Measurement of B0 to pi- l+ nu in untagged events and determination of   |Vub| at Belle
  A study of the charmless semileptonic decay B0 to pi- l+ nu using a large sample of untagged Upsilon(4S) to B Bbar events collected with the Belle detector at the KEKB asymmetric e+ e- collider is presented. The branching fraction of the decay is obtained and from this the Cabibbo-Kobayashi-Maskawa matrix element |Vub| is determined using two different approaches. 
Kevin Varvell (the Belle Collaboration)
hep-ex