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07 February 2025
 
  » arxiv » 1508.0074

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CP Violation in $D^0 ightarrow K_SK_S$
Ulrich Nierste ; Stefan Schacht ;
Date 1 Aug 2015
AbstractThe direct CP asymmetry $a_{CP}^{mathrm{dir}}(D^0 ightarrow K_SK_S)$ involves exchange diagrams which are induced at tree-level in the Standard Model. Since the corresponding topological amplitude $E_{KK}$ can be large, $D^0 ightarrow K_SK_S$ is a promising discovery channel for charm CP violation. We estimate the penguin annihilation amplitude with a perturbative calculation and extract the exchange amplitude $E_{KK}$ from a global fit to $D$ branching ratios. Our results are further used to predict the size of mixing-induced CP violation. We obtain $vert a_{CP}^{mathrm{dir}}(D^0 ightarrow K_SK_S)vert leq 1.1\%$ (95\% C.L.). The same bound applies to the nonuniversal part of the phase between the $D!-overline{!D},$ mixing and decay amplitudes. If future data exceed our predictions, this will point to new physics or an enhancement of the penguin annihilation amplitude by QCD dynamics. We briefly discuss the implications of these possibilities for other CP asymmetries.
Source arXiv, 1508.0074
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