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CP violation from physics beyond the Standard Model is investigated in$B_{l4}$ decays: $B\to D\pi l\bar{\nu}_l$. The semileptonic $B$-meson decay toa $D$-meson with an emission of single pion is analyzed with heavy quarkeffective theory and chiral perturbation theory. In the decay process, weinclude various excited states as intermediate states decaying to the finalhadrons, $D+\pi$. The CP violation is implemented in a model independent way,in which we extend leptonic current by including complex couplings of thescalar sector and those of the vector sector in extensions of the StandardModel. With these complex couplings, we calculate the CP-odd rate asymmetry andthe optimal asymmetry. We find that the optimal asymmetry is sizable and can bedetected at $1\sigma$ level with about $10^6$-$10^7$ $B$-meson pairs, for somereference values of new physics effects.Comment: 25 pages, Latex, 4 figures include

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

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CPviolation in the semileptonicBl4 (B→