2020HAL AMUOpen access

Measurement of the semileptonic $\bar{B}^0 \to D^{*+} \ell^{-} \nu_{\ell}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb$^{-1}$of Belle II data

Belle II Collaboration, F. Abudinén, I Adachi, R. Adak, K. Adamczyk, P. Ahlburg, J. K. Ahn, Н. Акопов, N Akopov, A. Aloisio, F. Ameli, K. Amirie, L. Andricek, N Anh Ky, D. M. Asner, H Atmacan, V M Aulchenko, T. Aushev, V Aushev, T Aziz, V. Babu, S. Bacher, S. Baehr, S. Bahinipati, A. M. Bakich, P Bambade, S Banerjee, S. Bansal, M D Barrett, G. Batignani, J. Baudot, A. Beaulieu, J Becker, P. K. Behera, M Bender, J. V. Bennett, E. Bernieri, F. U. Bernlochner, M Bertemes, M Bessner, S. Bettarini, V Bhardwaj, B. Bhuyan, F Bianchi, T Bilka, S. Bilokin, D Biswas, A. Bobrov, A E Bondar, G Bonvicini, A. Bozek, M Bračko, P Branchini, N. Braun, R. A. Briere, T. E. Browder, Dane Brown, A Budano, L. Burmistrov, S Bussino, M Campajola, L Cao, G. Caria, G. Casarosa, C Cecchi, D. Cervenkov, M. -C. Chang, P Chang, R. Cheaib, V. Chekelian, Y. Q. Chen, Y. -T. Chen, B. G. Cheon, K Chilikin, K Chirapatpimol, S.-J. Cho, S.-K. Choi, S. Choudhury, S Choi, S. Choudhury, D. Cinabro, L. Corona, L. M. Cremaldi, D. Cuesta, S. Cunliffe, T. Czank, N. Dash, F. Dattola, E de la Cruz-Burelo, G de Nardo, M. De Nuccio, G de Pietro, R de Sangro, B. Deschamps, M. Destefanis, S. Dey, A. De Yta-Hernandez, A Di Canto, F. Di Capua, S. Di Carlo, J. Dingfelder, Z Doležal, I Ordás Jiménez, T Dong, K. Dort, D. Dossett, S. Dubey, S. Duell, G. Dujany, S I Eidelman, M. Eliachevitch, D. Epifanov, J. E. Fast, T Ferber, D. Ferlewicz, G. Finocchiaro, S Fiore, P. Fischer, A. Fodor, F. Forti, A. Frey, M Friedl, B. G. Fulsom, M. Gabriel, N. Gabyshev, E Ganiev, M. Garcia-Hernandez, R. Garg, A. Garmash, V Gaur, A. Gaz, U. Gebauer, M. Gelb, A Gellrich, J. Gemmler, T. Gessler, D. Getzkow, R Giordano, A. Giri, A. Glazov, B Gobbo, R Godang, P Goldenzweig, B. Golob, P. Gomis, P. Grace, W Gradl, E. Graziani, D Greenwald, Y Guan, C. Hadjivasiliou, S. Halder, K Hara, T. Hara, O. Hartbrich, T. Hauth, K Hayasaka, H Hayashii, C. Hearty, M. Heck, M. T. Hedges, I. Heredia de la Cruz, M. Hernandez Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, H. Hirata, M. Hoek, M Hohmann, S. Hollitt, T. Hotta, C. -L. Hsu, Y. Hu, K. Huang, T Iijima, K Inami, G. Inguglia, J. Irakkathil Jabbar, A Ishikawa, R Itoh, M. Iwasaki, Y. Iwasaki, S. Iwata, P Jackson, W W Jacobs, I. Jaegle, D. E. Jaffe, E. -J. Jang, M. Jeandron, H. B. Jeon, S Jia, Y. Jin, І. Каденко, K. K. Joo, I. Kadenko, J. Kahn, H. Kakuno, A. B. Kaliyar, J. Kandra, K Kang, P. Kapusta, R Haapala Karl, G Karyan, Y. Kato, H Kawai, T. Kawasaki, T. Keck, C. Ketter, H. Kichimi, C Kiesling, H.J. Kim, J.B. Kim, D. Y. Kim, K.-H. Kim, J. B. Kim, S.-H. Kim, Y.-K. Kim, S. -H. Kim, Y. -K. Kim, Y. Kim, T. D. Kimmel, H. Kindo, K Kinoshita, B. Kirby, C H Kleinwort, B. Knysh, P Kodyš, T Koga, S Kohani, I. Komarov, T. Konno, S. Korpar, N. Kovalchuk, T. M. G. Kraetzschmar, P Križan, R. Kroeger, J. F. Krohn, P Krokovny, H Krüger, W. Kuehn, T Kuhr, R. Kumar, K. Kumara, R. Kumar, K. Kumara, T. Kumita, T Kunigo, M. Kunzel, S. Kurz, A. Kuzmin, P. Kvasnicka, Y. Kwon, S. Lacaprara, Y. -T. Lai, C. La Licata, K. Lalwani, L. Lanceri, J. S. Lange, K. Lautenbach, P. J. Laycock, F. R. Le