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We report measurements of the decays B- -> Ds(*)+ K- l- nubar in a datasample containing 657x10^6 BBbar pairs collected with the Belle detector at theKEKB asymmetric-energy e+e- collider. We observe a signal with a significanceof 6 sigma for the combined Ds and Ds* modes and find the first evidence of theB- -> Ds+ K- l- nubar decay with a significance of 3.4 sigma. We measure thefollowing branching fractions: BF(B- -> Ds+ K- l nubar) = (0.30 +/- 0.09(stat)+0.11 -0.08(syst)) x 10^-3 and BF(B- -> Ds*+ K- l- nubar) = (0.59 +/-0.12(stat) +/- 0.15(syst)) x 10^-3 and set an upper limit BF(B- -> Ds*+ K- l-nubar) < 0.56 x 10^-3 at the 90% confidence level. We also present the firstmeasurement of the Ds+K- invariant mass distribution in these decays, which isdominated by a prominent peak around 2.6 GeV/c^2.

Evidence for B- -> Ds+ K- l- nubar and search for B- -> Ds*+ K- l- nubar