Abstract
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) |
|---|---|
| Pages (from-to) | 5 |
| Number of pages | 1 |
| Journal | Physical review letters |
| Volume | 90 |
| Issue number | 14 |
| DOIs | |
| State | Published - 2003 |
| Externally published | Yes |
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