Hella SnoekNIKHEF3 Statistics versus sensibility The sensitivity to the CP asymmetry scales with Coupling to W 200 MeV ~1.1 For we are more sensitive to the CP asymmetry however we also have less events! So how does a low Branching Fraction affect the error on the CP asymmetry A? error on measurement of A: A - CP asymmetry N – number events for : A ~ N = for : A ~ 1 N =
