Measurement of |V{sub ub}| from Inclusive Charmless Semileptonic B Decays

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.021801· OSTI ID:21386895

Urquijo, P; Barberio, E; Limosani, A; Sevior, M E; Taylor, G N; Wedd, R ^[1]; Adachi, I; Dalseno, J; Haba, J; Itoh, R; Katayama, N; Krokovny, P; Nakao, M; Nishida, S; Nozaki, T; Ozaki, H; Sakai, Y; Sumisawa, K; Trabelsi, K; Uehara, S ^[2]

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1. University of Melbourne, School of Physics, Victoria 3010 (Australia)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

We present the partial branching fraction for inclusive charmless semileptonic B decays and the corresponding value of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub ub}|, using a multivariate analysis method to access {approx}90% of the B->X{sub u}lnu phase space. This approach dramatically reduces the theoretical uncertainties from the b-quark mass and nonperturbative QCD compared to all previous inclusive measurements. The results are based on a sample of 657x10{sup 6} BB pairs collected with the Belle detector. We find that {Delta}B(B->X{sub u}l{nu};p{sub l}{sup *B}>1.0 GeV/c)=1.963x(1+-0.088{sub stat}+-0.081{sub syst})x10{sup -3}. Corresponding values of |V{sub ub}| are extracted using several theoretical calculations.

• OSTI ID: 21386895
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 104; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
BEAUTY PARTICLES
BRANCHING RATIO
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
KOBAYASHI-MASKAWA MATRIX
MATHEMATICAL SPACE
MATHEMATICS
MATRICES
MULTIVARIATE ANALYSIS
PARTICLE DECAY
PHASE SPACE
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SEMILEPTONIC DECAY
SPACE
STATISTICS
WEAK PARTICLE DECAY