Observation of time-dependent 
CP
 violation and measurement of the branching fraction of 
B0→J/ψπ0
 decays

Adachi, I.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Aloisio, A.; Althubiti, N.; Anh Ky, N.; Asner, D.  M.; Atmacan, H.; Aushev, V.; Aversano, M.; Ayad, R.; Babu, V.; Bae, H.; Baghel, N.  K.; Bahinipati, S.; Bambade, P.; Banerjee, Sw.; Bansal, S.; Baudot, J.; Baur, A.; Beaubien, A.; Becherer, F.; Becker, J.; Bennett, J.  V.; Bernlochner, F.  U.; Bertacchi, V.; Bertemes, M.; Bertholet, E.; Bessner, M.; Bettarini, S.; Bhardwaj, V.; Bianchi, F.; Bilka, T.; Biswas, D.; Bobrov, A.; Bodrov, D.; Bondar, A.; Borah, J.; Boschetti, A.; Bozek, A.; Bračko, M.; Branchini, P.; Briere, R.  A.; Browder, T.  E.; Budano, A.; Bussino, S.; Campagna, Q.; Campajola, M.; Cao, L.; Casarosa, G.; Cecchi, C.; Cerasoli, J.; Chang, M. -C.; Chang, P.; Cheaib, R.; Cheema, P.; Chen, C.; Cheon, B.  G.; Chilikin, K.; Chirapatpimol, K.; Cho, H. -E.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choudhury, S.; Cochran, J.; Corona, L.; Cui, J.  X.; De La Cruz-Burelo, E.; De La Motte, S.  A.; De Nardo, G.; De Pietro, G.; de Sangro, R.; Destefanis, M.; Dhamija, R.; Di Canto, A.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Dong, T.  V.; Dorigo, M.; Dubey, S.; Dugic, K.; Dujany, G.; Ecker, P.; Epifanov, D.; Feichtinger, P.; Ferber, T.; Fillinger, T.; Finck, C.; Finocchiaro, G.; Fodor, A.; Forti, F.; Fulsom, B.  G.; Gabrielli, A.; Ganiev, E.; Garcia-Hernandez, M.; Garg, R.; Gaudino, G.; Gaur, V.; Gaz, A.; Gellrich, A.; Ghevondyan, G.; Ghosh, D.; Ghumaryan, H.; Giakoustidis, G.; Giordano, R.; Giri, A.; Gironella, P.; Glazov, A.; Gobbo, B.; Godang, R.; Gogota, O.; Goldenzweig, P.; Gradl, W.; Granderath, S.; Graziani, E.; Gruberová, Z.; Guan, Y.; Gudkova, K.; Haide, I.; Han, Y.; Hara, T.; Hayashii, H.; Hazra, S.; Hearty, C.; Heidelbach, A.; Heredia de la Cruz, I.; Hernández Villanueva, M.; Higuchi, T.; Hoek, M.; Hohmann, M.; Hoppe, R.; Horak, P.; Hsu, C. -L.; Humair, T.; Iijima, T.; Inami, K.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jackson, P.; Jacobs, W.  W.; Jang, E. -J.; Jia, S.; Jin, Y.; Johnson, A.; Joo, K.  K.; Junkerkalefeld, H.; Kalita, D.; Kandra, J.; Kang, K.  H.; Kang, S.; Kawasaki, T.; Keil, F.; Ketter, C.; Kiesling, C.; Kim, C. -H.; Kim, D.  Y.; Kim, J. -Y.; Kim, K. -H.; Kim, Y. -K.; Kim, Y.  J.; Kinoshita, K.; Kodyš, P.; Koga, T.; Kohani, S.; Kojima, K.; Korobov, A.; Korpar, S.; Kovalenko, E.; Kowalewski, R.; Križan, P.; Krokovny, P.; Kuhr, T.; Kulii, Y.; Kumar, D.; Kumar, R.; Kumara, K.; Kunigo, T.; Kuzmin, A.; Kwon, Y. -J.; Lai, Y. -T.; Lalwani, K.; Lam, T.; Lau, T.  