Search for the Rare Decay B0→τ+τ− at BABAR

We present the results of a search for the decay B0→τ+τ− in a data sample of (232±3)×106 Υ(4S)→B¯¯¯B decays using the BABAR detector. Certain extensions of the standard model predict measurable levels of this otherwise rare decay. We reconstruct fully one neutral B meson and seek evidence for the signal decay in the rest of the event. We find no evidence for signal events and obtain B(B0→τ+τ−)<4.1×10−3 at the 90% confidence level.