- #1
thoms2543
- 51
- 0
I have a process that a scalar and a photon at the final state. When we take the complex conjugate and sum over photon final polarization state...it give negative sign in the differential cross section...what does this mean? the trace didn't give negative value.
M=M^{\mu}\cdot\epsilon_{\nu}
\sum\left|M\right|^2=-M^{\mu}M_{\mu}
M=M^{\mu}\cdot\epsilon_{\nu}
\sum\left|M\right|^2=-M^{\mu}M_{\mu}
