Type of Document Dissertation Author Mohapatra, Debabrata Author's Email Address email@example.com 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 AbstractThe 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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