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We study the decay rate and the CP violating asymmetry of the exclusive B->pi ell+ ell- and B-> rho ell+ ell- decays in the case where one of the finalleptons is polarized. We calculate the contributions coming from the individualpolarization states in order to identify a so-called wrong sign decay, which isa decay with a given polarization, whose width and CP asymmetry are smaller ascompared to the unpolarized one. The results are presented for electron and tauleptons. We observe that in particular decay channels, one can identify a wrongsign decay which is more sensitive to new physics beyond the Standard Model.Comment: 24 pages, 10 figures; minor errors and misprints corrected,  references added, version to be published in EPJ

CP violation in polarized $B\rightarrow \pi \ell^ + \ell^-$ and $B\rightarrow \rho \ell^ + \ell^-$ decays