Three-loop helicity amplitudes for four-quark scattering in massless QCD
Journal of High Energy Physics Scuola Internazionale Superiore di Studi Avanzati 2021:10 (2021) 206
Abstract:
We compute the three-loop corrections to the helicity amplitudes for qq¯¯ → QQ¯¯¯¯ scattering in massless QCD. In the Lorentz decomposition of the scattering amplitude we avoid evanescent Lorentz structures and map the corresponding form factors directly to the physical helicity amplitudes. We reduce the amplitudes to master integrals and express them in terms of harmonic polylogarithms. The renormalised amplitudes exhibit infrared divergences of dipole and quadrupole type, as predicted by previous work on the infrared structure of multileg scattering amplitudes. We derive the finite remainders and present explicit results for all relevant partonic channels, both for equal and different quark flavours.Fierz–Pauli theory reloaded: from a theory of a symmetric tensor field to linearized massive gravity
European Physical Journal C Springer Nature 81:2 (2021) 171
A note on harmonic gauge(s) in massive gravity
Physics Letters B Elsevier 807:10 August 2020 (2020) 135530