Our generators are T {\displaystyle T} , R {\displaystyle R} , Y = Φ {\displaystyle Y=\Phi } and B ± {\displaystyle B^{\pm }} . (You might consider splitting Y {\displaystyle Y} into two, Y u p {\displaystyle Y^{up}} and Y d n {\displaystyle Y^{dn}} ). In pictures, they are
The picture is
In formulas, this is
Thus the R3 component of d {\displaystyle d} is