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Comment on studying the corrections to factorization in B -> D(*) X
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We propose studying the mechanism of factorization in exclusive decays of the form B->D(*)X by examining the differential decay rate as a function of the invariant mass of the light hadronic state X. If factorization works primarily due to the large N_c limit then its accuracy is not expected to decrease as the X invariant mass increases. However, if factorization is mostly a consequence of perturbative QCD then the corrections should grow with the X invariant mass. Combining data for hadronic tau decays and semileptonic B decays allows tests of factorization to be made for a variety of final states. We discuss the examples of B->D^*\pi^+\pi^-\pi^-\pi^0 and B->D^*\omega\pi^-. The mode B->D^*\omega\pi^- will allow a precision study of the dependence of the corrections to factorization on the invariant mass of the light hadronic state.
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A study of the corrections to factorization in $\bar{B}^0 \to D^{* +} \omega \pi^-$
A comparison of the omega-pi form factor from B meson decays with e+e- and tau data finds no statistically significant deviation from QCD factorization in the color-favored channel.
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