S.; Laurenza, M.; Leboucher, R.; Le Diberder, F.  R.; Lee, M.  J.; Lemettais, C.; Leo, P.; L.  K., Li; Q.  M., Li; W.  Z., Li; Li, Y.; Y.  B., Li; Liao, Y.  P.; Libby, J.; Lin, J.; Liu, M.  H.; Liu, Q.  Y.; Liu, Y.; Liu, Z.  Q.; Liventsev, D.; Longo, S.; Lueck, T.; Lyu, C.; Maggiora, M.; Maharana, S.  P.; Maiti, R.; Mancinelli, G.; Manfredi, R.; Manoni, E.; Mantovano, M.; Marcantonio, D.; Marcello, S.; Marinas, C.; Martellini, C.; Martens, A.; Martini, A.; Martinov, T.; Massaccesi, L.; Masuda, M.; Maurya, S.  K.; Mckenna, J.  A.; Mehta, R.; Meier, F.; Merola, M.; Miller, C.; Mirra, M.; Mitra, S.; Miyabayashi, K.; Mohanty, G.  B.; Mondal, S.; Moneta, S.; Moser, H. -G.; Mussa, R.; Nakamura, I.; Nakao, M.; Nakazawa, Y.; Naruki, M.; Natkaniec, Z.; Natochii, A.; Nayak, M.; Nazaryan, G.; Neu, M.; Nishida, S.; Ogawa, S.; Ono, H.; Onuki, Y.; Otani, F.; Pakhlov, P.; Pakhlova, G.; Paoloni, E.; Pardi, S.; Park, H.; Park, J.; Park, K.; Park, S. -H.; Paschen, B.; Passeri, A.; Pedlar, T.  K.; Peruzzi, I.; Peschke, R.; Pestotnik, R.; Piccolo, M.; Piilonen, L.  E.; Podobnik, T.; Pokharel, S.; Praz, C.; Prell, S.; Prencipe, E.; Prim, M.  T.; Prudiiev, I.; Purwar, H.; Rados, P.; Raeuber, G.; Raiz, S.; Rauls, N.; Reif, M.; Reiter, S.; Remnev, M.; Reuter, L.; Ripp-Baudot, I.; Rizzo, G.; Roehrken, M.; Roney, J.  M.; Rostomyan, A.; Rout, N.; Sanders, D.  A.; Sandilya, S.; Santelj, L.; Savinov, V.; Scavino, B.; Schmitt, C.; Schneider, S.; Schnepf, M.; Schoenning, K.; Schwanda, C.; Schwartz, A.  J.; Seino, Y.; Selce, A.; Senyo, K.; Serrano, J.; Sevior, M.  E.; Sfienti, C.; Shan, W.; Sharma, C.; Shen, C.  P.; Shi, X.  D.; Shillington, T.; Shimasaki, T.; Shiu, J. -G.; Shtol, D.; Shwartz, B.; Sibidanov, A.; Simon, F.; Singh, J.  B.; Skorupa, J.; Sobie, R.  J.; Sobotzik, M.; Soffer, A.; Sokolov, A.; Solovieva, E.; Spataro, S.; Spruck, B.; Song, W.; Starič, M.; Stavroulakis, P.; Stefkova, S.; Stroili, R.; Strube, J.; Sue, Y.; Sumihama, M.; Sumisawa, K.; Sutcliffe, W.; Suwonjandee, N.; Svidras, H.; Takahashi, M.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Thaller, A.; Tittel, O.; Tiwary, R.; Torassa, E.; Trabelsi, K.; Tsaklidis, I.; Uchida, M.; Ueda, I.; Unger, K.; Unno, Y.; Uno, K.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Vahsen, S.  E.; van Tonder, R.; Veronesi, M.; Vismaya, V.  S.; Vitale, L.; Vobbilisetti, V.; Volpe, R.; Wakai, M.; Wallner, S.; Wang, M. -Z.; Wang, X.  L.; Wang, Z.; Warburton, A.; Watanuki, S.; Wessel, C.; Won, E.; X.  P., Xu; Yabsley, B.  D.; Yamada, S.; Yan, W.; Yelton, J.; Yin, J.  H.; Yoshihara, K.; Yusa, Y.; Zani, L.; Zeng, F.; Zhang, B.; Zhilich, V.; Zhou, J.  S.; Zhou, Q.  D.; Zhukova, V.  I.; Žlebčík, R.

