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Measurement of the decays <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>η</mml:mi><mml:mo>ℓ</mml:mo><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo>ℓ</mml:mo></mml:mrow></mml:msub></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo…
We report branching fraction measurements of the decays ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ and ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ based on $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected near the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with the Belle experiment at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. This data sample contains 772 million $B\overline{B}$ events. One of the two $B$ mesons is fully reconstructed …