Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 79: Experimental methods IV

T 79.3: Talk

Thursday, April 2, 2020, 17:00–17:15, H-ÜR 1

Studies on Monte Carlo tuning including correlation of uncertainties — •Salvatore La Cagnina, Johannes Erdmann, and Kevin Kröninger — TU Dortmund, Lehrstuhl für Experimentelle Physik IV

Monte Carlo (MC) simulations are an essential aspect of data analysis at the LHC. One aspect of MC event generation involves hadronisation and parton shower models. Since these models are based on physics approximations, they introduce a number of parameters. These param- eters cannot be inferred from first principles. Therefore, their values have to be optimized using numerical tools and experimental data (MC tuning). Generally, MC tuning is performed by choosing observables that are sensitive to the parameters. Afterwards, a fit of the parame- ters to data using a simplified MC response function derived from fits to MC events is performed. Though out-of-the box solutions to MC tuning exist, uncertainties are usually treated as uncorrelated. In this talk, MC tuning using a Bayesian approach will be discussed. The EFTfitter tool is used for fitting, which enables the implementation of correlations for different sources of uncertainties. First results using this method on a MC tune will be presented.