Standard Model predictions for rare K and B decays without new physics infection.

The Standard Model (SM) does not contain by definition any new physics (NP) contributions to any observable but contains four CKM parameters which are not predicted by this model. We point out that if these four parameters are determined in a global fit which includes processes that are infected by NP and therefore by sources outside the SM, the resulting so-called SM contributions to rare decay branching ratios cannot be considered as SM contributions to the latter. On the other hand SM predictions, that are from the CKM dependence, can be obtained for suitable ratios of the and rare decay branching ratios to , and , all calculated within the SM. These three observables contain by now only small hadronic uncertainties and are already well measured so that rather precise SM predictions for the ratios in question can be obtained. In this context the of NP infection in the sector is provided by a plot that involves , , , and the mixing induced CP-asymmetry . As with the present hadronic matrix elements this test turns out to be , assuming negligible NP infection in the sector and setting the values of these four observables to the experimental ones, allows to obtain SM predictions for all and rare decay branching ratios that are most accurate to date and as a byproduct to obtain the full CKM matrix on the basis of transitions Using this strategy we obtain SM predictions for 26 branching ratios for rare semileptonic and leptonic and decays with the pair or the pair in the final state. Most interesting turn out to be the anomalies in the low bin in ( ) and ( ).