# A quesiton about multidimensional Fourier transform

## Main Question or Discussion Point

my question is the following

let be the Fourier transform $$\int_{-\infty}^{\infty}d^{4}p \frac{exp( ip*k)}{p^{2}+a^{2}}$$

here $$p^{2}= p_{0}^{2}+p_{1}^{2}+p_{2}^{2}+p_{3}^{2}$$

is the modulus of vector 'p' , here * means scalar product

for the scalar product i can use the definition $$p*k= |p|.|k|.cos(u)$$

so ony the modulus appear, my quesiton is if there is a way to set cos(u) =1 to get rid of the integration about angular variables, thanks