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  • Measurement of Differential Branching Fractions of Inclusive \({B \to X_u \, \ell^+\, \nu_{\ell}}\) Decays
    Cao, L; Adachi, I; Asner, D M; Bahinipati, S; Bilka, T; Biswal, J; Bobrov, A; Branchini, P; Browder, T E; Budano, A; Chang, P; Cheon, B G; Chilikin, K; Cho, H E; Choudhury, S; Cinabro, D; Dubey, S; Epifanov, D; Frey, A; Garg, R; Gabyshev, N; Giri, A; Goldenzweig, P; Halder, S; Hara, T; Hayasaka, K; M Hernandez Villanueva; W -S Hou; C -L Hsu; Inami, K; Itoh, R; Jin, Y; Kahn, J; Kang, K H; Kichimi, H; Kiesling, C; Kim, C H; Kim, D Y; Kim, S H; Y -K Kim; Kimmel, T D; Kinoshita, K; Konno, T; Korobov, A; Križan, P; Krokovny, P; Kulasiri, R; Kumara, K; Y -J Kwon; Li, L K; L Li Gioi; Libby, J; Lieret, K; Liventsev, D; MacQueen, C; Merola, M; Metzner, F; Mizuk, R; Mohanty, G B; Mohanty, S; Nakao, M; Natochii, A; Nisar, N K; Nishida, S; Ogawa, S; Onuki, Y; S -H Park; Patra, S; Paul, S; Röhrken, M; Rostomyan, A; Rozanska, M; Sahoo, D; Savinov, V; Schwanda, C; Seino, Y; Shapkin, M; J -G Shiu; Simon, F; Solovieva, E; Starič, M; Strube, J F; Sumihama, M; Tamponi, U; Tao, Y; Tenchini, F; Urquijo, P; Varner, G; Varvell, K E; Waheed, E; Wang, P; Wang, X L; Watanabe, M; Watanuki, S; Werbycka, O; Yabsley, B D; Yan, W; H Ye; Yin, J H; Zhilich, V

    arXiv.org, 12/2021
    Paper, Journal Article

    The first measurements of differential branching fractions of inclusive semileptonic \({B \to X_u \, \ell^+\, \nu_{\ell}}\) decays are performed using the full Belle data set of 711 fb\(^{-1}\) of integrated luminosity at the \(\Upsilon(4S)\) resonance and for \(\ell = e, \mu\). Differential branching fractions are reported as a function of the lepton momentum, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic \({B \to X_c \, \ell^+\, \nu_{\ell}}\) decays and other processes, and corrected for resolution and acceptance effects. The measured distributions are compared to predictions from inclusive and hybrid \({B \to X_u \, \ell^+\, \nu_{\ell}}\) calculations.

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