Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 69: Strong Interaction / QCD
T 69.2: Vortrag
Donnerstag, 3. April 2025, 16:30–16:45, VG 0.110
Non-perturbative effects in multidimensional dijet and Z+jet production at the LHC — Stefan Gieseke1, Maximilian Horzela2, Manjit Kaur3, Dari Leonardi1, Klaus Rabbertz4, Aayushi Singla3, and •Cedric Verstege4 — 1Institute of Theoretical Physics, Karlsruhe Institute of Technology — 2II. Institute of Physics, Georg-August Universität Göttingen — 3Department of Physics, Panjab University, Chandigarh, India — 4Institute of Experimental Particle Physics, Karlsruhe Institute of Technology,
Comparison of precision LHC data at stable-particle level to the most accurate fixed-order calculations in perturbative QCD requires the latter to be corrected for non-perturbative effects. These effects are studied using Monte-Carlo simulation combining fixed-order predictions with parton showers and non-perturbative models for Underlying Event and hadronization.
The impact of the non-perturbative effects is studied for two well established processes, dijet and Z+jet production. Corresponding measurements may be used for precision determinations of parameters of the SM like the strong coupling constant or the proton structure. Surprising differences of the non-perturbative corrections for both processes in similar 3-dimensional phase spaces are observed. These differences also show a dependence on additional perturbative radiations, showcasing that the naive assumption of a clear differentiation between perturbative calculations and non-perturbative effects does not always hold.
Keywords: non-perturbative; dijet; jet; Z+jet; Underlying Event