On the interference of $ggH$ and $c\bar{c}H$ Higgs production mechanisms and the determination of charm Yukawa coupling at the LHC

Understand

Higgs boson production in association with a charm-quark jet proceeds through two different mechanisms - one that involves the charm Yukawa coupling and the other that involves direct Higgs coupling to gluons.

• The interference of the two contributions requires a helicity flip and, therefore, cannot be computed with massless charm quarks.
• In this paper, we consider QCD corrections to the interference contribution starting from charm-gluon collisions with massive charm quarks and taking the massless limit, $m_c \to 0$.
• The behavior of QCD cross sections in that limit differs from expectations based on the canonical QCD factorization.