QCD Meets Gravity 2023

Session

Tuesday AM 2

12 Dec 2023, 10:45

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

Conveners

Tuesday AM 2: Feynman Integrals

• Henrik Johansson

13. Symbol Alphabets from the Landau Singular Locus

Christoph Dlapa (DESY Hamburg)

12/12/2023, 10:45

I present work which provides evidence through two loops that rational letters of polylogarithmic Feynman integrals are captured by the Landau equations, when the latter are recast as a polynomial of the kinematic variables of the integral, known as the principal A-determinant. Focusing on one loop, I further discuss how all square-root letters may also be obtained, by re-factorizing the...

14. Measurements and Crossing

Mathieu Giroux (McGill University)

12/12/2023, 11:15

Crossing symmetry in interacting quantum field theory suggests that particles and antiparticles traveling back in time are indistinguishable. To rigorously prove this property, it is necessary to show that on-shell observables across different channels are boundary values of the same analytic function. Known non-perturbative proofs in specific cases heavily rely on fundamental physical...