Abstract:
We report on a search for the flavor-changing neutral current decay
D0-->µ+µ- in pp-bar collisions at sqrt[s]=1.96 TeV using 65 pb-1 of
data collected by the CDF II experiment at the Fermilab Tevatron
Collider. A displaced-track trigger selects long-lived D0 candidates in
the D0-->µ+µ- search channel, the kinematically similar D0--> pi + pi
- channel used for normalization, the Cabibbo-favored D0-->K- pi +
channel used to optimize the selection criteria in an unbiased manner,
and their charge conjugates. Finding no signal events in the D0-->µ+µ-
search window, we set an upper limit on the branching fractionB(D0--
>µ+µ-)
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