The KTeV experiment at Fermilab has isolated a total of 132 events from the rare decay [Formula presented], with an estimated background of 0.8 events. The branching ratio of this mode is determined to be [Formula presented], with a radiative cutoff of [Formula presented]. The first measurement using this mode of the parameter [Formula presented] from the D’Ambrosio-Isidori-Portolès (DIP) model of the [Formula presented] vertex yields a result of [Formula presented], consistent with values obtained from other decay modes. Because of the limited statistics, no sensitivity is found to the DIP parameter [Formula presented]. We use this decay mode to set limits on CP and lepton violation.
|Original language||English (US)|
|Number of pages||1|
|Journal||Physical review letters|
|State||Published - 2003|
ASJC Scopus subject areas
- Physics and Astronomy(all)