Background-field plus Feynman-Hellmann method in effective field theory yields first crude estimates of the rho meson's three electromagnetic form factors, with substantial contact contributions.
Three-particle Lellouch-L¨ uscher formalism in moving frames.JHEP, 02:214
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Form factors of the $\rho$ meson from effective field theory and the lattice
Background-field plus Feynman-Hellmann method in effective field theory yields first crude estimates of the rho meson's three electromagnetic form factors, with substantial contact contributions.