# Position space projection of the Single and two particle states of the Dirac Equation

1. Dec 18, 2011

### maverick280857

Hello,

In the notation adopted by Peskin and Schroeder, the single particle state is

$$\left|\boldsymbol{p}_1, s_1\right\rangle = \sqrt{2 E_{p}} {a_{p_1}^{s_1}}^{\dagger}\left|0\right\rangle$$

How does one write down

$$\left\langle r|\boldsymbol{p}_1, s_1\right\rangle = \sqrt{2 E_{p}} \left\langle r|{a_{p_1}^{s_1}}^{\dagger}|0\right\rangle$$

?