Search for the Flavor-Changing Neutral-Current in the Decay Σ+→pμ+μ−

The Fermilab HyperCP (E871) experiment collected on the order of 1010 hyperon decays. Based on an analysis of the data set collected in 1999 run, we will report on the observation of events with reconstructed masses consistent with that of Σ+ assuming the final state pμ+μ−. If the observed events are the decay Σ+→pμ+μ−, then they would be the first evidence of this decay. Other possible interpretations of the observed events will also be discussed.