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.

Scheda breve

Scheda completa

Scheda completa (DC)

	Anno di pubblicazione
	
				2025
			
	Citazione
	
				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].
			
	Appare nelle tipologie:
	
				1.1 Articolo in rivista

File in questo prodotto:

Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/503056

Citazioni

ND

0

ND

Nome	Dominio	Durata	Descrizione
s_.*	plu.mx	sessione	recupero grafico citazioni sociali da plumx
A_.*	core.ac.uk	7 giorni	recupero pubblicazioni consigliate per il pannello core-recommander
GS_.*	gstatic.com	richiesta http	visualizza grafico citazioni
CC_.*	creativecommons.org	richiesta http	visualizza licenza bitstream

Benvenuti nell'Anagrafe della Ricerca d'Ateneo

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

Membro del Collaboration Group

Membro del Collaboration Group

Membro del Collaboration Group

Membro del Collaboration Group

Membro del Collaboration Group

Membro del Collaboration Group

Membro del Collaboration Group

2025-01-01

Abstract

Scheda breve Scheda completa Scheda completa (DC)

Informazioni

Citazioni

social impact

Conferma cancellazione

Scheda breve

Scheda completa

Scheda completa (DC)