Thermal one-point functions and single-valued polylogarithms

I point out that the thermal one-point functions of a pair relevant operators in massive free QFTs, odd dimensions and presence an imaginary chemical potential for U(1) global charge, are given by certain classes single-valued polylogarithms. This result is verified direct calculation using OPE. The complex argument polylogarithms parametrize two-dimensional subspace deformations generalised CFTs, while rank related to dimension d. may be compared with well-known representation as multiloop Feynman amplitudes. As example, function charge d-dimensions generalises average twist operator harmonic oscillators conformal ladder graphs four dimensions.