Implications of the LHCb Evidence for Charm CP Violation
  The LHCb collaboration recently announced preliminary evidence for CP violation in D meson decays. We discuss this result in the context of the standard model (SM), as well as its extensions. In the absence of reliable methods to evaluate the hadronic matrix elements involved, we can only estimate qualitatively the magnitude of the non-SM tree level operators required to generate the observed central value. In the context of an effective theory, we list the operators that can give rise to the measured CP violation and investigate constraints on them from other processes. 
Gino Isidori, Jernej F. Kamenik, Zoltan Ligeti and Gilad Perez
hep-ph hep-ex