The explanation of the large CP asymmetries in D0→(π +π -,K +K -) decays observed by the LHCb collaboration is likely to call for new physics beyond the Cabibbo-Kobayashi-Maskawa quark-mixing matrix (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 D0→(π +π -,K +K -), we derive the constraints on the diquark mass and couplings, which can be further examined in hadron colliders in the dijet final states.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2012 Apr 18|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)