Determinations of vertical bar V{sub ub} vertical bar from Inclusive Semileptonic B Decays with Reduced Model Dependence

Journal Article · Fri Jun 09 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.221801· OSTI ID:20777269

Aubert, B; Barate, R; Boutigny, D; Couderc, F; Karyotakis, Y; Lees, J P; Poireau, V; Tisserand, V; Zghiche, A ^[1]; Grauges, E ^[2]; Palano, A; Pappagallo, M; Pompili, A ^[3]; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S ^[4]; Eigen, G; Ofte, I ^[5]

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1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
2. IFAE, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona (Spain)
3. Dipartimento di Fisica and INFN, Universita di Bari, I-70126 Bari (Italy)
4. Institute of High Energy Physics, Beijing 100039 (China)
5. Institute of Physics, University of Bergen, N-5007 Bergen (Norway)

We report two novel determinations of vertical bar V{sub ub} vertical bar 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}BB events. In one approach, we combine the inclusive B{yields}X{sub u}l{nu} rate, integrated up to a maximum hadronic mass m{sub X}<1.67 GeV/c{sup 2}, with a measurement of the inclusive B{yields}X{sub s}{gamma} photon energy spectrum. We obtain vertical bar V{sub ub} vertical bar =(4.43{+-}0.38{sub stat}{+-}0.25{sub syst}{+-}0.29{sub theo})x10{sup -3}. In another approach we measure the total B{yields}X{sub u}l{nu} rate over the full phase space and find vertical bar V{sub ub} vertical bar=(3.84{+-}0.70{sub stat}{+-}0.30{sub syst}{+-}0.10{sub theo})x10{sup -3}.

• OSTI ID: 20777269
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 96; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
ENERGY SPECTRA
GEV RANGE 01-10
LEPTONS
MASS
MASS DISTRIBUTION
PHASE SPACE
PHOTONS
SEMILEPTONIC DECAY