ON RIGHT-HANDED-B DECAY DOMINANCE

In the Gronau-Wakaizumi scenario of right-handed b decay dominance, V(cd)R is vanishingly small while large V(td)R and V(ts)R lead to potential problems with the K(L)-K(S) mass difference. Allowing the b --> u transition to be dominantly left-handed, we arrive at a more symmetric form of quark mixing matrices, where V(L), V(R) are constituted mostly of mixing between first and second, and second and third generations, respectively. A third possibility of having b --> c left-handed as usual, but b --> u dominantly right-handed, is ruled out by the epsilon parameter and B(d) mixing. Experimental consequences such as Cabibbo suppressed decays, penguin rates, and CP violation, are discussed. The best way to rule out right-handed b --> c decay dominance is to find B --> D(*)D-(*) modes at the 0.1% level.