New Physics Models of Direct CP Violation in Charm Decays

Details New Physics Models of Direct CP Violation in Charm Decays New Physics Models of Direct CP Violation in Charm Decays

2012-02-13

arxiv.org/abs/1202.2866v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 13 figures. v2: typos corrected, reference added, published version

Scientific paper

In view of the recent LHCb measurement of Delta A_CP, the difference between the time-integrated CP asymmetries in D --> K+K- and D --> pi+pi- 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 D0-D0bar mixing, and from direct searches. While models that explain the large measured value for Delta A_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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