A Study of Exclusive Charmless Semileptonic B Decay and |Vub|
Abstract
We study semileptonic B decay to the exclusive charmless states pi, rho/omega, eta and eta' using the 16 fb-1 CLEO Upsilon(4S) data sample. We find B(B0 -> pi-l+nu) = (1.37 +- 0.15stat +- 0.11sys) x 10-4 and B(B0 -> rho- l+ nu) = (2.93 +- 0.37stat +- 0.37sys) x 10-4, and find evidence for B+ -> eta' l+ nu, with B(B+ -> eta' l+ nu) = (2.66 +- 0.80stat +- 0.56sys ) x 10-4. From our B -> pi l nu rate for q2 > 16 GeV2 and lattice QCD we find |Vub| = (3.6 +- 0.4stat +- 0.2syst +0.6-0.4thy) x 10-3.
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