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MadSpin Density : a new approach to the computation of matrix elements

Heirebaudt, Quentin
(2023)

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Heirebaudt_38051700_2023.pdf
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Details

Supervisors
Maltoni, Fabio
Faculty
Faculté des sciences
Degree label
Master [120] en sciences physiques, à finalité approfondie
Abstract
In this Master’s thesis, MadSpin density mode is introduced. This new method within the MadSpin framework aims at computing matrix elements using only the production and the decay parts of a diagram while keeping the spin correlation effects. This is done relying on the Narrow Width Approximation as well as on the MadGraph’s capacity to compute production and decay matrix elements. The theoretical aspects are introduced and the method used for a few processes. Even tough the current implementation does not allow more than one decaying particle, MadSpin density should allow the computation of matrix elements for processes that were not allowed in MadSpin e.g. loop induced processes as well as interferences between the Standard Model and some Beyond Standard Model models.