Use this URL to cite or link to this record in EThOS:
Title: Determination of |Vub| using the lepton energy spectrum in events tagged with a fully reconstructed B meson
Author: Sigamani, Michael
ISNI:       0000 0004 2678 8254
Awarding Body: Queen Mary, University of London
Current Institution: Queen Mary, University of London
Date of Award: 2009
Availability of Full Text:
Access from EThOS:
Access from Institution:
We 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.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Physics