Observation of b → dγ decays and determination of |Vtd/Vts|

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dc.contributor.authorMohapatra, Debabrataen
dc.contributor.committeechairPiilonen, Leo E.en
dc.contributor.committeememberFicenec, John R.en
dc.contributor.committeememberPitt, Mark L.en
dc.contributor.committeememberSimonetti, John H.en
dc.contributor.committeememberMizutani, Tetsuroen
dc.contributor.departmentPhysicsen
dc.date.accessioned2014-03-14T20:13:31Zen
dc.date.adate2006-08-15en
dc.date.available2014-03-14T20:13:31Zen
dc.date.issued2006-06-19en
dc.date.rdate2006-08-15en
dc.date.sdate2006-06-26en
dc.description.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, B̅⁰ → ρ⁰γ and B̅⁰ → ωγ as follows: B(B⁻ → ρ⁻γ) = 0.55 <sub>−0.36</sub><sup>+0.42</sup><sub>−0.08</sub><sup>+0.09</sup> B(B̅⁰ → ρ⁰γ) = 1.25 <sub>−0.33</sub><sup>+0.37</sup><sub>−0.06</sub><sup>+0.07</sup> B(B̅⁰ → ωγ) = 0.56 <sub>−0.27</sub><sup>+0.34</sup><sub>−0.10</sub><sup>+0.05</sup> 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(B̅ → (ρ,ω)γ) = 1.32 <sub>−0.31</sub><sup>+0.34</sup><sub>−0.09</sub><sup>0.10</sup>. This result is used to determine the ratio of CKM matrix elements, |V<sub>td</sub>/V<sub>ts</sub>| = 0.199 <sub>−0.025</sub><sup>+0.026</sup><sub>−0.015</sub><sup>0.018</sup>.en
dc.description.degreePh. D.en
dc.identifier.otheretd-06262006-145012en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06262006-145012/en
dc.identifier.urihttp://hdl.handle.net/10919/28129en
dc.publisherVirginia Techen
dc.relation.haspartthesis_v7.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCKM matrix elementsen
dc.subjectrare B decaysen
dc.subjectradiative B decaysen
dc.titleObservation of b → dγ decays and determination of |V<sub>td</sub>/V<sub>ts</sub>|en
dc.typeDissertationen
thesis.degree.disciplinePhysicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en
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