 ± 1.0 stat . ± 0.4 syst . ± 1.8 ref . × 10 − 3 , where the uncertainties are statistical, systematic, and from $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$ B Ξ c 0 → Ξ − π + , respectively. The asymmetry parameters $$ \alpha \left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right) $$ α Ξ c 0 → Λ K ¯ ∗ 0 and $$ \alpha \left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right) $$ α Ξ c 0 → Σ + K ∗ − are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.
Published: 2021

49. Search for a doubly charged DDK bound state in ϒ(1S, 2S) inclusive decays and via direct production in e+e− collisions at s=10.520 , 10.580, and 10.867 GeV

Author: R. Mussa, H. Miyata, Prafulla Kumar Behera, H. B. Jeon, A. Ishikawa, S. Al Said, H. Ye, M. Nakao, P. Križan, M. Uchida, Saraju P. Mohanty, Yongsun Kim, K. Lalwani, C. Schwanda, V. Bhardwaj, L. Santelj, S. Watanuki, Z. P. Zhang, M. Z. Wang, K. Kinoshita, C. Z. Yuan, E. Prencipe, G. S. Varner, R. Kulasiri, U. Tamponi, M. Shapkin, M. Röhrken, K. Chilikin, S. E. Vahsen, V.N. Zhilich, A. B. Kaliyar, W. Sutcliffe, M. Sumihama, D. Epifanov, S. Nishida, Martin Florian Bessner, J. Bennett, A. Rostomyan, P. Wang, B. G. Fulsom, Y. Iwasaki, J. G. Shiu, T. K. Pedlar, J. Schueler, G. Schnell, L. K. Li, K. Miyabayashi, R. Ayad, Seema Bahinipati, Jochen Dingfelder, W. B. Yan, Y. J. Kwon, V. Gaur, C. H. Wang, G. Pakhlova, R. Pestotnik, Dipak Kumar Sahoo, Seongbae Yang, C. W. Joo, Y. B. Li, K. Tanida, E. Won, L. Li Gioi, G. De Nardo, M. T. Hedges, N. Rout, S. Jia, T. Matsuda, S. Uno, Tagir Aushev, Y. Onuki, T. Kuhr, C. MacQueen, C. H. Li, M. Iwasaki, B. G. Cheon, M. Niiyama, Jyoti Prakash Biswal, A. Garmash, Andrey Sokolov, G. Bonvicini, A. Vinokurova, A. Natochii, T. Bilka, D. Y. Kim, K. Inami, Z. J. Liptak, R. Itoh, P. Krokovny, F. Tenchini, M. Campajola, K. Belous, S. Korpar, M. Watanabe, S. Sandilya, T. Podobnik, T. Sumiyoshi, Rakesh Kumar, K. H. Kang, K. Cho, S. C. Lee, F. Di Capua, Martin Ritter, Victoria Zhukova, B.A. Shwartz, I. Adachi, Semen Eidelman, A. Chen, T. Sanuki, S. Pardi, M. Starič, L. E. Piilonen, P. Oskin, H. Hayashii, E. Wang, L. Nayak, V. Babu, Vladimir Zhulanov, Y. Jin, T. Uglov, T. Ferber, R. Kroeger, Bruce Yabsley, M. E. Sevior, I. S. Lee, S. Cunliffe, P. Goldenzweig, J. Libby, D. M. Asner, K. Hayasaka, T. Mori, H. Aihara, M. C. Chang, G. Inguglia, Y. Guan, Tomoyuki Konno, K. Kumara, Y. Seino, M. T. Prim, Takeo Kawasaki, S.-J. Cho, Z. S. Stottler, D. Cinabro, P. Chang, M. Kumar, C. P. Shen, Seok Kim, M. Takizawa, Somnath Choudhury, D. Matvienko, Seokhee Park, John Yelton, Z. Doležal, K. Kim, H. Ono, S. K. Choi, M. Nayak, N. K. Nisar, J. S. Lange, R. Mizuk, T. Pang, S. Patra, Yoshinobu Unno, A. K. Giri, K. Sumisawa, M. Masuda, T. V. Dong, C.-L. Hsu, W. S. Hou, J. Li, C. Sharma, Peter Kodys, W. W. Jacobs, G. Karyan, V. Vorobyev, Y. Choi, V. Popov, Y. Sakai, O. Hartbrich, G. B. Mohanty, K. Lieret, K. K. Joo, N. Dash, E. Solovieva, X. P. Xu, S. Paul, D. Kotchetkov, B. Bhuyan, T. E. Browder, V. Savinov, R. Van Tonder, P. Pakhlov, G. Russo, H. Park, A. Bozek, Z. Natkaniec, D. Červenkov, J. H. Yin, S. Das, C. Kiesling, M. Bračko, A. Sangal, Rocky Bala Garg, M. Merola, K. Senyo, and C. Hadjivasiliou
Subjects: Physics, Direct production, Particle physics, KEKB, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Bound state, 010306 general physics, 01 natural sciences, Spectral line
Abstract: We report the results of a first search for a doubly charged DDK bound state, denoted the R++, in ϒ(1S) and ϒ(2S) inclusive decays and via direct production in e+e- collisions at s=10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy e+e- collider. No significant signals are observed in the D+Ds∗+ invariant-mass spectra of all studied modes. The 90% credibility level upper limits on their product branching fractions in ϒ(1S) and ϒ(2S) inclusive decays (B(ϒ(1S, 2S)→R+++anything)×B(R++→D+Ds∗+)), the product values of Born cross section and branching fraction in e+e- collisions (σ(e+e-→R+++anything)×B(R++→D+Ds∗+)) at s=10.520, 10.580, and 10.867 GeV under different assumptions of R++ masses varying from 4.13 to 4.17 GeV/c2 and widths varying from 0 to 5 MeV are obtained.
Published: 2020

