Evidence for direct CP violation in the measurement of the cabbibo-kobayashi-maskawa angle γ with B*→D( *)K(*)* Decays

Abstract

We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through a Dalitz plot analysis of neutral D-meson decays to KS0π+π- and KS0K+K- produced in the processes B*→DK*, B *→D*K* with D *→Dπ0, Dγ, and B*→DK ** with K**→KS0π*, using 468 million BB̄ pairs collected by the BABAR detector at the PEP-II asymmetric-energy e +e- collider at SLAC. We measure γ= (68±14±4±3)° (modulo 180°), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with γ=0 (no direct CP violation) with a significance of 3.5 standard deviations. © 2010 The American Physical Society.