Title page for ETD etd-070699-205010


Type of Document Dissertation
Author Lai, I Chung
Author's Email Address iclai@lns62.lns.cornell.edu
URN etd-070699-205010
Title Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Kinoshita, Kay Committee Co-Chair
Piilonen, Leo E. Committee Co-Chair
Chang, Lay Nam Committee Member
Heflin, James R. Committee Member
Pitt, Mark L. Committee Member
Keywords
  • Mixing
  • Semileptonic Decay
  • B Meson
Date of Defense 1999-06-18
Availability restricted
Abstract
Using data recorded by the CLEO II detector operating at the

Upsilon(4S) resonance at the Cornell Electron Storage Ring,

several properties of B mesons are measured using a partially

reconstructed tag of the decay mode bar{B0} ->

D*+ l- bar{nu}. Using 2.38 fb**{-1} of on-resonance

data and the averaged B meson semileptonic branching fraction

through inclusive lepton momentum spectrum obtained by previous

CLEO analysis, we measure the B0 and B- semileptonic

branching fraction to be (10.78 +/- 0.60 +/- 0.69)% and

(10.25 +/- 0.57 +/- 0.65)% respectively, which yields the

lifetime ratio tau_+/tau_0 = 0.950 +0.117-0.080 +0.091-0.068,

assuming the equality of semileptonic partial branching width for

bar{B0} and B-. With a larger dataset of 3.1 fb**{-1}, we measured

the B0-bar{B0} mixing parameter chi_d to be 0.189 +/- 0.019 +/- 0.006.

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[VT] lai-appendix.pdf 113.99 Kb 00:00:31 00:00:16 00:00:14 00:00:07 < 00:00:01
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