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 .
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    thesis_v7.pdf 8.20 Mb 00:37:58 00:19:31 00:17:05 00:08:32 00:00:43

If you have questions or technical problems, please Contact DLA.