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however i didn't derive it from the chiral anomaly
here's the paper for reference https://arxiv.org/pdf/1903.10632.pdf …
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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
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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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