Measurement of $| V_{u b} |$ Using Inclusive $B \to X_{u} ℓ ν$ Decays with a Novel $X_{u}$ -Reconstruction Method

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10 March 2004

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 92 (10) , 101801
https://doi.org/10.1103/physrevlett.92.101801

Abstract

We report the measurement of an inclusive partial branching fraction for charmless semileptonic

B

decay and the extraction of

| V_{u b} |

. Candidates for

B \to X_{u} ℓ ν

are identified with a novel

X_{u}

reconstruction method based on neutrino reconstruction via missing 4-momentum and a technique called “simulated annealing.” Based on

86.9 {fb}^{- 1}

of data taken with the Belle detector, we obtain

Δ B (B \to X_{u} ℓ ν; M_{X} < 1.7 GeV / c^{2}, q^{2} > 8.0 {GeV}^{2} / c^{2}) = [7.37 \pm 0.89 (stat) \pm 1.12 (syst) \pm 0.55 (b \to c) \pm 0.24 (b \to u)] \times 10^{- 4}

and determine

| V_{u b} | = [4.66 \pm 0.28 (stat) \pm 0.35 (syst) \pm 0.17 (b \to c) \pm 0.08 (b \to u) \pm 0.58 (theory)] \times 10^{- 3}

.

Keywords

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