Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 59: Extended Higgs models II

T 59.5: Vortrag

Mittwoch, 17. März 2021, 17:00–17:15, Ti

Combined measurements of Effective Field Theories with the ATLAS Experiment — •Carsten Burgard — DESY, Hamburg

The LHC experiments have so far not been able to present discoveries of new physics beyond the Standard Model (SM), be it in the form of Supersymmetry, additional Higgs bosons or other new exotic particles. At present, deeper investigations of the collected data in the form of precision measurements of the most elusive parts of the SM are one of the most promising paths to success in discovering physics beyond the SM. Many analyses in the Higgs sector are progressing from discovery to precision measurement as the dataset grows. Additional statistical precision beyond that can be gained by combining data from different individual analyses, usually focused on specific decay modes. For the measurement of Higgs boson production sections and decay ratios such combinations are well-established, both within ATLAS and across experiments, but a more exciting prospect is the ability to directly measure Wilson coefficients of Effective Field theories from LHC data. A combined simultaneous fit of Wilson coefficients to a subset of ATLAS Higgs data has recently been published. Such a combination could conceivably incorporate not only Higgs boson data, but also measurements of other SM particles and even other experiments. Novel techniques for these types of measurements need to be developed, such as the use of principal component analyses to identify sensitive directions within an EFT model of the measured data, or the combination of unfolded differential fiducial measurements with results using the simplified template cross section method.