Abstract
In view of the recent LHCb measurement of ΔA CP, the difference between the time-integrated CP asymmetries in D → K + K − and D → π+π− decays, we perform a comparative study of the possible impact of New Physics degrees of freedom on the direct CP asymmetries in singly Cabibbo suppressed D meson decays. We systematically discuss scenarios with a minimal set of new degrees of freedom that have renormalizable couplings to the SM particles and that are heavy enough such that their effects on the D meson decays can be described by local operators. We take into account both constraints from low energy flavor observables, in particular D 0 − \( {\overline D^0} \) mixing, and from direct searches. While models that explain the large measured value for ΔA CP with chirally enhanced chromomagnetic penguins are least constrained, we identify a few viable models that contribute to the D meson decays at tree level or through loop induced QCD penguins. We emphasize that such models motivate direct searches at the LHC.
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Altmannshofer, W., Primulando, R., Yu, CT. et al. New physics models of direct CP violation in charm decays. J. High Energ. Phys. 2012, 49 (2012). https://doi.org/10.1007/JHEP04(2012)049
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DOI: https://doi.org/10.1007/JHEP04(2012)049