The light-fermion contribution to the exact Higgs-gluon form factor in QCD

Understand

An analytical expression for the three-loop form factors for $ggH$ and $\gamma\gamma H$ is derived for the contributions which involve massless quark loops.

• The result is expressed in terms of harmonic polylogarithms.
• It fully agrees with previously obtained kinematical expansions, and confirms a recent semi-numerical approximation which extends over the full kinematic range.