Evidence for direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B-+ --> D(*) K(*)-+ decays

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 $K_S^0{\pi }^{+}{\pi }^{-}$ and $K_S^0{K}^{+}{K}^{-}$ produced in the processes $B^{\mp }\to D{K}^{\mp }$, $B^{\mp }\to D^{\ast }{K}^{\mp }$ with $D^{\ast }\to D{\pi }^0,D\gamma$, and $B^{\mp }\to D{K}^{\ast \mp }$ with $K^{\ast \mp }\to K_S^0{\pi }^{\mp }$, using 468 million $B\bar{B}$ pairs collected by the BABAR detector at the PEP-II asymmetric-energy $e^{+}{e}^{-}$ collider at SLAC. We measure $\gamma =(68\pm 14\pm 4\pm 3{)}^{\circ }$ ({\rm mod $180^{\circ }$}), 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.

7 pages, 2 postscript figures, 2 tables, appendix with 4 pages containing supplementary material, submitted to Phys. Rev. Lett

References in corpus (3)

• Measurement of phi_3 with Dalitz plot analysis of B+ -> D(*)K(*)+ decay
• CP violation and limits on New Physics including recent $B_s$ measurements
• Study of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-

Cited by in corpus (23)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• First Measurement of phi_3 with a Model-independent Dalitz Plot Analysis of B->DK, D->KsPiPi Decay
• First determination of the $CP$ content of $D\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ and updated determination of the $CP$ contents of $D\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $D\to K^{+}{K}^{-}{\pi }^0$
• Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays
• Measurement of CP observables in B+- --> D_CP K+- decays and constraints on the CKM angle gamma
• A model-independent Dalitz plot analysis of $B^{\pm }\to D{K}^{\pm }$ with $D\to K_{\mathrm{S}}^0{h}^{+}{h}^{-}$ ($h=\pi ,K$) decays and constraints on the CKM angle $\gamma$
• Measurement of $CP$ violation and constraints on the CKM angle $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays
• CP violation in the B system
• Direct CP violation in beauty and charm hadron decays
• Improved model-independent determination of the strong-phase difference between $D^0$ and ${\bar{D}}^0\to K_{\mathrm{S},\mathrm{L}}^0{K}^{+}{K}^{-}$ decays
• Model-independent $D^0-\overline{D^0}$ mixing and CP violation studies with $D^0\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ and $D^0\to K_{\mathrm{S}}^0{K}^{+}{K}^{-}$
• Search for b --> u Transitions in B^{+-} --> [K^{-+} pi^{+-} pi0]_D K^{+-} Decays
• Study of scalar meson a_0(1450) from B \to a_0(1450)K^* Decays
• Dalitz plot studies of $D^0\to K_S^0{K}^{+}{K}^{-}$ decays in a factorization approach
• Measurement of the $CP$-even fraction of $D^0\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$
• Relative phases in Dalitz plot amplitudes for $D^0\to K_S{\pi }^{+}{\pi }^{-}$ and $D^0\to {\pi }^0{K}^{+}{K}^{-}$
• Origins of the method to determine the CKM angle $\gamma$ using $B^{\pm }\to D{K}^{\pm }$, $D\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ decays
• Toward extracting $\gamma$ from $B\to DK$ without binning
• What We've Learned from Heavy Flavour Experiments Since CKM2010
• Status of CKM Angle Measurements, a report from BaBar and BELLE
• CP violation and CKM matrix elements at the B factories
• Results on CP violation and CKM UT angles from Belle and BaBar