Search for $CP$ Violation and Measurement of the Branching Fraction in the Decay $D^0\to K_S^0{K}_S^0$

Abstract

We report a study of the decay $D^0\to K_S^0{K}_S^0$ using 921~fb${}^{-1}$ of data collected at or near the ${\rm Y}(4S)$ and ${\rm Y}(5S)$ resonances with the Belle detector at the KEKB asymmetric energy $e^{+}{e}^{-}$ collider. The measured time-integrated $CP$ asymmetry is $A_{CP}(D^0\to K_S^0{K}_S^0)=(-0.02\pm 1.53\pm 0.02\pm 0.17)\%$, and the branching fraction is $\mathcal{B}(D^0\to K_S^0{K}_S^0)$ = (1.321 $\pm$ 0.023 $\pm$ 0.036 $\pm$ 0.044) $\times$ 10${}^{-4}$, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode ($D^0\to K_S^0{\pi }^0$). These results are significantly more precise than previous measurements available for this mode. The $A_{CP}$ measurement is consistent with the standard model expectation.

arXiv comment7 pages,1 figure, Submitted to PRL

References in corpus (10)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Size of direct CP violation in singly Cabibbo-suppressed D decays
• SU(3)-Flavor Anatomy of Non-Leptonic Charm Decays
• Measurements of Branching Fractions of $\tau$ Lepton Decays with one or more $K_S^0$
• CP Violation in $D^0\to K_S{K}_S$
• Search for CP Violation in $D^0\to K_S^0{\pi }^0$, $D^0\to {\pi }^0{\pi }^0$ and $D^0\to K_S^0{K}_S^0$
• Effect of nuclear interactions of neutral kaons on CP asymmetry measurements
• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K_S^0{K}_S^0$ decays
• Measurement of D0-D0bar mixing and search for CP violation in D0 -> K+K-, pi+pi- decays with the full Belle data set
• Measurements of the branching fractions for $D^{+}\to K_S^0{K}_S^0{K}^{+}$, $K_S^0{K}_S^0{\pi }^{+}$ and $D^0\to K_S^0{K}_S^0$, $K_S^0{K}_S^0{K}_S^0$

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