We report on a search for the flavor-changing neutral current
decay D0 --> mu+ mu- in p anti-p collisions at s**(1/2) = 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 --> mu+ mu- search channel, the kinematically similar D0 --> pi+
pi- channel used for normalization, the Cabbibo-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 --> mu+ mu-
search window, we set an upper limit on the branching fraction B(D0 --> mu+
mu-) \leq 2.5 x 10-6 (3.3 x 10-6) at the 90% (95%) confidence level.
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Updated: Friday, 2003 December 12 13:49:00 CST automatically from input from "Carol I. Picciolo"