- #1
miemie0205
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Homework Statement
$$M=C/m(k.k'g^{\mu\nu} - k^{\nu}k'^{\mu})\epsilon ^*_{\mu}(k,\lambda)\epsilon _{\nu}(k',\lambda ')$$
Calculate $$\sum _{\lambda} |M|^2$$
Homework Equations
$$\sum _{\lambda}\epsilon ^*_{\mu}\epsilon _{\nu}=-g_{\mu\nu}$$
The Attempt at a Solution
Firstly, I find $$M^{\dagger}= C/m[k.k'g_{\mu\nu} + k_{\nu}k'_{\mu}]\epsilon _{\nu}\epsilon ^*_{\mu}$$
Is this right? I'm confused because I usually calculate hermitian conjugation of an operator, not a specificfour-vector like $$k_{\mu}$$