E926
Goal:
- Observe this direct CP-violating decay.
- Measure BR to ~20%, to ~10%.
- 50 events/9000 hr ( ) (FY04-6).
Why Brookhaven?
- Highest intensity medium energy K beams
- Many backgrounds reduced in low energy beam
- Kinematic advantages (photons cannot be boosted to E=0)
- Beam can be bunched to measure K time-of-flight
- can access K cm, where background stands out.