Model independent constraints among the Wtb, Zb(b)over-bar, and Zt(t)over-bar couplings

Using an effective Lagrangian approach, we perform a model-independent analysis of the interactions among electroweak gauge bosons and the third generation quarks, i.e. the Wtb, Zt (t) over tilde, and Zb (b) over bar couplings. After one imposes the known experimental constraint on the Zb(L)b(L) coupling, we show that the electroweak SU(2)(L) X U(1)(Y) symmetry of the standard model specifies the pattern of deviations of the Zt(L)t(L) and Wt(L)b(L) couplings, independent of underlying new physics scenarios. We study implications of the predicted pattern with data on the single top quark and Zt (t) over bar associated production processes at the Large Hadron Collider. Such an analysis could in principle allow for a determination of the Wtb coupling without prior knowledge of vertical bar V-tb vertical bar, which is otherwise difficult to achieve.