Determinations of |V_{ub}| from Inclusive Semileptonic B Decays with Reduced Model Dependence

Technical Report · Mon Feb 06 04:00:00 EST 2006

DOI:https://doi.org/10.2172/876044· OSTI ID:876044

Aubert, B.

We report two novel determinations of |V{sub ub}| with reduced model dependence, based on measurements of the mass distribution of the hadronic system in semileptonic B decays. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson from {Upsilon}(4S) {yields} (B{bar B}) events. In one approach, we combine the inclusive {bar B} {yields} X{sub u}{ell}{bar {nu}} rate with a measurement of the inclusive B {yields} X{sub s}{gamma} photon energy spectrum. We obtain |V{sub ub}| = (4.43 {+-} 0.38{sub stat} {+-} 0.25{sub syst} {+-} 0.29{sub theo}) x 10{sup -3}. In another approach we measure the total {bar B} {yields} X{sub u} {ell}{bar {nu}} rate over the full phase space and find |V{sub ub}| = (3.84 {+-} 0.70{sub stat} {+-} 0.30{sub syst} {+-} 0.10{sub theo}) x 10{sup -3}.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 876044
• Report Number(s): SLAC-PUB-11582; hep-ex/0601046
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
DECAY
Experiment-HEP
HEPEX
LEPTONS
MASS DISTRIBUTION
PHASE SPACE
PHOTONS