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Okay, you are probably pointing me to equation (11) in "Dark Matter Through the Quark Vector Current Portal" http://arxiv.org/abs/1903.10632 which seems to be quoted from bottom of p. 7 in "Electromagnetic transitions in an effective chiral Lagrangian..." http://arxiv.org/abs/1204.4125 Hm⋯pic.twitter.com/Xf9UQJabrm
Right, we essentially just took that as the chiral Lagrangian for the vector mesons but I didn’t check it any deeper .. I have far more in depth notes I took that I could send you
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Here's a snapshot of how i dealt with the finding the feynman rules if it helps at all .. this is for the πωρ vertexpic.twitter.com/4ondZ0GEEK
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i imagine this method of 'factoring' would work similarly for the ωρφ vertex .. good luck, though .. i remember that references for the vector mesons in the anti-symmetric representation took a lot of digging
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