Solving 3-Momentum Integral: Seeking Assistance

[Ang Han Wei]

I was recently told that the integral for a 3-momentum d^3p = 4∏∫p^2 dp

But I don't know what how is this integtal done.

Any help?

 

[jfizzix]

This integral was done in spherical coordinates
\int dxdydz = \int r^{2}sin(\theta)dr d\theta d\phi
if what you're integrating over does not depend on \theta or \phi, then you can integrate over those variables giving you an additional factor of 4 \pi. Thus
\int dxdydz = 4\pi \int r^{2}d r.

I expect d^3p is shorthand for dp_{x}dp_{y}dp_{z}.