Abstract
A search for mixing in the neutral D meson system has been performed using semileptonic D{sup 0}{yields}K{sup (*)-}e{sup +}{nu} and D{sup 0}{yields}K{sup (*)-}{mu}{sup +}{nu} decays. Neutral D mesons from D*{sup +}{yields}D{sup 0}{pi}{sub s}{sup +} decays are used and the flavor at production is tagged by the charge of the slow pion. The measurement is performed using 492 fb{sup -1} of data recorded by the Belle detector. From the yield of right-sign and wrong-sign decays arising from nonmixed and mixed events, respectively, we measure the ratio of the time-integrated mixing rate to the unmixed rate to be R{sub M}=(1.3{+-}2.2{+-}2.0)x10{sup -4}. This corresponds to an upper limit of R{sub M}<6.1x10{sup -4} at the 90% C.L.
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