Test of lepton flavor universality with measurements of 
R(D+)
 and 
R(D*+)
 using semileptonic 
B
 tagging at the Belle II experiment

Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Alghamdi, S.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Amos, K.; Angelsmark, M.; Anh Ky, N.; Antonioli, C.; Asner, D.  m.; Atmacan, H.; Aushev, T.; Aushev, V.; Aversano, M.; Ayad, R.; Babu, V.; Bae, H.; Baghel, N.  k.; Bahinipati, S.; Bambade, P.; Banerjee, Sw.; Bansal, S.; Barrett, M.; Bartl, M.; Baudot, J.; Beaubien, A.; Becherer, F.; Becker, J.; Bennett, J.  v.; Bernlochner, F.  u.; Bertacchi, V.; Bertemes, M.; Bertholet, E.; Bessner, M.; Bettarini, S.; Bhardwaj, V.; Bhuyan, B.; Bianchi, F.; Bilka, T.; Biswas, D.; Bobrov, A.; Bodrov, D.; Bolz, A.; 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.; Cheon, B.  g.; Chilikin, K.; Chin, J.; Chirapatpimol, K.; Cho, H. -E.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choudhury, S.; Cochran, J.; Consigny, I.; 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.; Dey, S.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Domínguez Jiménez, I.; Dong, T.  v.; Dorigo, M.; Dossett, D.; 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.; Gale, A.; Ganiev, E.; Garcia-Hernandez, M.; Garg, R.; Gaudino, G.; Gaur, V.; Gautam, V.; Gaz, A.; Gellrich, A.; Ghevondyan, G.; Ghosh, D.; Ghumaryan, H.; Giakoustidis, G.; Giordano, R.; Giri, A.; Gironella Gironell, P.; Glazov, A.; Gobbo, B.; Godang, R.; Gogota, O.; Goldenzweig, P.; Gradl, W.; Granderath, S.; Graziani, E.; Greenwald, D.; Gruberová, Z.; Guan, Y.; Gudkova, K.; Haide, I.; Han, Y.; Hara, K.; Hara, T.; Harris, C.; Hayasaka, K.; Hayashii, H.; Hazra, S.; Hearty, C.; Hedges, M.  t.; Heredia De La Cruz, I.; Hernández Villanueva, M.; Higuchi, T.; Hoek, M.; Hohmann, M.; Hoppe, R.; Horak, P.; Hsu, C. -L.; Huang, A.; Humair, T.; Iijima, T.; Inami, K.; Inguglia, G.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jackson, P.; Jacobi, D.; Jacobs, W.  w.; Jaffe, D.  e.; Jang, E. -J.; Q.  p., Ji; Jia, S.; Jin, Y.; Johnson, A.; Joo, K.  k.; Junkerkalefeld, H.; Kaliyar, A.  b.; Kandra, J.; Kang, K.  h.; Kang, S.; Karyan, G.; Kawasaki, T.; Keil, F.; Ketter, C.; Khan, M.; Kiesling, C.; Kim, C. -H.; Kim, D.  y.; Kim, J. -Y.; Kim, K. -H.; Kim, Y. -K.; Kindo, H.; Kinoshita, K.; Kodyš, P.; Koga, T.; Kohani, S.; Kojima, K.; Korobov, A.; Korpar, S.; Kowalewski, R.; Križan, P.; Krokovny, P.; Kuhr, T.; Kulii, Y.; Kumar, D.; Kumar, J.; Kumara, K.; Kunigo, T.; Kuzmin, A.; Kwon, Y. -J.; Lacaprara, S.; Lai, Y. -T.; Lalwani, K.; Lam, T.; Lange, J.  s.; Lau, T.  s.; Laurenza, M.; Leboucher, R.; Le Diberder, F.  r.; Lee, M.  j.; Lemettais, C.; Leo, P.; Lewis, P.  m.; Li, C.; H. -J., Li; L.  k., Li; Q.  