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

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

2012-02-15

arxiv.org/abs/1202.3300v2

Phys. Rev. D 85, 077702 (2012)

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 3 figures, reference added

Scientific paper

10.1103/PhysRevD.85.077702

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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