50. Search for transitions from ϒ(4S) and ϒ(5S) to ηb(1S) and ηb(2S) with emission of an ω meson

Author: K. Miyabayashi, W. B. Yan, Jyoti Prakash Biswal, A. Garmash, P. Goldenzweig, C.-L. Hsu, L. Nayak, Seongbae Yang, S. Pardi, T. Aushev, S. Sandilya, U. Tamponi, H. Nakazawa, Peter Kodys, Vladimir Popov, M. Campajola, W. W. Jacobs, T. Ferber, V. Gaur, R. Mussa, G. Schnell, M. Niiyama, S. Jia, T. Matsuda, Deepak Kumar Sahoo, M. Starič, D. M. Asner, A. B. Kaliyar, P. K. Behera, H. Ono, X. P. Xu, H. Aihara, A. Ishikawa, M. Nakao, T. Iijima, G. Karyan, C. W. Joo, D. Kotchetkov, G. Bonvicini, Motoki Iwasaki, F. Tenchini, C. Hadjivasiliou, J. Schueler, A. Vinokurova, S. Dubey, V. Aulchenko, P. Krokovny, Kohei Ogawa, Bruce Yabsley, S. E. Vahsen, T. J. Moon, A. Natochii, P. Oskin, S. K. Choi, Y. Onuki, P. Križan, R. Mizuk, T. Podobnik, Y. Sakai, K. Inami, S. Ogawa, Y. Iwasaki, F. Di Capua, K. H. Kang, K. Cho, D. Epifanov, Soumya D. Mohanty, E. Won, C. H. Wang, S. Paul, L. Li Gioi, M. Nayak, Y. J. Kwon, K. Kumara, E. Wang, E. Waheed, M. Hernandez Villanueva, V. Bhardwaj, T. K. Pedlar, H. Ye, C. Z. Yuan, E. Prencipe, K. Lieret, C. H. Li, T. Sanuki, S. Wehle, R. Dhamija, N. Rout, Z. S. Stottler, J. Libby, Ya-Qiu Jin, Victoria Zhukova, L. K. Li, D. Liventsev, A. K. Giri, M. Z. Wang, K. Kinoshita, D. Y. Kim, Y. Unno, T. Uglov, A. Chen, E. Solovieva, K. Trabelsi, A. Sangal, J. H. Yin, G. S. Varner, M. Shapkin, C. P. Shen, Z. P. Zhang, S. Cunliffe, Martin Florian Bessner, Y. Seino, M. Masuda, R. Kroeger, K. Chilikin, M. Takizawa, G. B. Mohanty, R. Ayad, M. E. Sevior, M. T. Prim, M. Merola, R. Itoh, H. Miyata, K. Sumisawa, G. De Nardo, M. T. Hedges, A. Rostomyan, K. Tanida, P. Wang, Shoichi Watanuki, K. Gudkova, L. Cao, H. Atmacan, Rahul Kumar, D. Cinabro, R. Pestotnik, John Yelton, Z. Doležal, Andrey Sokolov, B. Golob, T. V. Dong, H. Kichimi, Y. Choi, Z. J. Liptak, T. Hara, L. Santelj, L. E. Piilonen, J. Wiechczynski, N. K. Nisar, T. Bilka, Seokhee Park, H. Hayashii, G. Pakhlova, Yongsun Kim, S. Uno, C. Schwanda, R. Kulasiri, P. Chang, O. Hartbrich, C. H. Kim, H. E. Cho, M. Watanabe, J. C. Dingfelder, J. S. Lange, K. Senyo, T. Pang, J. V. Bennett, T. Mori, Y. Usov, Semen Eidelman, Y. Yusa, G.V. Russo, Somnath Choudhury, W. S. Hou, Felix Metzner, V. Vorobyev, K. K. Joo, B. G. Cheon, K. Belous, S. Korpar, S. C. Lee, J. G. Shiu, S. Nishida, V. Chekelian, R. Van Tonder, R. B. Garg, B. Bhuyan, B. G. Fulsom, T. E. Browder, V. Savinov, P. Pakhlov, Philip Lewis, H. Park, A. Bozek, C. Kiesling, M. Bračko, N. Gabyshev, D. Červenkov, V.N. Zhilich, and D. Ferlewicz
Subjects: Physics, Particle physics, KEKB, Meson, 010308 nuclear & particles physics, law, 0103 physical sciences, 010306 general physics, Collider, 01 natural sciences, Belle experiment, law.invention
Abstract: Using data collected in the Belle experiment at the KEKB asymmetric-energy e+e− collider we search for transitions Υ(4S)→ η$_{b}$(1S)ω, Υ(5S)→η$_{b}$(1S)ω and Υ(5S)→η$_{b}$(2S)ω. No significant signals are observed and we set 90% confidence level upper limits on the corresponding visible cross sections: 0.2 pb, 0.4 pb and 1.9 pb, respectively.
Published: 2020

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