m., Li; W.  z., Li; Y.  b., Li; Liao, Y.  p.; Libby, J.; Lin, J.; Lin, S.; Liu, M.  h.; Liu, Q.  y.; Liu, Y.; Liu, Z.  q.; Liventsev, D.; Longo, S.; Lueck, T.; Lyu, C.; Ma, Y.; Madaan, C.; Maggiora, M.; Maharana, S.  p.; Maiti, R.; Mancinelli, G.; Manfredi, R.; Manoni, E.; Manthei, A.  c.; Mantovano, M.; Marcantonio, D.; Marcello, S.; Marinas, C.; Martellini, C.; Martens, A.; Martini, A.; Martinov, T.; Massaccesi, L.; Masuda, M.; Matvienko, D.; Maurya, S.  k.; Maushart, M.; Mckenna, J.  a.; Mehta, R.; Meier, F.; Meleshko, D.; Merola, M.; Metzner, F.; Miller, C.; Mirra, M.; Mitra, S.; Miyabayashi, K.; Miyake, H.; Mizuk, R.; Mohanty, G.  b.; Mondal, S.; Moneta, S.; Moreira De Carvalho, A.  l.; Moser, H. -G.; Nakamura, I.; Nakamura, K.  r.; Nakao, M.; Nakazawa, Y.; Naruki, M.; Natkaniec, Z.; Natochii, A.; Nayak, M.; Nazaryan, G.; Neu, M.; Nishida, S.; Novosel, A.; Ogawa, S.; Okubo, R.; Ono, H.; Onuki, Y.; Otani, F.; Pakhlova, G.; Paoloni, E.; Pardi, S.; Parham, K.; Park, H.; Park, J.; Park, K.; Park, S. -H.; Paschen, B.; Passeri, A.; Patra, S.; Pedlar, T.  k.; Peruzzi, I.; Peschke, R.; Pestotnik, R.; Piccolo, M.; Piilonen, L.  e.; Podesta-Lerma, P.  l.  m.; Podobnik, T.; Pokharel, S.; Prakash, A.; Praz, C.; Prell, S.; Prencipe, E.; Prim, M.  t.; Privalov, S.; Prudiiev, I.; Purwar, H.; Rados, P.; Raeuber, G.; Raiz, S.; Raj, V.; Rauls, N.; Ravindran, K.; Rehman, J.  u.; Reif, M.; Reiter, S.; Remnev, M.; Reuter, L.; Ricalde Herrmann, D.; Ripp-Baudot, I.; Rizzo, G.; Robertson, S.  h.; Roehrken, M.; Roney, J.  m.; Rostomyan, A.; Rout, N.; Salutari, L.; Sanders, D.  a.; Sandilya, S.; Santelj, L.; Santos, C.; Savinov, V.; Scavino, B.; Schmitt, C.; Schmitz, J.; Schneider, S.; Schwanda, C.; Schwartz, A.  j.; Seino, Y.; Selce, A.; Senyo, K.; Serrano, J.; Sevior, M.  e.; Sfienti, C.; Shan, W.; Sharma, C.; Sharma, G.; Shi, X.  d.; Shillington, T.; Shimasaki, T.; Shiu, J. -G.; Shtol, D.; Sibidanov, A.; Simon, F.; Singh, J.  b.; Skorupa, J.; Sobie, R.  j.; Sobotzik, M.; Soffer, A.; Sokolov, A.; Solovieva, E.; Song, W.; Spataro, S.; Spruck, B.; 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.; Uglov, T.; Unger, K.; Unno, Y.; Uno, K.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Vahsen, S.  e.; Van Tonder, R.; Varvell, K.  e.; Veronesi, M.; Vinokurova, A.; Vismaya, V.  s.; Vitale, L.; Vobbilisetti, V.; Volpe, R.; Vossen, A.; Wakai, M.; Wallner, S.; Wang, M. -Z.; Wang, X.  l.; Wang, Z.; Warburton, A.; Watanabe, M.; Watanuki, S.; Wessel, C.; Won, E.; X.  p., Xu; Yabsley, B.  d.; Yamada, S.; Yan, W.; Yan, W.  c.; Yelton, J.; Yin, J.  h.; Yoshihara, K.; Yuan, C.  z.; Yuan, J.; Zani, L.; Zeng, F.; Zeyrek, M.; Zhang, B.; Zhou, J.  s.; Zhou, Q.  d.; Zhu, L.; Zhukova, V.  i.; Žlebčík, R.

