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The decay modes $\bar{B}\to D^{(*)}\tau\bar{\nu}_{\tau}$ are sensitive tocharged scalar effects, such as the charged Higgs effects. In this paper wesuggest a method to determine their effects by using the ratio of branchingfractions and forward-backward asymmetries. In particular, forward-backwardasymmetries on $\bar{B}\to D^{(*)}\tau(\to \pi\nu_{\tau})\bar{\nu}_{\tau}$,$\bar{B}\to D^{(*)}\tau(\to \rho\nu_{\tau})\bar{\nu}_{\tau}$, and $\bar{B}\toD^{(*)}\tau(\to a_1\nu_{\tau})\bar{\nu}_{\tau}$ play an important role, whichdiscriminate the Standard Model from other New Physics scenarios.

Constraints on the charged scalar effects using the forward-backward asymmetry on $B\to D^{(*)}\tau\bar{\nu_{\tau}}$