Choose your own talk: Three tales in higher-order calculations

by Arnd Behring (CERN)

Monday 22 Apr 2024, 14:00 → 16:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

Higher-order calculations are the backbone of precision predictions in particle physics. In this presentation, I want to offer three possible topics:

* The four-loop rho parameter and elliptic integrals
The rho parameter is an important electroweak precision observable. At three-loop order, the QCD corrections have been shown to contain elliptic Feynman integrals. Let's explore what lies beyond!

* N-jettiness beam functions at N3LO in QCD
The current frontier for differential distributions at the LHC are N3LO corrections. These predictions require intricate schemes to deal with singularities from soft and collinear radiation. Beam functions describe effects of collinear radiation along the incoming beams and constitute an important building block in these schemes. Let's see how to calculate them!

* Massive operator matrix elements for PDFs and deep-inelastic scattering
When massless quarks become massive, many curious things happen. Massive operator matrix elements connect massless and massive descriptions of quarks in the context of parton distribution functions and deep-inelastic scattering. While calculating them, we discover three spaces, connected by Mellin transformations, generating functions and discontinuities, and find an interesting connection to the optical theorem.

During the talk you, the audience, will have the opportunity to choose between those topics and decide how the talk is going to go. Bring your smartphone (or laptop) to vote!