000000793 001__ 793
000000793 005__ 20180313161905.0
000000793 037__ $$aBELLE2-CONF-PROC-2018-005
000000793 041__ $$aeng
000000793 100__ $$aMoritz Gelb
000000793 245__ $$aSearch for the rare decay B+ -> l nu gamma at Belle and Belle II
000000793 260__ $$a$$c2018-03-13
000000793 300__ $$a6
000000793 520__ $$aThe 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 $\mathrm{\Upsilon(4S)}$ 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.
000000793 8560_ $$fmoritz.gelb@desy.de
000000793 8564_ $$uhttps://docs.belle2.org/record/793/files/BELLE2-CONF-PROC-2018-005.pdf