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Does any one use the FeynRules package? If so, how can I implement a vertex of one Gluon and two octet scalars? I tried

LSG := Block[{mu,a}, 
    ExpandIndices[gs S+[a]. G[mu, a1].del[S-,mu]. S-[a2]. f[a,a1,a2], FlavorExpand-> -- ]
];

but it doesn't work. Also, what should I set in FlavorExpand -> ?

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