Study of flavor tagging with semi-exclusive reconstruction of b [right arrow] D(sigma)X decays
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69691095-MIT.pdf
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Author(s)
Ptacek, Elizabeth S. (Elizabeth Sara)
Advisor(s)
Gabriella Sciolla.
Date Issued
2005
Publisher
Massachusetts Institute of Technology
Abstract
The BaBar experiment measures CP violation in the B meson system by analyzing the decays of B⁰B̄⁰ pairs in which one of the mesons decays into a CP eigenstate. By measuring the decay time distribution separately for B⁰ and B̄⁰ decays the CP violating asymmetry and sin 2[beta] can be measured. In order to measure the decay time distribution for the B⁰ and B̄⁰ decays, it is necessary to identify the flavor, or tag, of the second B meson. The flavor of the B meson is identified by an algorithm which analyzes physical processes which carry flavor information from its decay. Analyzing new physical processes could potentially improve the efficiency of the tagging algorithm. I tested the effect of adding subtaggers which estimated the flavor of the tag B based on the flavor or the charge of its D⁰ or Ds daughters. However due to the low yields and high backgrounds of reconstructed D⁰ and Ds candidates, these subtaggers were not effective at making a net contribution to the tagging process.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.
In title on t.p., "[right arrow]" is a symbol and "(sigma)" is the lower case Greek letter, subscript.
Includes bibliographical references (p. 46-47).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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