Student seminars

#StudentSeminar: Massive corrections in scattering amplitudes

by Federico Coro (IFIC, CSIC-UV)

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

1001-Primera-1-1-1 - Paterna. Seminario



Multiloop scattering amplitudes in Quantum Chromodynamics (QCD) are a crucial ingredient for the precision physics program at the Large Hadron Collider (LHC). The required theoretical precision leads to an increase in the perturbative order, so we need to consider increasingly complicated Feynman diagrams due to the large number of scales that characterize the particles involved in the collision. Through complicated techniques the amplitudes are written using the form factors in terms of a minimal set of scalar integrals derived from Feynman diagrams. The study of these integrals is fundamental to understand the mathematical properties of scattering amplitudes

I will talk about the complications given by the introduction of massive quarks into loops, especially relating the computation of a scattering amplitude to the geometries that emerge by studying the properties of Feynman integrals. Finally I will show how to compute the amplitude through a semi-analytical method, with special application to the production of two photons at NNLO in perturbative QCD.

Thematic area: Theoretical Physics

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