Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 20: Higgs 1 (boson final states)

T 20.3: Talk

Monday, March 4, 2024, 16:30–16:45, Geb. 30.41: HS 2

Methodological developments for H → γ γ data analyses in Run-3 at the CMS experiment — Caio Daumann, Johannes Erdmann, Nitish Kumar, •Florian Mausolf, and Jan Lukas Späh — III. Physikalisches Institut A, RWTH Aachen University

In 2022, the Large Hadron Collider resumed operations, with a proton-proton beam at an unprecedented centre-of-mass energy of √s=13.6 TeV. This marked the start of the Run-3 data taking period. Despite the Higgs boson’s diphoton decay channel having a relatively low branching ratio of approximately 0.23 %, it offers wide opportunities for precision analyses. Due to a low background level combined with the excellent precision in the reconstruction of photons, this decay channel is already accessible with the data taken so far in Run-3.

This presentation focuses on methodological developments for the H → γ γ analyses in Run-3 at the CMS experiment. A new software framework based on the columar-analysis approach is introduced. The framework’s application is demonstrated in the first Higgs boson cross-section measurement using the 2022 dataset taken with the CMS experiment. Furthermore, developments to enhance the sensitivity of this cross-section measurement are presented.

Keywords: Higgs boson; diphoton decay; cross section; CMS experiment; Run-3