doi:10.1103/fmn3-h8fy

We report measurements of the ratios of branching fractions (Formula presented), where (Formula presented) denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365 fb−1 data sample collected with the Belle II detector at the SuperKEKB eþe− collider, which operates at a center-of-mass energy corresponding to the (Formula presented) resonance, just above the threshold for BB̄ production. Signal candidates are reconstructed by selecting events in which the companion B meson from the (Formula presented) decay is identified in semileptonic modes. The τ lepton is reconstructed via its leptonic decays. We obtain (Formula presented) and (Formula presented), which are consistent with world average values. Accounting for the correlation between them, these values differ from the Standard Model expectation by a collective significance of 1.7 standard deviations.

Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2025). Test of lepton flavor universality with measurements of R(D+) and R(D*+) using semileptonic B tagging at the Belle II experiment. PHYSICAL REVIEW D, 112(3), 032010-1-032010-23 [10.1103/fmn3-h8fy].

Test of lepton flavor universality with measurements of R(D+) and R(D*+) using semileptonic B tagging at the Belle II experiment

Adachi, I.;Adamczyk, K.;Aggarwal, L.;Ahmed, H.;Aihara, H.;Akopov, N.;Alghamdi, S.;Alhakami, M.;Aloisio, A.;Althubiti, N.;Amos, K.;Angelsmark, M.;Anh Ky, N.;Antonioli, C.;Asner, D. M.;Atmacan, H.;Aushev, T.;Aushev, V.;Aversano, M.;Ayad, R.;Babu, V.;Bae, H.;Baghel, N. K.;Bahinipati, S.;Bambade, P.;Banerjee, Sw.;Bansal, S.;Barrett, M.;Bartl, M.;Baudot, J.;Beaubien, A.;Becherer, F.;Becker, J.;Bennett, J. V.;Bernlochner, F. U.;Bertacchi, V.;Bertemes, M.;Bertholet, E.;Bessner, M.;Bettarini, S.;Bhardwaj, V.;Bhuyan, B.;Bianchi, F.;Bilka, T.;Biswas, D.;Bobrov, A.;Bodrov, D.;Bolz, A.;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.;Cheon, B. G.;Chilikin, K.;Chin, J.;Chirapatpimol, K.;Cho, H. -E.;Cho, K.;Cho, S. -J.;Choi, S. -K.;Choudhury, S.;Cochran, J.;Consigny, I.;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.;Dey, S.;Dhamija, R.;Di Capua, F.;Dingfelder, J.;Doležal, Z.;Domínguez Jiménez, I.;Dong, T. V.;Dorigo, M.;Dossett, D.;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.;Gale, A.;Ganiev, E.;Garcia-Hernandez, M.;Garg, R.;Gaudino, G.;Gaur, V.;Gautam, V.;Gaz, A.;Gellrich, A.;Ghevondyan, G.;Ghosh, D.;Ghumaryan, H.;Giakoustidis, G.;Giordano, R.;Giri, A.;Gironella Gironell, P.;Glazov, A.;Gobbo, B.;Godang, R.;Gogota, O.;Goldenzweig, P.;Gradl, W.;Granderath, S.;Graziani, E.;Greenwald, D.;Gruberová, Z.;Guan, Y.;Gudkova, K.;Haide, I.;Han, Y.;Hara, K.;Hara, T.;Harris, C.;Hayasaka, K.;Hayashii, H.;Hazra, S.;Hearty, C.;Hedges, M. T.;Heredia de la Cruz, I.;Hernández Villanueva, M.;Higuchi, T.;Hoek, M.;Hohmann, M.;Hoppe, R.;Horak, P.;Hsu, C. -L.;Huang, A.;Humair, T.;Iijima, T.;Inami, K.;Inguglia, G.;Ipsita, N.;Ishikawa, A.;Itoh, R.;Iwasaki, M.;Jackson, P.;Jacobi, D.;Jacobs, W. W.;Jaffe, D. E.;Jang, E. -J.;Ji, Q. P.;Jia, S.;Jin, Y.;Johnson, A.;Joo, K. K.;Junkerkalefeld, H.;Kaliyar, A. B.;Kandra, J.;Kang, K. H.;Kang, S.;Karyan, G.;Kawasaki, T.;Keil, F.;Ketter, C.;Khan, M.;Kiesling, C.;Kim, C. -H.;Kim, D. Y.;Kim, J. -Y.;Kim, K. -H.;Kim, Y. -K.;Kindo, H.;Kinoshita, K.;Kodyš, P.;Koga, T.;Kohani, S.;Kojima, K.;Korobov, A.;Korpar, S.;Kowalewski, R.;Križan, P.;Krokovny, P.;Kuhr, T.;Kulii, Y.;Kumar, D.;Kumar, J.;Kumara, K.;Kunigo, T.;Kuzmin, A.;Kwon, Y. -J.;Lacaprara, S.;Lai, Y. -T.;Lalwani, K.;Lam, T.;Lange, J. S.;Lau, T. S.;Laurenza, M.