8.
在平面直角坐标系\(xoy\)中,直线\(l\)的参数方程为\(\begin{cases} & x=-2+\dfrac{1}{2}t \\ & y=2+\dfrac{\sqrt{3}}{2}t \end{cases}(t\)为参数\()\),直线\(l\)曲线\(C:{{\left( y-2 \right)}^{2}}-{{x}^{2}}=1\)交于\(A,B\)两点.
\((1)\)求线段\(AB\)的长
\((2)\)以原点\(O\)为极点,\(x\)轴的正半轴为极轴建立极坐标系,设点\(P\)的极坐标为\(\left( 2\sqrt{2},\dfrac{3\pi }{4} \right)\),求点\(P\)到线段\(AB\)中点\(M\)的距离.