On the Universality of CP Violation in Delta F = 1 Processes

Details On the Universality of CP Violation in Delta F = 1 Processes On the Universality of CP Violation in Delta F = 1 Processes

2012-02-22

arxiv.org/abs/1202.5038v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures

Scientific paper

We show that new physics that breaks the left-handed SU(3)_Q quark flavor symmetry induces contributions to CP violation in Delta F = 1 processes which are approximately universal, in that they are not affected by flavor rotations between the up and the down mass bases. Therefore, such flavor violation cannot be aligned, and is constrained by the strongest bound from either the up or the down sectors. We use this result to show that the bound from eps'/eps prohibits an SU(3)_Q breaking explanation of the recent LHCb evidence for CP violation in D meson decays. Another consequence of this universality is that supersymmetric alignment models with a moderate mediation scale are consistent with the data, and are harder to probe via CP violating observables. With current constraints, therefore, squarks need not be degenerate. However, future improvements in the measurement of CP violation in D-Dbar mixing will start to probe alignment models.

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