^{Membro del Collaboration Group};Leboucher, R.;Le Diberder, F. R.;Lee, M. J.;Lemettais, C.;Leo, P.;Lewis, P. M.;Li, C.;Li, H. -J.;Li, L. K.;Li, Q. M.;Li, W. Z.;Li, Y. B.;Liao, Y. P.;Libby, J.;Lin, J.;Lin, S.;Liu, M. H.;Liu, Q. Y.;Liu, Y.;Liu, Z. Q.;Liventsev, D.;Longo, S.;Lueck, T.;Lyu, C.;Ma, Y.;Madaan, C.;Maggiora, M.;Maharana, S. P.;Maiti, R.;Mancinelli, G.;Manoni, E.;Manthei, A. C.;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.;Matvienko, D.;Maurya, S. K.;Maushart, M.;McKenna, J. A.;Mehta, R.;Meier, F.;Meleshko, D.;Merola, M.;Metzner, F.;Miller, C.;Mirra, M.;Mitra, S.;Miyabayashi, K.;Miyake, H.;Mizuk, R.;Mohanty, G. B.;Mondal, S.;Moneta, S.;Moreira de Carvalho, A. L.;Moser, H. -G.;Nakamura, I.;Nakamura, K. R.;Nakao, M.;Nakazawa, Y.;Naruki, M.;Natkaniec, Z.;Natochii, A.;Nayak, M.;Nazaryan, G.;Neu, M.;Nishida, S.;Novosel, A.;Ogawa, S.;Okubo, R.;Ono, H.;Onuki, Y.;Otani, F.;Pakhlova, G.;Paoloni, E.;Pardi, S.;Parham, K.;Park, H.;Park, J.;Park, K.;Park, S. -H.;Paschen, B.;Passeri, A.;Patra, S.;Pedlar, T. K.;Peruzzi, I.;Peschke, R.;Pestotnik, R.;Piccolo, M.;Piilonen, L. E.;Podesta-Lerma, P. L. M.;Podobnik, T.;Pokharel, S.;Prakash, A.;Praz, C.;Prell, S.;Prencipe, E.;Prim, M. T.;Privalov, S.;Prudiiev, I.;Purwar, H.;Rados, P.;Raeuber, G.;Raiz, S.;Raj, V.;Rauls, N.;Ravindran, K.;Rehman, J. U.;Reif, M.;Reiter, S.;Remnev, M.;Reuter, L.;Ricalde Herrmann, D.;Ripp-Baudot, I.;Rizzo, G.;Robertson, S. H.;Roehrken, M.;Roney, J. M.;Rostomyan, A.;Rout, N.;Salutari, L.^{Membro del Collaboration Group};Sanders, D. A.;Sandilya, S.;Santelj, L.;Santos, C.;Savinov, V.;Scavino, B.;Schmitt, C.;Schmitz, J.;Schneider, S.;Schwanda, C.;Schwartz, A. J.;Seino, Y.;Selce, A.;Senyo, K.;Serrano, J.;Sevior, M. E.;Sfienti, C.;Shan, W.;Sharma, C.;Sharma, G.;Shi, X. D.;Shillington, T.;Shimasaki, T.;Shiu, J. -G.;Shtol, D.;Sibidanov, A.;Simon, F.;Singh, J. B.;Skorupa, J.;Sobie, R. J.;Sobotzik, M.;Soffer, A.;Sokolov, A.;Solovieva, E.;Song, W.;Spataro, S.;Spruck, B.;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.;Uglov, T.;Unger, K.;Unno, Y.;Uno, K.;Uno, S.;Urquijo, P.;Ushiroda, Y.;Vahsen, S. E.;van Tonder, R.;Varvell, K. E.;Veronesi, M.;Vinokurova, A.;Vismaya, V. S.;Vitale, L.;Vobbilisetti, V.;Volpe, R.;Vossen, A.;Wakai, M.;Wallner, S.;Wang, M. -Z.;Wang, X. L.;Wang, Z.;Warburton, A.;Watanabe, M.;Watanuki, S.;Wessel, C.;Won, E.;Xu, X. P.;Yabsley, B. D.;Yamada, S.;Yan, W.;Yan, W. C.;Yelton, J.;Yin, J. H.;Yoshihara, K.;Yuan, C. Z.;Yuan, J.;Zani, L.;Zeng, F.;Zeyrek, M.;Zhang, B.;Zhou, J. S.;Zhou, Q. D.;Zhu, L.;Zhukova, V. I.;Žlebčík, R.

2025-01-01

Abstract

We report measurements of the ratios of branching fractions (Formula presented), where (Formula presented) denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365 fb−1 data sample collected with the Belle II detector at the SuperKEKB eþe− collider, which operates at a center-of-mass energy corresponding to the (Formula presented) resonance, just above the threshold for BB̄ production. Signal candidates are reconstructed by selecting events in which the companion B meson from the (Formula presented) decay is identified in semileptonic modes. The τ lepton is reconstructed via its leptonic decays. We obtain (Formula presented) and (Formula presented), which are consistent with world average values. Accounting for the correlation between them, these values differ from the Standard Model expectation by a collective significance of 1.7 standard deviations.

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				2025
			
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				Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2025). Test of lepton flavor universality with measurements of 
R(D+)
 and 
R(D*+)
 using semileptonic 
B
 tagging at the Belle II experiment. PHYSICAL REVIEW D, 112(3), 032010-1-032010-23 [10.1103/fmn3-h8fy].
			
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/528978

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Test of lepton flavor universality with measurements of R(D+) and R(D*+) using semileptonic B tagging at the Belle II experiment

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Test of lepton flavor universality with measurements of R(D+) and R(D*+) using semileptonic B tagging at the Belle II experiment

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