Diberder, I. -S. Lee, S. C. Lee, P. Leitl, D. Levit, P. M. Lewis, C. Li, L. K. Li, S. X. Li, J. Libby, K. Lieret, J Libby, K. Lieret, L. Li Gioi, J. Lin, Z Liptak, Q. Y. Liu, Z. A. Liu, D. Liventsev, S. Longo, A. Loos, T. Lueck, M. Lubej, T. Lueck, F. Luetticke, T. Luo, C. MacQueen, Y. Maeda, M Maggiora, S. Maity, R Manfredi, E Manoni, S Marcello, C. Marinas, A. Martini, M Masuda, T Matsuda, K. Matsuoka, D Matvienko, J. McNeil, F. Meggendorfer, J. C. Mei, F Meier, M Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, H Miyake, H. Miyata, R Mizuk, K. Azmi, G B Mohanty, H. Moon, T. Moon, J. A. Mora Grimaldo, A. Morda, T. Morii, H. -G. Moser, M. Mrvar, Th. Müller, F. J. Muller, Th. Muller, G. Muroyama, C. Murphy, R. Mussa, K. Nakagiri, I. Nakamura, K. R. Nakamura, E. Nakano, M Nakao, H. Nakayama, H. Nakazawa, T. Nanut, Z Natkaniec, A Natochii, M Akshatha Nayak, G. Nazaryan, D. Neverov, C. Niebuhr, M Niiyama, J. Ninkovic, N. K. Nisar, S Nishida, K. Nishimura, M. Nishimura, Nouxman M. H. A., B. Oberhof, K. Ogawa, S Ogawa, S. L. Olsen, Y. Onishchuk, H Ono, Y. Onuki, P. Oskin, E. R. Oxford, H. Ozaki, P. Pakhlov, G Pakhlova, A. Paladino, T. Pang, A. Panta, E. Paoloni, S. Pardi, S.-H. Park, H. Park, S. -H. Park, B. Paschen, A. Passeri, A. Pathak, S Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R Pestotnik, M Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, G. Polat, V. Popov, C Praz, E Prencipe, M. T. Prim, M. V. Purohit, N Rad, P Rados, R. Rasheed, M Reif, S Reiter, M. Remnev, P. K. Resmi, I. Ripp-Baudot, M. Ritter, M. Ritzert, G. Rizzo, L. B. Rizzuto, S Robertson, D. Pérez, J. M. Roney, C Rosenfeld, A Rostomyan, N Rout, M. Rozanska, G Russo, D. Sahoo, Y. Sakai, D Sanders, S Sandilya, A. Sangal, L Santelj, P. Sartori, J. Sasaki, Y. Sato, V Savinov, B Scavino, M. Schram, H. Schreeck, J. Schueler, C. Schwanda, A. J. Schwartz, B Schwenker, R. M. Seddon, Y Seino, A. Selce, K Senyo, I. S. Seong, J. Serrano, M. E. Sevior, C. Sfienti, V. Shebalin, C-K Shen, H. Shibuya, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, S. Skambraks, K. Smith, R J Sobie, A Soffer, A. Sokolov, Y. Soloviev, E Solovieva, S Spataro, B. Spruck, M Starič, S Stefkova, Z. S. Stottler, R Stroili, J. Strube, J. Stypula, M Sumihama, K. Sumisawa, T Sumiyoshi, D. J. Summers, W. Sutcliffe, K. Suzuki, S Suzuki, H. Svidras, M. Tabata, M. Takahashi, M Takizawa, U Tamponi, S Tanaka, K. Tanida, H. Tanigawa, N. Taniguchi, Y. Tao, P. Taras, F. Tenchini, D. Tonelli, E Torassa, K. Trabelsi, T. Tsuboyama, N. Tsuzuki, M Uchida, I Ueda, S. Uehara, T. Ueno, T. Uglov, K Unger, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, S. E. Vahsen, R van Tonder, G. S. Varner, K. E. Varvell, A. Vinokurova, L Vitale, V. Vorobyev, A. Vossen, E. Waheed, H. M. Wakeling, B. Wang, W. Wan Abdullah, M.-Z. Wang, C. H. Wang, M. -Z. Wang, X. L. Wang, A Warburton, M. Watanabe, S Watanuki, I. Watson, J M Webb, S. Wehle, M. Welsch, C Wessel, J. Wiechczynski, P. Wieduwilt, H. Windel, E. Won, L Wu, X. P. Xu, B. Yabsley, S. Yamada, W L Yan, S. B. Yang, In‐Sung Yeo, J Yelton, I. Yeo, J. H. Yin, M. Yonenaga, Y. M. Yook, T. Yoshinobu, W. L. Yuan, G. Yuan, W. Yuan, Y Yusa, L Zani, Z. Zhang, Y. Zhang, Z. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, V. Zhulanov, A. Zupanc

