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Measurement of Differential Branching Fractions of Inclusive {B to X_u \, ell^+\, ν_(ell)} Decays
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arxiv 2107.13855 v2 pith:KYN57VRY submitted 2021-07-29 hep-ex
Measurement of Differential Branching Fractions of Inclusive {B to X_u \, ell^+\, ν_(ell)} Decays
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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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