1204.3557 (Yuval Grossman et al.)

Testing for new physics in singly Cabibbo suppressed D decays    [PDF]

Yuval Grossman, Alexander L. Kagan, Jure Zupan

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.

View original: http://arxiv.org/abs/1204.3557