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Abstract

We present a first measurement of the $\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity of \lumi are analyzed, which were recorded by the Belle~II detector operated at the SuperKEKB accelerator complex. We measure$\cal{B}(\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}) =4.51 \pm 0.41_{stat}\pm0.27_{syst} \pm0.45_{\pi_s}$, with the first and second error denoting the statistical and systematic uncertainty, respectively, and the third dominant uncertainty is from the slow pion reconstruction efficiency.

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We present a first measurement of the $\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity of \lumi are analyzed, which were recorded by the Belle~II detector operated at the SuperKEKB accelerator complex. We measure$\cal{B}(\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}) =4.51 \pm 0.41_{stat}\pm0.27_{syst} \pm0.45_{\pi_s}$, with the first and second error denoting the statistical and systematic uncertainty, respectively, and the third dominant uncertainty is from the slow pion reconstruction efficiency.

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Available abstract

We present a first measurement of the $\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity of \lumi are analyzed, which were recorded by the Belle~II detector operated at the SuperKEKB accelerator complex. We measure$\cal{B}(\bar{B^{0}} \rightarrow D^{*+} \ell^{-} \nu_{\ell}) =4.51 \pm 0.41_{stat}\pm0.27_{syst} \pm0.45_{\pi_s}$, with the first and second error denoting the statistical and systematic uncertainty, respectively, and the third dominant uncertainty is from the slow pion reconstruction efficiency.

Key concepts: Physics, Branching fraction, Particle physics, Bar (unit), Meson, Pion, Luminosity, Nuclear physics

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Measurement of the semileptonic $\bar{B}^0 \to D^{*+} \ell^{-} \nu_{\ell}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb$^{-1}$of Belle II data — Research Paper | ScholarLens