Abstract
We have performed a search for the flavor-changing neutral-current decays , where is either or , using a sample of decays collected with the BABAR detector. We observe no evidence of a signal and measure the upper limit on the isospin-averaged branching fraction to be at 90% confidence level. We also search for the lepton-flavor-violating decays and measure an upper limit on the isospin-averaged branching fraction of at 90% confidence level.
- Received 9 March 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.051801
©2007 American Physical Society