# Bonn 2010 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 11: QCD (Theorie) II

### T 11.7: Vortrag

### Dienstag, 16. März 2010, 18:15–18:30, HG XVI

**Systematic tuning of the AHADIC hadronisation model with the Professor framework** — Andy Buckley^{1}, Hendrik Hoeth^{2}, Frank Krauss^{2}, Heiko Lacker^{3}, Holger Schulz^{3}, and •Jan Eike von Seggern^{3} — ^{1}Particle Physics Experiment Group, University of Edinburgh, UK — ^{2}IPPP, University of Durham, UK — ^{3}Institut für Physik, Humboldt Universität zu Berlin, Germany

Monte Carlo (MC) event generators are a well established tool for all parts of particle physics. However, for the simulation of the non-perturbative regime of strong interaction no approach is available that is rigorously based on theory. Therefore, the simulation uses phenomenological models that depend on a large number of relatively free parameters that are partly correlated. To determine these parameters the model description is tuned to fit experimental data. Over the past years the Professor tool-chain was developed to reduce the time consumption and increase both the reproducibility in the MC parameter tuning and the number of observables that can be taken into account.

A crucial part of the non-perturbative regime of the simulation is the translation of partonic states into hadrons. Therefor two approaches have been followed so far: the Lund string model (e.g. like in Pythia), that follows a global strategy, and the cluster model (e.g. like in HERWIG), that treats hadronisation locally. The SHERPA event generator follows the latter approach with the hadronisation model AHADIC. However, its model parameters have not been tuned systematically up to now. In this talk, the SHERPA hadronisation model AHADIC and its tuning with the Professor tools using data from LEP is presented.