Title: B FACTORY CONSTRAINTS ON ISOSINGLET DOWN QUARK MIXING, AND PREDICTIONS FOR OTHER CP-VIOLATING EXPERIMENTS
Abstract: In the main part of this paper we project forward to having B factory determinations of sin (2β) and sin (2α), for which we take several values. First, we use a joint χ 2 analysis of CKM experiments to constrain CKM matrix elements in the standard model, and experiments on the angles a, β and γ, and on x s and null CP asymmetries. Then we invoke mixing to a new isosinglet down quark (as in E 6 ) which induces FCNC’s that allow a Z 0 mediated contribution to [Formula: see text] mixing and which brings in new phases. We then repeat the χ 2 analysis, now including experimental constraints from FCNC’s as well, finding much larger ranges of prediction for the B factory. We then add projected B factory results on sin (2β) and sin (2α) and repeat both analyses. In (ρ, η) and (x s , sin (γ)) plots for the extra isosinglet down quark model, we find multiple regions that will require experiments on sin (γ) and/or x s to decide between, and possibly to effectively bound out the extra down quark contribution.