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arxiv 1008.5077 v1 pith:JW2ZQ7PS submitted 2010-08-30 hep-ex

Updated Search for the Flavor-Changing Neutral-Current Decay D⁰ to {μ} + {μ}-

classification hep-ex
keywords decaychannelflavor-changingneutral-currentsearchbranchingcabibbo-favoredcandidates
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. A displaced vertex trigger selects long-lived D0 candidates in the {\mu}+ {\mu}-, {\pi}+{\pi}-, and K-{\pi}+ decay modes. We use the Cabibbo-favored D0 \to K-{\pi}+ channel to optimize the selection criteria in an unbiased manner, and the kinematically similar D0 \to{\pi}+ {\pi}- channel for 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.

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