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In the standard model, we study CP violating rate asymmetries in the decayb->d l^+ l^- when one of the leptons is polarised. We find an asymmetry of (5-- 15)% in the polarised decay spectrum which is comparable to known resultsfor the unpolarised case. In the kinematic region separating the rho-omega and$c \bar c$ resonances, which is also theoretically cleanest, the polarisedcontribution to the asymmetry is larger than the unpolarised results. In orderto observe a 3 sigma signal for direct CP violation in the polarised spectrum,assuming 100% efficiency, about 10^10 $B \bar B$ pairs are required at a Bfactory. Our results indicate an asymmetric contribution from the individualpolarisation states to the unpolarised CP asymmetry. Taking advantage of this,one can attribute any new physics to be most sensitive to a specificpolarisation state.Comment: 23 pages, one reference adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Standard modelCPviolation in polarizedb→dl+l−