Details

Observation of b to d gamma and determination of |Vtd/Vts|

by Mohapatra, Debabrata

Abstract (Summary)
The flavor changing neutral current process b -> d? is a sensitive probe to the Standard Model of elementary particle physics. Using a sample of 386 Ã 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 ?> ???, B0 -> ?0? and B0 -> ?? as follows: B(B ?> ???) = 0.55 +0.42?0.36 +0.09?0.08 B(B0 -> ?0?) = 1.25 +0.37?0.33 +0.07?0.06 B(B0 -> ??) = 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 -> (?, ?)?) = 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 .
Bibliographical Information:

Advisor:John Ficenec; Mark Pitt; John Simonetti; Leo Piilonen; Tetsuro Mizutani

School:Virginia Polytechnic Institute and State University

School Location:USA - Virginia

Source Type:Master's Thesis

Keywords:physics

ISBN:

Date of Publication:08/15/2006

© 2009 OpenThesis.org. All Rights Reserved.