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Abstract

We present the first calculations of two-point two-loop form factors (FFs) with two identical operators insertion of supersymmetry protected half-BPS primary and unprotected Konishi in ${\cal N}=4$ supersymmetric Yang-Mills theory. To our surprise, the principle of maximal transcendentality which dictates the presence of identical highest weight terms in the scalar FFs of half-BPS and quark/gluon FFs in QCD is found to be violated. The conjecture that the FFs of half-BPS operator contain terms of uniform transcendentality weight is also found to break down. Moreover, the highest weight terms of half-BPS and Konishi FFs no longer match. The finite parts of FFs are also found not to exponentiate in contrast to the case of two-loop scalar FF of single half-BPS operator.