Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 46: Di-Higgs 1 (bbττ)

T 46.7: Talk

Tuesday, March 5, 2024, 17:30–17:45, Geb. 30.41: HS 1

Separation of HH and HZ final states Using Spin Correlations — •Celine Stauch, Christoph Ames, Otmar Biebel, Youn Jun Cho, Stefanie Götz, Edis Hrustanbegovic, Lars Linden, and Lukas von Stumpfeldt — LMU Munich

At the LHC a prominent background process to the HH production is the production of a H and Z boson. The HH and HZ processes are kinematically very similar since both processes have similar cross sections and the H and Z boson are close in mass. However, the H boson is a scalar particle while the Z boson has a spin of 1. The spin of the Z boson transfers to the final state particles and ultimately impacts their direction.
To investigate the impact of the particle spin on the final states, two approaches based on the Ellis-Karliner angle are applied. Further, methods to improve the selection of the final state jets are investigated. The results of this analysis suggest that a modified Ellis-Karliner angle provides an observable which is usable to distinguish between HH and HZ final states.

Keywords: di-Higgs; Neural Networks; Ellis-Karliner angle; Spin