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New physics models of direct CP violation in charm decays
Altmannshofer, Wolfgang Primulando, Reinard Yu, Chiu-Tien Primulando, Reinard
Altmannshofer, Wolfgang
Primulando, Reinard
Yu, Chiu-Tien
Primulando, Reinard
Abstract
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 D-0 - (D) over bar (0) 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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2012-01-01
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Physics
DOI
https://doi.org/10.1007/JHEP04(2012)049