Recent Measurements of CP Asymmetries of B o \phi K^0 and B o \eta' K_S at B-factories Suggest New CP Violation in Left-Handed Squark Mixing

摘要

Recent results on the mixing-induced CP asymmetries of B \to \phi K^0 and B\to \eta' K_S measured at B-factories appear to indicate discrepancies from theStandard Model expectation. Explanation of this possible anomaly is given inthe context of supersymmetric extension of the Standard Model. It is shown thatthe present data, if the average of two experiments is taken, impliesadditional CP violation appearing in the generation mixing of left-handedsquarks rather than that of right-handed ones. This explanation is argued todisfavor many mediation mechanisms of supersymmetry breaking, including minimalsupergravity, because renormalization group effects via Yukawa interaction areunlikely to generate the desired mass mixing.