CP violation in $D^0\to (K^{-}{K}^{+},{\pi }^{-}{\pi }^{+})$ from diquarks

Abstract

The explanation of the large CP asymmetries in $D^0\to ({\pi }^{+}{\pi }^{-},K^{+}{K}^{-})$ decays observed by the LHCb collaboration is likely to call for new physics beyond the CKM paradigm. We explore new contributions caused by the color-sextet scalar diquark, and demonstrate that the diquark with the mass of order 1 TeV and nominal couplings with quarks can generate the CP asymmetries at the percent level. Using the experimental data on branching ratios and CP asymmetries of $D^0\to ({\pi }^{+}{\pi }^{-},K^{+}{K}^{-})$, we derive the constraints on the diquark mass and couplings, which can be further examined on hadron colliders in the dijet final states.

9 pages, 3 figures, reference added

References in corpus (3)

• Colored Resonant Signals at the LHC: Largest Rate and Simplest Topology
• Diquark Higgs at LHC
• Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks

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• Branching ratios and direct CP asymmetries in $D\to PP$ decays
• On Partial Compositeness and the CP asymmetry in charm decays
• Revisiting CP violation in $D\to PP$ and $VP$ decays
• On $SU(3{)}_F$ Breaking through Final State Interactions and CP Asymmetries in $D\to PP$ Decays
• Direct CP violation in beauty and charm hadron decays
• Brief Review of Charm Physics