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Chinese Physics C > 2025, Vol. 49 > Issue(9): 093102 DOI: 10.1088/1674-1137/addcc7

A three-body form factor at sub-leading power in the high-energy limit: planar contributions

  • Zhejiang Institute of Modern Physics, School of Physics, Zhejiang University, Hangzhou 310027, China

  • We analyzed two-loop planar contributions to a three-body form factor at next-to-leading power in the high-energy limit, where the masses of the external particles are much smaller than their energies. Calculations were performed by exploiting differential equations for the expansion coefficients, both to facilitate linear relations among them and to derive their analytic expressions. The results are expressed in terms of generalized polylogarithms involving a few simple symbol letters. Our method can readily be applied to calculations of non-planar contributions as well. Our results provide crucial information for establishing sub-leading factorization theorems for massive scattering amplitudes in the high-energy limit.
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