The mu-term corrections from bound-state quantization are reproduced exactly as residues of the F-term integral for elementary non-diagonal form factors, confirming the connection between the two formalisms.
Form factor approach to diagonal finite volume matrix elements in Integrable QFT
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We derive an exact formula for finite volume excited state mean values of local operators in 1+1 dimensional Integrable QFT with diagonal scattering. Our result is a non-trivial generalization of the LeClair-Mussardo series, which is a form factor expansion for finite size ground state mean values.
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Finite volume corrections of non-diagonal form factors
The mu-term corrections from bound-state quantization are reproduced exactly as residues of the F-term integral for elementary non-diagonal form factors, confirming the connection between the two formalisms.