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

2012

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

Chen, Chuan-Hung, Geng, Chao-Qiang, Wang, Wei

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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.

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