Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. D 68, 091101 (2003). Copyright © 2003 American Physical Society. Permission to use.


We report on a search for the flavor-changing neutral current decay D0→µ+µ- in pp̅ collisions at √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→ π+ π- channel used for normalization, the Cabibbo-favored D0K-π+ 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 fraction Ɓ(D0→µ+µ-)<=2.5×10-6 (3.3×10-6) at the 90% (95%) confidence level.

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