doi:10.1103/physrevd.111.012011

We present a measurement of the branching fraction and time-dependent charge-parity (CP) decay-rate asymmetries in B0→J/ψπ0 decays. The data sample was collected with the Belle II detector at the SuperKEKB asymmetric e+e- collider in 2019-2022 and contains (387±6)×106 BB¯ meson pairs from ϒ(4S) decays. We reconstruct 392±24 signal decays and fit the CP parameters from the distribution of the proper-decay-time difference of the two B mesons. We measure the branching fraction to be (B0→J/ψπ0)=(2.00±0.12±0.09)×10-5 and the direct and mixing-induced CP asymmetries to be CCP=0.13±0.12±0.03 and SCP=-0.88±0.17±0.03, respectively, where the first uncertainties are statistical and the second are systematic. We observe mixing-induced CP violation with a significance of 5.0 standard deviations for the first time in this mode.

Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2025). Observation of time-dependent CP violation and measurement of the branching fraction of B0→J/ψπ0 decays. PHYSICAL REVIEW D, 111(1), 012011-1-012011-12 [10.1103/physrevd.111.012011].

Observation of time-dependent CP violation and measurement of the branching fraction of B0→J/ψπ0 decays

Adachi, I.;Aggarwal, L.;Ahmed, H.;Aihara, H.;Akopov, N.;Aloisio, A.;Althubiti, N.;Anh Ky, N.;Asner, D. M.;Atmacan, H.;Aushev, V.;Aversano, M.;Ayad, R.;Babu, V.;Bae, H.;Baghel, N. K.;Bahinipati, S.;Bambade, P.;Banerjee, Sw.;Bansal, S.;Baudot, J.;Baur, A.;Beaubien, A.;Becherer, F.;Becker, J.;Bennett, J. V.;Bernlochner, F. U.;Bertacchi, V.;Bertemes, M.;Bertholet, E.;Bessner, M.;Bettarini, S.;Bhardwaj, V.;Bianchi, F.;Bilka, T.;Biswas, D.;Bobrov, A.;Bodrov, D.;Bondar, A.;Borah, J.;Boschetti, A.;Bozek, A.;Bračko, M.;Branchini, P.^{Membro del Collaboration Group};Briere, R. A.;Browder, T. E.;Budano, A.^{Membro del Collaboration Group};Bussino, S.^{Membro del Collaboration Group};Campagna, Q.;Campajola, M.;Cao, L.;Casarosa, G.;Cecchi, C.;Cerasoli, J.;Chang, M. -C.;Chang, P.;Cheaib, R.;Cheema, P.;Chen, C.;Cheon, B. G.;Chilikin, K.;Chirapatpimol, K.;Cho, H. -E.;Cho, K.;Cho, S. -J.;Choi, S. -K.;Choudhury, S.;Cochran, J.;Corona, L.;Cui, J. X.;De La Cruz-Burelo, E.;De La Motte, S. A.;De Nardo, G.;De Pietro, G.