Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 99: Di-Higgs 3 (bbWW)

T 99.5: Talk

Thursday, March 7, 2024, 17:00–17:15, Geb. 30.41: HS 1

Employing Matrix Elements in the Search for Higgs Self-coupling — Christoph Ames, Otmar Biebel, Lars Linden, Celine Stauch, and •Edis Hrustanbegovic — Ludwigs-Maximilians-Universität, München

The Higgs boson is one of the most complex and least understood parts of the Standard Model. Even though it cleared up a lot of the questions this model posed, some of the predictions that came with it have yet to be proven by measurement. One of these predictions being the Higgs self-coupling. This coupling is especially difficult to measure, since it has a very small cross section along with background reactions that are far more common. Using the C++ software package MoMEMta the probability of a measurement aligning with the process H → HH → (b b)(W⁺ W⁻) → (b b) ((lν)(q′q)) can be calculated to determine if this decay took place, or if it is a background process. This is done by using the matrix element method, in which for the wave functions the measured particles and jets are being used to compute the cross section of the investigated process. Since the momenta of the initial partons are unknown, MoMEMta employs energy and momentum conservation to substitute the momenta of the initial partons and up to two more particles. However, the necessary Jacobian is not available for the considered HH process which, therefore, needs to be constructed from the available processes in the MoMEMta package. The challenges and the result of this implementation will be presented in this talk.

Keywords: Higgs Boson; Rare Decays; Matrix Element Method; MoMEMta