Showing papers by "Pierpaolo Mastrolia published in 2022"

From Diagrammar to Diagrammalgebra

Abstract: Analytic and algebraic properties of Feynman integrals are investigated within the de Rham theory for twisted co-homology. Linear relations, equivalent to integration-by-parts identites, differential and difference equations, as well as quadratic relations are derived by projections, using the intersection numbers. The presented results apply to the general class of Aomoto-Gel’fand-Euler integrals.

Intersection Numbers in Quantum Mechanics and Field Theory

Abstract: By elaborating on the recent progress made in the area of Feynman integrals, we apply the intersection theory for twisted de Rham cohomologies to simple integrals involving orthogonal polynomials, matrix elements of operators in Quantum Mechanics and Green’s functions in Field Theory, showing that the algebraic identities they obey are related to the decomposition of twisted cocycles within cohomology groups, and which, therefore, can be derived by means of intersection numbers. Our investigation suggests an algebraic approach generically applicable to the study of higher-order moments of probability distributions, where the dimension of the cohomology groups corresponds to the number of independent moments; the intersection numbers for twisted cocycles can be used to derive linear and quadratic relations among them. Our study offers additional evidence of the intertwinement between physics, geometry, and statistics.

Two-loop QED corrections to the di-muon production in e+ e- collisions, and related processes

Abstract: This contribution aims at elucidating the method we employed in the calculation of double-virtual interferences of di-muon production via electron-positron annihilation at Next-to-Next-to-Leading Order (NNLO) in Quantum Electrodynamics (QED), and heavy-quark pair production via light-quark annihilation at NNLO Quantum Chromodynamics (QCD).