^{Membro del Collaboration Group};de Sangro, R.;Destefanis, M.;Dhamija, R.;Di Canto, A.;Di Capua, F.;Dingfelder, J.;Doležal, Z.;Dong, T. V.;Dorigo, M.;Dubey, S.;Dugic, K.;Dujany, G.;Ecker, P.;Epifanov, D.;Feichtinger, P.;Ferber, T.;Fillinger, T.;Finck, C.;Finocchiaro, G.;Fodor, A.;Forti, F.;Fulsom, B. G.;Gabrielli, A.;Ganiev, E.;Garcia-Hernandez, M.;Garg, R.;Gaudino, G.;Gaur, V.;Gaz, A.;Gellrich, A.;Ghevondyan, G.;Ghosh, D.;Ghumaryan, H.;Giakoustidis, G.;Giordano, R.;Giri, A.;Gironella, P.;Glazov, A.;Gobbo, B.;Godang, R.;Gogota, O.;Goldenzweig, P.;Gradl, W.;Granderath, S.;Graziani, E.;Gruberová, Z.;Guan, Y.;Gudkova, K.;Haide, I.;Han, Y.;Hara, T.;Hayashii, H.;Hazra, S.;Hearty, C.;Heidelbach, A.;Heredia de la Cruz, I.;Hernández Villanueva, M.;Higuchi, T.;Hoek, M.;Hohmann, M.;Hoppe, R.;Horak, P.;Hsu, C. -L.;Humair, T.;Iijima, T.;Inami, K.;Ipsita, N.;Ishikawa, A.;Itoh, R.;Iwasaki, M.;Jackson, P.;Jacobs, W. W.;Jang, E. -J.;Jia, S.;Jin, Y.;Johnson, A.;Joo, K. K.;Junkerkalefeld, H.;Kalita, D.;Kandra, J.;Kang, K. H.;Kang, S.;Kawasaki, T.;Keil, F.;Ketter, C.;Kiesling, C.;Kim, C. -H.;Kim, D. Y.;Kim, J. -Y.;Kim, K. -H.;Kim, Y. -K.;Kim, Y. J.;Kinoshita, K.;Kodyš, P.;Koga, T.;Kohani, S.;Kojima, K.;Korobov, A.;Korpar, S.;Kovalenko, E.;Kowalewski, R.;Križan, P.;Krokovny, P.;Kuhr, T.;Kulii, Y.;Kumar, D.;Kumar, R.;Kumara, K.;Kunigo, T.;Kuzmin, A.;Kwon, Y. -J.;Lai, Y. -T.;Lalwani, K.;Lam, T.;Lau, T. S.;Laurenza, M.^{Membro del Collaboration Group};Leboucher, R.;Le Diberder, F. R.;Lee, M. J.;Lemettais, C.;Leo, P.;Li, L. K.;Li, Q. M.;Li, W. Z.;Li, Y.;Li, Y. B.;Liao, Y. P.;Libby, J.;Lin, J.;Liu, M. H.;Liu, Q. Y.;Liu, Y.;Liu, Z. Q.;Liventsev, D.;Longo, S.;Lueck, T.;Lyu, C.;Maggiora, M.;Maharana, S. P.;Maiti, R.;Mancinelli, G.;Manfredi, R.;Manoni, E.;Mantovano, M.;Marcantonio, D.;Marcello, S.;Marinas, C.;Martellini, C.^{Membro del Collaboration Group};Martens, A.;Martini, A.^{Membro del Collaboration Group};Martinov, T.;Massaccesi, L.;Masuda, M.;Maurya, S. K.;McKenna, J. A.;Mehta, R.;Meier, F.;Merola, M.;Miller, C.;Mirra, M.;Mitra, S.;Miyabayashi, K.;Mohanty, G. B.;Mondal, S.;Moneta, S.;Moser, H. -G.;Mussa, R.;Nakamura, I.;Nakao, M.;Nakazawa, Y.;Naruki, M.;Natkaniec, Z.;Natochii, A.;Nayak, M.;Nazaryan, G.;Neu, M.;Nishida, S.;Ogawa, S.;Ono, H.;Onuki, Y.;Otani, F.;Pakhlov, P.;Pakhlova, G.;Paoloni, E.;Pardi, S.;Park, H.;Park, J.;Park, K.;Park, S. -H.;Paschen, B.;Passeri, A.;Pedlar, T. K.;Peruzzi, I.;Peschke, R.;Pestotnik, R.;Piccolo, M.;Piilonen, L. E.;Podobnik, T.;Pokharel, S.;Praz, C.;Prell, S.;Prencipe, E.;Prim, M. T.;Prudiiev, I.;Purwar, H.;Rados, P.;Raeuber, G.;Raiz, S.;Rauls, N.;Reif, M.;Reiter, S.;Remnev, M.;Reuter, L.;Ripp-Baudot, I.;Rizzo, G.;Roehrken, M.;Roney, J. M.;Rostomyan, A.;Rout, N.;Sanders, D. A.;Sandilya, S.;Santelj, L.;Savinov, V.;Scavino, B.;Schmitt, C.;Schneider, S.;Schnepf, M.;Schoenning, K.;Schwanda, C.;Schwartz, A. J.;Seino