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  4. Observation Of The Dalitz Decay Of The First Excited State Of The Charmed-Strange Meson

Observation Of The Dalitz Decay Of The First Excited State Of The Charmed-Strange Meson

File(s)
sd259.pdf (3.65 MB)
Permanent Link(s)
https://hdl.handle.net/1813/33477
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Cornell Theses and Dissertations
Author
Das, Souvik
Abstract

The branching fraction for a previously unobserved decay D*+ [RIGHTWARDS ARROW] D+ e+ e[-] is pres s dicted theoretically in this dissertation to be 0.65% of the branching fraction for the decay D*+ [RIGHTWARDS ARROW] D+ [gamma]. We conduct a search for the D*+ [RIGHTWARDS ARROW] D+ e+ e[-] in 586 pb[-]1 s s s s of e+ e[-] collision data collected with the CLEO-c detector at the Cornell Electron Storage Ring (CESR) operating at a center of mass energy of 4170 MeV and observe it with a significance of 6.4 [sigma] over estimated backgrounds. The ratio of branching fractions B(D*+ [RIGHTWARDS ARROW] D+ e+ e[-] )/ B(D*+ [RIGHTWARDS ARROW] D+ [gamma]) is measured to be s s s s (0.72 ± 0.14(stat) ± 0.06(syst))%, which is within one standard deviation of uncertainty from the predicted value.

Date Issued
2011-01-31
Keywords
Ds charm strange meson Dalitz
•
Cornell CLEO
•
Souvik Das Anders Ryd
Committee Chair
Ryd, Anders
Committee Member
Perelstein, Maxim
Thom, Julia
Degree Discipline
Physics
Degree Name
Ph. D., Physics
Degree Level
Doctor of Philosophy
Type
dissertation or thesis

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