Mainz 2014 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 7: Partonschauer, NLO Matching und MC-Tuning (Theorie+Experiment)
T 7.5: Vortrag
Montag, 24. März 2014, 12:00–12:15, P7
Angular Correlations and Soft Jets as Probes of Parton Showers — •Nadine Fischer1, Stefan Gieseke1, Stefan Kluth2, Christoph Pahl2, Simon Plätzer3, and Peter Skands4 — 1KIT, Institute for Theoretical Physics, D-76128 Karlsruhe — 2Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), D-80805 München — 3DESY Theory Group, D-22607 Hamburg — 4Theoretical Physics, CERN, CH-1211 Geneva 23
Since QCD processes are very dominant in high-energy collisions, the modelling of QCD jets is an important issue for multi-purpose Monte Carlo event generators. Properties such as QCD colour coherence, the destructive interference effect between colour-connected partons, or the emissions of soft jets are implemented in different ways in the existing parton shower algorithms. To compare different shower models, we propose observables which are sensitive to colour coherence and angular ordering or to effective 1 → 3 splitting kernels. We tune the different parton showers in Herwig++, Pythia8 and Vincia and predict distributions for the proposed observables. We present a new measurement of these new observables with data from the OPAL detector and compare the results to our predictions.