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

Details Updated Search for the Flavor-Changing Neutral-Current Decay D^0 \to μ + μ- Updated Search for the Flavor-Changing Neutral-Current Decay D^0 \to μ + μ-

2010-08-30

arxiv.org/abs/1008.5077v1

Phys.Rev.D82:091105,2010

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 5 figures, RevTex format, submitted to PRD

Scientific paper

10.1103/PhysRevD.82.091105

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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