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In events where the partner $B$ meson is fully reconstructed, we use fits to the lepton momentum spectra above $1.3\\,\\mathrm{GeV}/c$ to obtain $R(X_{e/\\mu}) = 1.007 \\pm 0.009~(\\mathrm{stat}) \\pm 0.019~(\\mathrm{syst})$, which is t","authors_text":"A. Aloisio, A. Baur, A. Beaubien, A. B. Kaliyar, A. Bozek, A. Budano, A. C. Manthei, A. Fodor, A. Frey, A. Gabrielli, A. Gaz, A. Gellrich, A. Giri, A. Glazov, A. Hershenhorn, A. Ishikawa, A. Korobov, A. Kuzmin, A. Martini, A. Narimani Charan, A. Natochii, A. Paladino, A. Panta, A. Passeri, A. Rostomyan, A. Sangal, A. Selce, A. Soffer, A. Sokolov, A. Vinokurova, A. Vossen, A. Warburton, B. Bhuyan, B. D. Yabsley, Belle II Collaboration: L. Aggarwal, B. G. Cheon, B. G. Fulsom, B. Gobbo, B. Paschen, B. Scavino, B. Spruck, C. Cecchi, C. Hearty, C.-H. Kim, C. Kiesling, C.-L. Hsu, C. Lyu, C. Marinas, C. Martellini, C. Miller, C. Praz, C. P. Shen, C. Schwanda, C. Sfienti, C. Sharma, C. Wessel, D. A. Sanders, D. Biswas, D. Bodrov, D. Dossett, D. Ferlewicz, D. Levit, D. Liventsev, D. M. Asner, D. Matvienko, D. Narwal, D. Tonelli, D. Y. Kim, E. Bernieri, E. Bertholet, E. C. Hill, E. De La Cruz-Burelo, E. Ganiev, E. Graziani, E.-J. Jang, E. Kovalenko, E. Manoni, E. Prencipe, E. Solovieva, E. Torassa, E. Wang, E. Won, F. Bianchi, F. Dattola, F. Di Capua, F. Forti, F. Meier, F. Metzner, F. R. Le Diberder, F. Simon, F. Tenchini, F. U. Bernlochner, G. B. Mohanty, G. Casarosa, G. De Nardo, G. De Pietro, G. Dujany, G. Finocchiaro, G. Gaudino, G. Ghevondyan, G. Inguglia, G. Karyan, G. Nazaryan, G. Pakhlova, G. Pinna Angioni, G. Raeuber, G. Rizzo, G. S. Varner, H. Ahmed, H. Aihara, H. Atmacan, H. Bae, H.-E. Cho, H. Hayashii, H. Junkerkalefeld, H. Kindo, H. Ono, H. Park, H. Purwar, H. Svidras, H. Ye, I. Heredia de la Cruz, I. Nakamura, I. Peruzzi, I. Ripp-Baudot, I. Tsaklidis, I. Ueda, J. A. McKenna, J. Baudot, J. Becker, J. Borah, J. B. Singh, J. Cerasoli, J. Cochran, J. Dingfelder, J.-G. Shiu, J. H. Yin, J. Kumar, J. Libby, J. M. Roney, J. Park, J. Skorupa, J. S. Lange, J. V. Bennett, K. Chilikin, K. Chirapatpimol, K. Cho, K. E. Varvell, K. Gudkova, K. Hayasaka, K.-H. Kim, K. Inami, K. Kinoshita, K. Kojima, K. Kumara, K. Matsuoka, K. Miyabayashi, K. R. Nakamura, K. Senyo, K. Tanida, K. Trabelsi, K. Unger, K. Uno, K. Yoshihara, L. B. Rizzuto, L. Cao, L. Corona, L. E. Piilonen, L. K. Li, L. Martel, L. Massaccesi, L. Nayak, L. Polat, L. Santelj, L. Vitale, M. Barrett, M. Bauer, M. Bertemes, M. Bessner, M. Bra\\v{c}ko, M. Campajola, M.-C. Chang, M. Destefanis, M. Dorigo, M. Eliachevitch, M. E. Sevior, M. Garcia-Hernandez, M. Hern\\'andez Villanueva, M. Hohmann, M. Iwasaki, M. Kaleta, M. Laurenza, M. Maggiora, M. Mantovano, M. Masuda, M. Merola, M. Milesi, M. Mrvar, M. Nakao, M. Naruki, M. Reif, M. Stari\\v{c}, M. Sumihama, M. Takizawa, M. T. Hedges, M. T. Prim, M. Watanabe, M. Welsch, M.-Z. Wang, N. Akopov, N. Anh Ky, N. Ipsita, N. K. Nisar, N. Rad, N. Rout, N. Taniguchi, P. Bambade, P. Cheema, P. Ecker, P. Feichtinger, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. L. M. Podesta-Lerma, P. M. Lewis, P. Oskin, P. Pakhlov, P. Rados, P. Rocchetti, P. Urquijo, Q. D. Zhou, Q. P. Ji, Q. Y. Liu, R. A. Briere, R. Cheaib, R. de Sangro, R. Dhamija, R. Giordano, R. Godang, R. Itoh, R. J. Sobie, R. Kowalewski, R. Kumar, R. Leboucher, R. Maiti, R. Manfredi, R. Mizuk, R. Mussa, R. Peschke, R. Pestotnik, R. Stroili, R. Tiwary, R. van Tonder, R. \\v{Z}leb\\v{c}\\'ik, S. A. De La Motte, S. Bahinipati, S. Bansal, S. Bettarini, S. Bilokin, S. Bussino, S. B. Yang, S. Choudhury, S. Cunliffe, S. Dreyer, S. Dubey, S. E. Vahsen, S. Granderath, S. Halder, S. Hazra, S. Ito, S.-J. Cho, S. Jia, S.-K. Choi, S. K. Maurya, S. Kohani, S. Korpar, S. Lacaprara, S. Longo, S. Maity, S. Moneta, S. Nishida, S. Pardi, S. Patra, S. Paul, S. P. Maharana, S. Pokharel, S. Prell, S. Reiter, S. Sandilya, S. Spataro, S. Stefkova, S. Uno, S. Wallner, S. Watanuki, Sw. Banerjee, S. Yamada, S. Y. Suzuki, T. Aushev, T. Bilka, T. E. Browder, T. Ferber, T. Fillinger, T. Grammatico, T. Gu, T. Hara, T. Higuchi, T. Iijima, T. Kawasaki, T. K. Pedlar, T. Lueck, T. Podobnik, T. Shillington, T. Uglov, T. V. Dong, U. Tamponi, V. Aushev, V. Bertacchi, V. Bhardwaj, V. Chekelian, V. Gaur, V. I. Zhukova, V. S. Vismaya, V. Zhilich, W. Gradl, W. Shan, W. Sutcliffe, W. W. Jacobs, W. Yan, X. L. Wang, X. P. Xu, X. Y. Zhou, Y. Jin, Y.-J. Kwon, Y.-K. Kim, Y. Ma, Y. M. Yook, Y. Nakazawa, Y. Onuki, Y. Sato, Y. Seino, Y. Sue, Y. Uematsu, Y. Unno, Y. Ushiroda, Y. Zhai, Y. Zhang, Z. Dole\\v{z}al, Z. Gruberov\\'a, Z. Liptak, Z. Q. 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