Anomalous couplings in associated VH production with Higgs boson decay to massive b quarks at NNLO in QCD
Physical Review D American Physical Society (APS) 105:1 (2022) 014023
On linear power corrections in certain collider observables
Journal of High Energy Physics Springer Nature 2022:1 (2022) 93
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.Framing energetic top-quark pair production at the LHC
Journal of High Energy Physics Scuola Internazionale Superiore di Studi Avanzati 2021:7 (2021) 40
Abstract:
Top-quark pair production is central to many facets of LHC physics. At leading order, the top and anti-top are produced in a back-to-back topology, however this topology accounts only for a minority of the events with TeV-scale momentum transfer that contain a tt¯ pair. The remaining events instead involve the splitting of an initial or final-state gluon to tt¯. We provide simple quantitative arguments that explain why this is the case, and examine the interplay between different topologies and a range of variables that characterise the event hardness. We then develop a method to classify the topologies of individual events and use it to illustrate our findings in the context of simulated events, using both top partons and suitably defined fiducial tops. For events with large tt¯ invariant mass, we comment on additional features that have important experimental and theoretical implications.Estimating the impact of mixed QCD-electroweak corrections on the W-mass determination at the LHC
Physical Review D American Physical Society (APS) 103:11 (2021) 113002