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We study the longitudinal polarization of the tau lepton in B -> D tau nudecay. After discussing possible sensitivities of tau decay modes to the taupolarization, we examine the effect of charged Higgs boson on the taupolarization in B -> D tau nu. We find a relation between the decay rate andthe tau polarization, and clarify the role of the tau polarization measurementin the search for the charged Higgs boson.

Tau longitudinal polarization in B -> D tau nu and its role in the search for charged Higgs boson