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We extend the range of predictions of the isosinglet (or vector) down quarkmodel to the fully allowed physical ranges, and also update this with theeffect of new physics constraints. We constrain the present allowed ranges ofsin(2*beta) and sin(2*alpha), gamma, x_s, and A_{B_s}. In models allowingmixing to a new isosinglet down quark (as in E_6) flavor changing neutralcurrents are induced that allow a Z^0 mediated contribution to B-Bbar mixingand which bring in new phases. In (rho, eta), (x_s, sin(gamma)), and (x_s,A_{B_s}) plots for the extra isosinglet down quark model which are hereinextended to the full physical range, we find new allowed regions that willrequire experiments on sin(gamma) and/or x_s to verify or to rule out an extradown quark contribution.Comment: 13 pages in RevTeX, 7 postscript figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Full range of predictions for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>physics from isosinglet down quark mixing

Full range of predictions forBphysics from isosinglet down quark mixing