Pseudo-scalar form factors at three loops in QCD

• DOI: 10.1007/jhep11(2015)169
• Publication Date: 2015-11-27T02:46:12Z
• Authors: Taushif Ahmed; Thomas Gehrmann; Prakash Mathews; Narayan Rana; V. Ravindran
• Keywords: Massless particle

The coupling of a pseudo-scalar Higgs boson to gluons is mediated through heavy quark loop. In the limit large mass, it described by an effective Lagrangian that only admits light degrees freedom. this theory, we compute three-loop massless QCD corrections form factor describes gluons. Due axial anomaly, operator for gluonic field strength mixes with divergence vector current. Working in dimensional regularization and using 't Hooft-Veltman prescription current, factors quarks Using universal infrared factorization properties, independently derive mixing finite renormalisation from group equation factors, thereby confirming recent results product expansion. part important ingredient precise prediction production cross section at hadron colliders. We discuss potential applications hard matching coefficient soft-collinear theory.