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The B{sup 0} {yields} D*{sup -} a{sub 1}{sup +} branching fraction has been measured with data collected by the BaBar experiment in 1999 and 2000 corresponding to a total integrated luminosity of 20.6 fb{sup -1}. Signal events have been selected using a partial reconstruction technique, in which only the a{sub 1}{sup +} and the slow pion ({pi}{sub s}) from the D*{sup -} decay are identified. A signal yield of 18400 {+-} 1200 events has been found, corresponding to a preliminary branching fraction of (1.20 {+-} 0.07(stat) {+-} 0.14(syst))%.

MEASUREMENT OF THE B0 ---&gt; D*- A+(1) BRANCHING FRACTION WITH PARTIALLY RECONSTRUCTED D*

MEASUREMENT OF THE B0 ---> D- A+(1) BRANCHING FRACTION WITH PARTIALLY RECONSTRUCTED D