Title

Absolute branching fraction measurements for exclusives Ds semileptonic decays

Date of Award

2008

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Advisor(s)

Marina Artuso

Keywords

Branching fraction, Semileptonic decays, Cabibbo, Meson

Subject Categories

Physical Sciences and Mathematics | Physics

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.

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