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Search for the rare decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mo>ℓ</mml:mo></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo>ℓ</mml:mo></mml:mrow></mml:msub><mml:mi>γ</mml:mi></mml:mrow></mml:math> with improved…
We present the result of the search for the rare $B$ meson decay of ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}\ensuremath{\gamma}$ with $\ensuremath{\ell}=\mathrm{e},\ensuremath{\mu}$. For the search the full data set recorded by the Belle experiment of $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity near the $\mathrm{\ensuremath{\Upsilon}}(4\mathrm{S})$ resonance is used. Signal candidates are reconstructed for photon energies ${E}_{\ensuremath{\gamma}}$ larger …