Measurements of the Ratios ${\cal B}(D_s^+\to η\ell^+ν)/{\cal B}(D_s^+\to ϕ\ell^+ν)$ and ${\cal B}(D_s^+\to η'\ell^+ν)/{\cal B}(D

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202307Using the CLEO~II detector we measure ${\cal B}(D_s^+\to ηe^+ν)/{\cal B}(D_s^+\to ϕe^+ν) =1.24\pm0.12\pm0.15$, ${\cal B}(D_s^+\to η' e^+ν)/{\cal B}(D_s^+\to ϕe^+ν) =0.43\pm0.11\pm0.07$ and ${\cal B}(D_s^+\to η' e^+ν)/{\cal B}(D_s^+\to ηe^+ν) =0.35\pm0.09\pm0.07$. We find the vector to pseudoscalar ratio, ${\cal B}(D_s^+\to ϕe^+ν)/{\cal B}(D_s^+\to (η+η') e^+ν) =0.60\pm0.06\pm0.06$, which is similar to the ratio found in non strange $D$ decays.11 page uuencoded postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNSHigh Energy Physics - ExperimentMeasurements of the Ratios ${\cal B}(D_s^+\to η\ell^+ν)/{\cal B}(D_s^+\to ϕ\ell^+ν)$ and ${\cal B}(D_s^+\to η'\ell^+ν)/{\cal B}(D_s^+\to ϕ\ell^+ν)$text