Precision Determination of Vub at an e+ e- B Factory
Jik Lee, Ian Shipsey
Abstract
Current methods of determining Vub are dominated by theoretical uncertainties. We present Monte Carlo simulations of three promising methods of determining Vub with small theoretical and experimental errors. We find that with data samples of order 1,000 fb-1 the B factories will attain combined experimental errors of a few % on Vub, much smaller than the theoretical errors associated with new inclusive methods. Lattice QCD offers the promise of rate calculations of exclusive semileptonic decays with errors of a few %. A data sample of order 10,000 fb-1, beyond the capabilities of the current B factories, may be required to achieve an experimental error on the exclusive rate comparable to the theoretical error.
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