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In this work we shall derive expressions for the single and double leptonpolarization asymmetries for the exclusive decay $B \to K^* \ell^+ \ell^-$,using the most general model independent effective Hamiltonian. We haveconducted this study with this particular channel as it has the highestbranching ratio among the various purely leptonic and semi-leptonic decaymodes, making this mode particularly useful for studying physics beyond the SM.We have also analyzed the effects on these polarization asymmetries, and hencethe physics underlying it, when complex phases are included in some of theWilson coefficients.Comment: version accepted in JHEP, formating changed to JHEP style, LaTeX file  23 pages including 15 eps figure

Lepton polarization asymmetries forB→K*ell+ell−: A Model Independent approac

Lepton polarization asymmetries forB→K*ell⁺ell⁻: A Model Independent approac