Model-independent Analysis of ΔF = 2 Transitions

Abstract

Previous phenomenological analyses of ΔF = 2 processes in supersymmetry [1, 2] were affected by a large uncertainty due to the SM contribution, since no determination of the Cabibbo-Kobayashi-Maskawa [3] (CKM) CPviolating phase was available in the presence of NP. A breakthrough was possible with the advent of B factories and the measurement of time-dependent CP asymmetries in B decays, allowing for a simultaneous determination of the CKM parameters and of the NP contributions to ΔF = 2 processes in the K ⁰ and B _d sectors [4, 5]. Furthermore, the Tevatron experiments have provided the first measurement of ΔmB _s and the first bounds on the phase of B _s −$\bar B_s$ mixing. Combining all these ingredients, we can now determine allowed ranges for all NP ΔF = 2 amplitudes in the down-quark sector. To complete the picture, the recent evidence of D ⁰ − $\bar D^0$ mixing allows to constrain NP contributions to the ΔC = 2 amplitude [6].