, Y.;Selce, A.;Senyo, K.;Serrano, J.;Sevior, M. E.;Sfienti, C.;Shan, W.;Sharma, C.;Shen, C. P.;Shi, X. D.;Shillington, T.;Shimasaki, T.;Shiu, J. -G.;Shtol, D.;Shwartz, B.;Sibidanov, A.;Simon, F.;Singh, J. B.;Skorupa, J.;Sobie, R. J.;Sobotzik, M.;Soffer, A.;Sokolov, A.;Solovieva, E.;Spataro, S.;Spruck, B.;Song, W.;Starič, M.;Stavroulakis, P.;Stefkova, S.;Stroili, R.;Strube, J.;Sue, Y.;Sumihama, M.;Sumisawa, K.;Sutcliffe, W.;Suwonjandee, N.;Svidras, H.;Takahashi, M.;Takizawa, M.;Tamponi, U.;Tanida, K.;Tenchini, F.;Thaller, A.;Tittel, O.;Tiwary, R.;Torassa, E.;Trabelsi, K.;Tsaklidis, I.;Uchida, M.;Ueda, I.;Unger, K.;Unno, Y.;Uno, K.;Uno, S.;Urquijo, P.;Ushiroda, Y.;Vahsen, S. E.;van Tonder, R.;Veronesi, M.;Vismaya, V. S.;Vitale, L.;Vobbilisetti, V.;Volpe, R.;Wakai, M.;Wallner, S.;Wang, M. -Z.;Wang, X. L.;Wang, Z.;Warburton, A.;Watanuki, S.;Wessel, C.;Won, E.;Xu, X. P.;Yabsley, B. D.;Yamada, S.;Yan, W.;Yelton, J.;Yin, J. H.;Yoshihara, K.;Yusa, Y.;Zani, L.;Zeng, F.;Zhang, B.;Zhilich, V.;Zhou, J. S.;Zhou, Q. D.;Zhukova, V. I.;Žlebčík, R.

2025-01-01

Abstract

We present a measurement of the branching fraction and time-dependent charge-parity (CP) decay-rate asymmetries in B0→J/ψπ0 decays. The data sample was collected with the Belle II detector at the SuperKEKB asymmetric e+e- collider in 2019-2022 and contains (387±6)×106 BB¯ meson pairs from ϒ(4S) decays. We reconstruct 392±24 signal decays and fit the CP parameters from the distribution of the proper-decay-time difference of the two B mesons. We measure the branching fraction to be (B0→J/ψπ0)=(2.00±0.12±0.09)×10-5 and the direct and mixing-induced CP asymmetries to be CCP=0.13±0.12±0.03 and SCP=-0.88±0.17±0.03, respectively, where the first uncertainties are statistical and the second are systematic. We observe mixing-induced CP violation with a significance of 5.0 standard deviations for the first time in this mode.

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				2025
			
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				Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2025). Observation of time-dependent 
CP
 violation and measurement of the branching fraction of 
B0→J/ψπ0
 decays. PHYSICAL REVIEW D, 111(1), 012011-1-012011-12 [10.1103/physrevd.111.012011].
			
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/503056

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Observation of time-dependent CP violation and measurement of the branching fraction of B0→J/ψπ0 decays

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