Sumitted to PubDB: 2018-03-13

Category: Proceeding, Visibility: Public

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Authors	Moritz Gelb
Date	2018-03-13
Belle II Number	BELLE2-CONF-PROC-2018-005
Abstract	The Belle collaboration reported an upper limit on the partial branching fraction on the rare decay ${\mathrm{B}}^{+}\to {\ell }^{+}{\nu }_{\ell }\gamma$ using the full dataset recorded at the $\mathrm{{\rm Y}}(4\mathrm{S})$ resonance. The decay allows for the extraction of the first inverse momentum of the light-cone distribution amplitude, an important parameter for QCD factorization for non-leptonic $\mathrm{B}$ decays. We present a MC study applying an improved tagging algorithm developed for the Belle~II experiment. We observe an increase of signal reconstruction efficiency of a factor of three, improving the expected sensitivity to $3.8\sigma$. Further we give an outlook for the sensitivity measuring ${\mathrm{B}}^{+}\to {\ell }^{+}{\nu }_{\ell }\gamma$ with the Belle~II experiment.

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