München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 29: QCD 3
T 29.9: Vortrag
Donnerstag, 12. März 2009, 18:50–19:05, A017
PROFESSOR: Systematic tuning of Monte Carlo event generators — •Holger Schulz1, Andy Buckley2, Hendrik Hoeth3, Heiko Lacker1, and Jan Eike von Seggern4 — 1Humboldt University, Berlin, Germany — 2Institute for Particle Physics Phenomenology, Durham University, UK — 3Lund University, Sweden — 4Institute for Nuclear and Particle Physics, TU Dresden, Germany
The non-perturbative part of an event in a Monte Carlo event generator is described by certain models that are approximations to the actually happening physics processes. These models comprise a large number of partly strongly correlated and relatively free parameters. In addition, the machinery of attaching perturbative and non-perturbative regimes together is steered by parameters that have no physical meaning.
The quality of the model description can be tested by comparing experimental data with the observables derived from the generated events. So far, the tuning of Monte Carlo event generators was attempted by means of trial and error or enormous computing time. In this talk the software PROFESSOR (PROcedure For Estimating SyStematic errORs) is presented which represents a systematic approach to find optimal parameter values by fitting a parameterisation of the generator's description of observables to high-precision data. Examples of the application to models of fragmentation and the underlying event are being presented.