Speaker
Description
Precision measurements of Higgs boson production are essential for testing the Standard Model and searching for new physics. This talk presents progress towards measuring Higgs boson production cross sections in the diphoton decay channel at CMS using the Simplified Template Cross Section (STXS) framework. We leverage the first part of the Run 3 dataset collected at $\sqrt{s} = 13.6\,\text{TeV}$ since 2022, improving over the previous analysis via simplified analysis strategy with a global view to event classification. Initial validation using 2022 and 2023 data shows promising results, with extension to the 2024 dataset underway.
To address computational challenges arising from the large datasets in Run 3 and beyond, we explore recent developments in automatic differentiation support within the RooFit framework, which promises order-of-magnitude speedups in likelihood evaluation for complex analyses. This development is crucial for enabling increasingly granular measurements and combinations thereof as the dataset grows.
The anticipated two-fold increase in statistical precision from Run 3 - combined with our refined analysis techniques and computational advances - provides enhanced sensitivity to potential deviations from Standard Model predictions in Higgs boson production.