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We report on a search for the flavor-changing neutral-current decay D0 \to{\mu}+ {\mu}- in pp collisions at \surd s = 1.96 TeV using 360 pb-1 ofintegrated luminosity collected by the CDF II detector at the Fermilab Tevatroncollider. A displaced vertex trigger selects long-lived D0 candidates in the{\mu}+ {\mu}-, {\pi}+{\pi}-, and K-{\pi}+ decay modes. We use theCabibbo-favored D0 \to K-{\pi}+ channel to optimize the selection criteria inan unbiased manner, and the kinematically similar D0 \to{\pi}+ {\pi}- channelfor normalization. We set an upper limit on the branching fraction (D0 -->{\mu}+ {\mu}-) < 2.1 E-7 (3.0 E-7) at the 90% (95%) confidence level.

Updated Search for the Flavor-Changing Neutral-Current Decay D^0 \to {\mu} + {\mu}-