Proposal for a Precision Measurement of |Vub|
  A new method for a precision measurement of the CKM matrix element |Vub| is discussed, which combines good theoretical control with high efficiency and a powerful discrimination against charm background. The resulting combined theoretical uncertainty on |Vub| is estimated to be 10%. 
Stefan W. Bosch, Bjorn O. Lange, Matthias Neubert, and Gil Paz