Title page for ETD etd-06262006-145012


Type of Document Dissertation
Author Mohapatra, Debabrata
Author's Email Address dmohapat@vt.edu
URN etd-06262006-145012
Title Observation of b to d gamma and determination of |Vtd/Vts|
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Piilonen, Leo E. Committee Chair
Ficenec, John R. Committee Member
Mizutani, Tetsuro Committee Member
Pitt, Mark L. Committee Member
Simonetti, John H. Committee Member
Keywords
  • CKM matrix elements
  • rare B decays
  • radiative B decays
Date of Defense 2006-06-19
Availability unrestricted
Abstract
The flavor changing neutral current process

b -> dγ is a sensitive probe to the Standard Model of elementary particle physics. Using a sample of

386 × 106 B meson pairs accumulated by the Belle detector at the KEKB e+e− collider, we measure the branching fractions for the exclusive modes

B −> ρ−γ, B0 -> ρ0γ and B0 -> ωγ as follows:

B(B −> ρ−γ) = 0.55 +0.42−0.36 +0.09−0.08

B(B0 -> ρ0γ) = 1.25 +0.37−0.33 +0.07−0.06

B(B0 -> ωγ) = 0.56 +0.34−0.27 +0.05−0.10

where the first error on each value is statistical and the second is systematic. Assuming that these three modes are related by isospin conservation

rules, we find the combined branching fraction

B(B -> (ρ, ω)γ) = 1.32 +0.34−0.31 +0.10−0.09 .

This result is used to determine the ratio of CKM matrix elements,

|Vtd/Vts| = 0.199 +0.026−0.025 +0.018−0.015 .

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