Oram Gedalia, Jernej F. Kamenik, Zoltan Ligeti, Gilad Perez
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.
View original:
http://arxiv.org/abs/1202.5038
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