Contributor info: Dr Vitaly Magerya

Jens Braun, Benjamin Campillo, Gudrun Heinrich, Marius Höfer, Stephen P. Jones, Matthias Kerner, Jannis Lang, Vitaly Magerya

SciPost Phys. Codebases 62 (2026) · published 9 January 2026 | Toggle abstract · pdf

We present a major update of the one-loop generator GoSam, containing performance improvements as well as new features, in particular functionalities that facilitate calculations beyond the Standard Model in Effective Field Theory frameworks.

Jens Braun, Benjamin Campillo, Gudrun Heinrich, Marius Höfer, Stephen P. Jones, Matthias Kerner, Jannis Lang, Vitaly Magerya

SciPost Phys. Codebases 62-r3.0 (2026) · published 9 January 2026 | Toggle abstract · src

We present a major update of the one-loop generator GoSam, containing performance improvements as well as new features, in particular functionalities that facilitate calculations beyond the Standard Model in Effective Field Theory frameworks.

Víctor Bresó-Pla, Gudrun Heinrich, Vitaly Magerya, Anton Olsson

SciPost Phys. 19, 123 (2025) · published 10 November 2025 | Toggle abstract · pdf

The calculation of scattering amplitudes at higher orders in perturbation theory has reached a high degree of maturity. However, their usage to produce physical predictions within Monte Carlo programs is often precluded by the slow evaluation of two- and higher-loop virtual amplitudes, particularly those calculated numerically. As a remedy, interpolation frameworks have been successfully used for amplitudes depending on up to two kinematic invariants. For amplitude interpolation with more variables, such as the five dimensions of a $2\to 3$ phase space, efficient and reliable solutions are sparse. This work aims to pave the way for using amplitude interpolation in higher-dimensional phase spaces by reviewing state-of-the-art interpolation methods, and assessing their performance on a selection of $2\to 3$ scattering amplitudes. Specifically, we investigate interpolation methods based on polynomials, splines, spatially adaptive sparse grids, and neural networks (multilayer perceptron and Lorentz-Equivariant Geometric Algebra Transformer), all under the constraint of limited obtainable data. Our additional aim is to motivate further studies of the interpolation of scattering amplitudes among both physicists and mathematicians.