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dc.contributor.authorSigamani, Michael
dc.date.accessioned2011-02-09T11:46:35Z
dc.date.available2011-02-09T11:46:35Z
dc.date.issued2009
dc.identifier.urihttps://qmro.qmul.ac.uk/xmlui/handle/123456789/585
dc.descriptionPhDen_US
dc.description.abstractWe present measurements of partial branching fractions for the inclusive semileptonic decay of B ! Xu` (` = e or ) leading to the determination of the CKM matrix element jVubj. This analysis is based on a sample of 460 million BB events recorded at the (4S) resonance at the BABAR detector. We select B ! Xu` events using the energy spectrum of the lepton (E`) in an event where one of the B-mesons is fully reconstructed. We measure partial branching fractions in restricted regions of the E` spectrum, which are translated into values of jVubj using four theoretical approaches. We calculate the arithmetic mean, using the results from the four theoretical approaches at E` > 1:5 GeV resulting in: jVubj = (4:68+0:31 􀀀0:32) 10􀀀3. The analysis presented in this thesis is the rst time a measurement of jVubj has been performed using the E` spectrum in events tagged with a fully reconstructed B meson.en_US
dc.language.isoenen_US
dc.subjectPhysicsen_US
dc.titleDetermination of |Vub| using the lepton energy spectrum in events tagged with a fully reconstructed B mesonen_US
dc.typeThesisen_US
dc.rights.holderThe copyright of this thesis rests with the author and no quotation from it or information derived from it may be published without the prior written consent of the author


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    Theses Awarded by Queen Mary University of London

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