$$R_J\left(x,y,z,p\right)=\frac{3}{2}{\int \; <!--nolimits-->}_0^{\infty }{\left(t+p\right)}^{-1}{\left[\left(t+x\right)\left(t+y\right)\left(t+z\right)\right]}^{-\frac{1}{2}}dt$$