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Testing for new physics in singly Cabibbo suppressed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>decays
We devise tests for a new physics origin of the recently measured direct $CP$ violation in singly Cabibbo-suppressed $D$ decays. The tests take the form of sum rules for the $CP$ asymmetries in various $D$ decays. They are based on the fact that within the standard model $CP$ violation arises …