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arxiv: 1204.3557 · v1 · submitted 2012-04-16 · ✦ hep-ph

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Testing for new physics in singly Cabibbo suppressed D decays

Yuval Grossman , Alexander L. Kagan , Jure Zupan
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classification ✦ hep-ph
keywords decaysphysicsviolationamplitudescabibbodeltarulessingly
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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 from interference of the dominant tree amplitudes with the Delta I=1/2 penguin amplitudes. The sum rules would be violated if the observed CP violation is due to new physics contributions to the effective weak Hamiltonian that change isospin by Delta I=3/2.

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