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Starting from a microscopic lattice model, we investigate clustering,micellization and micelle ordering in semi-dilute solutions of AB diblockcopolymers in a selective solvent. To bridge the gap in length scales, frommonomers to ordered micellar structures, we implement a two-step coarsegraining strategy, whereby the AB copolymers are mapped onto ``ultrasoft''dumbells with monomer-averaged effective interactions between the centres ofmass of the blocks. Monte Carlo simulations of this coarse-grained model yieldclear-cut evidence for self-assembly into micelles with a mean aggregationnumber n of roughly 100 beyond a critical concentration. At a slightly higherconcentration the micelles spontaneously undergo a disorder-order transition toa cubic phase. We determine the effective potential between these micelles fromfirst principles.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Lett

Multiscale Coarse Graining of Diblock Copolymer Self-Assembly: From Monomers to Ordered Micelles