Direct CP violation in D meson decays - Rencontres de Moriond

SM: Consistent picture
Another observation: from Br(D 0 → K + K − ) ≈ 2.8×Br(D 0 → π + π − )
|A(D 0 → K + K − )| = 1.8×|A(D 0 → π + π − )|
Should be the same in SU(3)F limit
Usually interpreted as a sign of large O(1) SU(3)F breaking
But note that
|A(D 0 → K − π + )| = 1.15×|A(D 0 → K + π − )|
for Cabibbo-favored (CF) decay D 0 → K − π + and doubly Cabibbo-suppressed
(DCS) decay D 0 → K + π − .
H CF
eff = GF
√2 VcsV ∗ ud
i=1,2
CiQ ¯ ds
i +h.c.
Joachim Brod (University of Cincinnati) CP violation in D decays 12 / 26