Absolute branching fraction measurements for exclusives Ds semileptonic decays

Koloina A. Randrianarivony, Syracuse University

ISBN 9781109450583

Abstract

We measure the absolute branching fractions of D s semileptonic decays where the hadron in the final state is one of [straight phi], η, η', [Special characters omitted.] , K *0 , and f 0 , using 2.8 × 10 5 e + e - [arrow right] D s [Special characters omitted.] decays collected in the CLEO-c detector at a center-of-mass energy close to 4170 MeV. We obtain [Special characters omitted.] ([Special characters omitted.] [arrow right] [straight phi] e + ν e ) = (2.29 ± 0.37 ± 0.11)%, [Special characters omitted.] ([Special characters omitted.] [arrow right] η e + ν e ) = (2.48 ± 0.29 ± 0.13)%, [Special characters omitted.] ([Special characters omitted.] [arrow right] η' e + ν e ) = (0.91 ± 0.33 ± 0.05)%, where the first uncertainties are statistical and the second are systematic. We also obtain [Special characters omitted.] ([Special characters omitted.] [arrow right] K 0 e + ν e ) = (0.37 ± 0.10 ± 0.02)%, and [Special characters omitted.] ([Special characters omitted.] [arrow right] K *0 e + ν e ) = (0.18 ± 0.07 ± 0.01)%, which are the first measurements of Cabibbo suppressed exclusive D s semileptonic decays, and, [Special characters omitted.] ([Special characters omitted.] [arrow right] f 0 e + ν e ) × [Special characters omitted.] ( f 0 [arrow right] π + π - ) = (0.13 ± 0.04 ± 0.01)%. This is the first direct evidence of a semileptonic decay including a scalar meson in the final state.