Critical basis dependence in bounding R-parity breaking couplings from neutral meson mixing
نویسندگان
چکیده
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.
منابع مشابه
Symmetries and Symmetry Breaking *
In understanding the world of matter the introduction of symmetry principles following experimentation or using the predictive power of symmetry principles to guide experimentation is most profound. The conservation of energy, linear momentum, angular momentum, charge, and CPT involve fundamental symmetries. All other conservation laws are valid within a restricted subspace of the four interact...
متن کاملl - th / 9 30 10 02 v 1 4 J an 1 99 3 The Momentum Dependence of the ρ − ω Mixing Amplitude in a Hadronic Model
The Momentum Dependence of the ρ − ω Mixing Amplitude in a Hadronic Model. We calculate the momentum dependence of the ρ−ω mixing amplitude in a purely hadronic model. The basic assumption of the model is that the mixing amplitude is generated by N ¯ N loops and thus driven entirely by the neutron-proton mass difference. The value of the amplitude at the ω-meson point is expressed in terms of o...
متن کاملBilinear R-parity Violation in Rare Meson Decays
Abstract. We discuss rare meson decays K → πll and D → Kll (l, l = e, μ) in a supersymmetric extension of the standard model with explicit breaking of R-parity by bilinear Yukawa couplings in the superpotential. Estimates of the branching ratios for these decays are given. We also compare our numerical results with analogous ones previously obtained for two other mechanisms of lepton number vio...
متن کاملPhoton signatures for low energy supersymmetry breaking and broken R-parity
The possible phenomenological consequences of R-parity violating interactions in the framework of low energy supersymmetry breaking are studied. It is pointed out that even very weak R-parity violation would completely overshadow one of the basic signatures of low energy supersymmetry breaking models, that is the decay of the next to lightest supersymmetric particle into a photon (lepton) and m...
متن کاملR - parity Violation Effects through Soft Supersymmetry Breaking Terms and the Renormalisation Group
We present full renormalisation group equations for the MSSM with R-parity violation, including all soft supersymmetry breaking terms. The inclusion of dimensionless R-parity violating couplings can generate many possible low energy effects through the generation of off-diagonal soft masses violating lepton and quark flavour, and through the generation of lepton-Higgs mixing. We discuss the rel...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998