Title

Branching fraction measurements and SU(3) diagrammatic analysis of Cabibbo-suppressed D meson decays

Date of Award

2007

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Keywords

D meson, Cabibbo-suppressed decays, Branching fraction, SU(3) singlet

Subject Categories

Physical Sciences and Mathematics | Physics

Abstract

Using 281 p b -1 of data collected using the CLEO-c detector, we present new measurements of Cabibbo-suppressed decays of D mesons. We report first observations and measurements of the following branching fractions: B ( D 0 [arrow right] η'π 0 ) = (8.1±1.5±0.6)×10 -4 , B ( D 0 [arrow right] ηη) = (16.5±1.4±1.1)×10 -4 , B ( D 0 [arrow right] ηη') = (12.5±2.5±1.1)×10 -4 , B ( D 0 [arrow right] ηπ + π - ) = (10.9±1.3±1.0)×10 -4 , B ( D 0 [arrow right] η'π + π - ) = (4.3±1.6±0.6)×10 -4 , B ( D + [arrow right] ηπ + π 0 )=(13.8±3.2±1.6)×10 -4 , B ( D + [arrow right] η'π + π 0 ) = (15.8±4.3±2.6)×10 -4 . The uncertainties are statistical and systematic, respectively. We also present improved measurements of the branching fractions: B ( D 0 [arrow right] ηπ 0 ) = (6.3±1.0±0.4)×10 -4 , B ( D + [arrow right] ηπ + ) = (34.3±1.4±1.7)×10 -4 , and B ( D + [arrow right] η'π + ) = (44.4±2.5±2.6)×10 -4 . Several other modes are not observed, and we set the following 90% confidence level upper limits: B ( D 0 [arrow right] ηπ 0 π 0 ) ≤ (11.0×10 -4 ), B ( D 0 [arrow right] ηηπ 0 ) ≤ (21.0×10 -4 ), B ( D 0 [arrow right] ηηη) ≤ (8.0×10 -4 ), B ( D + [arrow right] ηK + ) ≤ (0.9×10 -4 ), and B ( D + [arrow right] η'K + ) ≤ (1.1×10 -4 ). We have also performed an SU (3) topological analysis and find reasonable agreement in the Color-suppressed and Exchange diagram amplitudes between Cabibbo-favored and Cabibbo-suppressed decays. If we allow for an additional singlet Exchange amplitude that couples to the SU(3) singlet part of the η and η', we find two solutions. The small solution which is about two standard deviations from 0, is favored over the larger solution, due to OZI-suppression.

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