Two-loop amplitudes for di-Higgs and di-pseudo-Higgs productions through quark annihilation in QCD

Understand

Through this article, we present the two-loop massless QCD corrections to the production of di-Higgs and di-pseudo-Higgs boson through quark annihilation in the large top quark mass limit.

• Within dimensional regularisation, we employ the non-anticommuting $\gamma_5$ and treat it under the Larin prescription.
• We discover the absence of any additional renormalisation, so-called contact renormalisation, that could arise from the short distance behaviour of two local operators.
• This finding is in corroboration with the operator product expansion.