Measurement of |Vub| Using Inclusive BXuν Decays with a Novel Xu-Reconstruction Method

H. Kakuno et al. (Belle Collaboration)
Phys. Rev. Lett. 92, 101801 – Published 10 March 2004

Abstract

We report the measurement of an inclusive partial branching fraction for charmless semileptonic B decay and the extraction of |Vub|. Candidates for BXuν are identified with a novel Xu reconstruction method based on neutrino reconstruction via missing 4-momentum and a technique called “simulated annealing.” Based on 86.9   fb1 of data taken with the Belle detector, we obtain ΔB(BXuν;MX<1.7   GeV/c2,q2>8.0   GeV2/c2)=[7.37±0.89(stat)±1.12(syst)±0.55(bc)±0.24(bu)]×104 and determine |Vub|=[4.66±0.28(stat)±0.35(syst)±0.17(bc)±0.08(bu)±0.58(theory)]×103.

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  • Received 23 November 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.101801

©2004 American Physical Society

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Vol. 92, Iss. 10 — 12 March 2004

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