Critical basis dependence in bounding R-parity breaking couplings from neutral meson mixing

Details Critical basis dependence in bounding R-parity breaking couplings from neutral meson mixing Critical basis dependence in bounding R-parity breaking couplings from neutral meson mixing

1998-08-17

arxiv.org/abs/hep-ph/9808338v2

Phys.Lett. B446 (1999) 285-289

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, two references and some discussion added

Scientific paper

10.1016/S0370-2693(98)01532-9

Assuming one nonzero product of two $\lambda'$-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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