Speaker
Duarte Fontes
Description
Infrared sensitivity in asymptotically free non-abelian gauge theories is intimately connected to non-perturbative effects in processes with large momentum transfer. In the renormalon framework, such effects are probed by introducing a small gluon mass. Yet this procedure breaks gauge invariance, effectively restricting collider applications to reactions without gluons at Born level. In this talk, I present a gauge-invariant framework in which gluons acquire a small mass via the Higgs mechanism. I compute the heavy-quark pole–$\overline{{\rm MS}}$ mass relation through $\mathcal{O}(\alpha_s^2)$, providing a controlled laboratory to study infrared sensitivity in genuinely non-abelian processes.