Measurement of B{yields}D{sub s}{sup ()}K{pi} branching fractions

We report a measurement of the exclusive B{sup +} meson decay to the D{sub s}{sup (*)-}K{sup +}{pi}{sup +} final state using 657x10{sup 6}BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We use D{sub s}*{sup -}{yields}D{sub s}{sup -}{gamma} and the D{sub s}{sup -}{yields}{phi}{pi}{sup -}, K*(892){sup 0}K{sup -} and K{sub S}{sup 0}K{sup -} decay modes for D{sub s}{sup (*)} reconstruction and measure the following branching fractions: B(B{sup +}{yields}D{sub s}{sup -}K{sup +}{pi}{sup +})=(1.71{sub -0.07}{sup +0.08}(stat){sub -0.20}{sup +0.20}(syst){+-}0.15(B{sub int}))x10{sup -4} and B(B{sup +}{yields}D{sub s}*{sup -}K{sup +}{pi}{sup +})=(1.31{sub -0.12}{sup +0.13}(stat){sub -0.25}{sup +0.25}(syst){+-}0.12(B{sub int}))x10{sup -4}. The uncertainties are due to statistics, experimental systematic errors, and uncertainties of intermediate branching fractions, respectively.