- #1

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it is from peskin & schroeder page 507.

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- Thread starter moss
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- #1

- 49

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it is from peskin & schroeder page 507.

- #2

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What specifically don't you understand?

- #3

- 49

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i am latexing the 2 equations in a minute that i need help for.What specifically don't you understand?

- #4

- 49

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and then the 4-vertex of the same fields, it is from peskin & schroeder page 507.

I want to understand how to get the following vertex factors.

The equation are as follows;

\begin{equation}

eq-1=gf^{abc}[g^{\mu\nu}(k-p)^{\rho}+g^{\nu\rho}(p-q)^{\mu}+g^{\rho\mu}(q-k)^{\nu}]

\end{equation}

\begin{equation}

eq-2=-ig^{2}[f^{abc}f^{cde}(g^{\mu\nu}g^{\nu\sigma}-g^{\mu\sigma}g^{\nu\rho})+f^{ace}f^{bde}(g^{\mu\nu}g^{\rho\sigma}-g^{\mu\sigma}g^{\nu\rho})+f^{ade}f^{bce}(g^{\mu\nu}g^{\rho\sigma}-g^{\mu\rho}g^{\nu\sigma})]

\end{equation}

- #5

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- #6

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how do I get these terms by permutation of what? the group indices a,b,c,?

Bailin and Love says on page 127 that permutation of momentum and lorentz indices will give these vertex factors

but I am having problem in computing it.

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