(1) Establish for each of the following decays whether it is allowed or forbidden, giving the reasons. The left upper label is the colour, the right lower one the chirality.              

(a) W^-→^Bs_L+Bu̅_R,

(b) W^-→^Bd_R+^Bu̅_L,

(c) W^-→^Rd_L+^Bu̅_R,

(d) Z0→^Gu_L+^Gu̅_R,

(e) Z0→^Gu_R+^Gu̅_R,

(f) Z0→^Gu_R+^Gc̅_L,

(g) Z0→^Gt_L+^Gt̅_R.

(2) Is the three-quark status  

bound?

b,+(by+b,)b,+(b,+b,)b, |(b,+b, R B G (q+q)+*q(q+*q)+q(*q+q)]