3 papers
hep-th2025
Analytic Four-Point Lightlike Form Factors and OPE of Null-Wrapped Polygons
Yuanhong Guo, Lei Wang, Gang Yang
We obtain for the first time the analytic two-loop four-point MHV lightlike form factor of the stress-tensor supermultiplet in planar SYM where the momentum carrie…
hep-th2024
Color-Kinematics Duality and Dual Conformal Symmetry for A Four-loop Form Factor in N=4 SYM
Guanda Lin, Gang Yang, Siyuan Zhang
We obtain the full-color four-loop three-point form factor of the stress-tensor supermultiplet in N=4 SYM, based on the color-kinematics (CK) duality and generalized unitarity meth…
hep-th2024
Is Yang-Mills Theory Unitary in Fractional Spacetime Dimensions?
Qingjun Jin, Ke Ren, Gang Yang +1
We present concrete evidence that Yang-Mills theory exhibits non-unitarity in non-integer spacetime dimensions. This violation of unitarity stems from evanescent operators that, wh…