Abstract
The mass of the lepton has been measured in the decay mode using a pseudomass technique. The result obtained from of data collected with the Belle detector is . The upper limit on the relative mass difference between positive and negative leptons is at 90% confidence level.
- Received 2 February 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.011801
©2007 American Physical Society