Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 29: QCD II

T 29.7: Vortrag

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

New developments in event generator tuning techniques — •Holger Schulz1, Andy Buckley2, Hendrik Hoeth3, Heiko Lacker1, and Jan Eike von Seggern11Humboldt University, Berlin — 2University of Edinburgh, UK — 3IPPP Durham, UK

Data analyses in hadron collider physics depend on background simulations performed by Monte Carlo (MC) event generators. However, calculational limitations and non-perturbative effects in strong interactions require approximate models with adjustable parameters. In fact, we need to simultaneously adjust ("tune") many phenomenological parameters in a high-dimensional parameter-space in order to make the MC generator predictions fit the data.

I will present extensions and improvements of the systematic approach to MC tuning, called PROFESSOR (PROcedure For Estimating SyStematic errORs), whose key idea is to construct a fast analytic model of a MC generator response under parameter variations which can then be easily fitted to data. Among the improvements are a robust estimate of tuning uncertainties as well as a graphical user interface that allows for interactive exploration of the behaviour of observables under shifts in parameter space.

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