integral from lim 0 to infinity of { [1/ (p^2+a^2) ] * e (-ibp) }dp

where i=(-1)^.5

a,b=const.

p= momentum

if anyone have mathematica plz.help me calc it.atleast tell how to proceed with the integral.does it fall under any std. integral.form.

can any of you suggest any book or site from which i can figure how to solve it.

plz. it's urgent i need to this result by monday.