Critical basis dependence in bounding R-parity breaking couplings from neutral meson mixing
Katri Huitu, Kai Puolamäki, Da-Xin Zhang
Abstract
Assuming one nonzero product of two λ'-type couplings and working in two different bases for the left-handed quark superfields, the neutral meson mixings are used to bound these products. We emphasize the strong basis dependence of the bounds: in one basis many products contribute to neutral meson mixings at tree level, while in the other these products except one contribute at 1-loop level only and the GIM mechanism takes place. Correspondingly, these bounds differ between bases by orders of magnitudes.
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