Measurement of the branching fractions of the $B^+ \to \eta \ell^+ \nu_{\ell} $ and $B^+ \to \eta^{\prime} \ell^+ \nu_{\ell} $ decays with signal-side only reconstruction in the full $q^2$ range
U. Gebauer, C. Beleño, A. Frey, I. Adachi et autres
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DESY Publication Database (PUBDB) (Deutsches Elektronen-Synchrotron)