We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to KS0pi+pi- and KS0K+K- produced in the processes B∓→DK∓, B∓-->D*K∓ with D*-->Dpi0, Dgamma, and B∓→DK*∓ with K*∓-->KS0pi∓, using 468 million BB̅ pairs collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We measure gamma=(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 gamma=0 (no direct CP violation) with a significance of 3.5 standard deviations.
Evidence for Direct CP Violation in the Measurement of the Cabbibo-Kobayashi-Maskawa Angle gamma with B--/+ -> D-(*K-)(()*()-/+) Decays
GAZ A;SIMI, GABRIELE;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;
2010
Abstract
We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to KS0pi+pi- and KS0K+K- produced in the processes B∓→DK∓, B∓-->D*K∓ with D*-->Dpi0, Dgamma, and B∓→DK*∓ with K*∓-->KS0pi∓, using 468 million BB̅ pairs collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We measure gamma=(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 gamma=0 (no direct CP violation) with a significance of 3.5 standard deviations.
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