# Bonn 2010 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 11: QCD (Theorie) II

### T 11.5: Vortrag

### Dienstag, 16. März 2010, 17:45–18:00, HG XVI

**Monte-Carlo simulation of deep-inelastic scattering with the Sherpa event generator** — Tancredi Carli^{1}, Thomas Gehrmann^{2}, and •Stefan Hoeche^{2} — ^{1}CERN, Department of Physics, CH-1211 Genève 23, Schweiz — ^{2}Institut für theoretische Physik, Universität Zürich, CH-8057 Zürich, Schweiz

A characteristic feature of deep-inelastic scattering is the nearly arbitrary scale *Q*^{2}, at which the structure of the proton can be probed by the virtual photon. While this presents an excellent opportunity for *measuring* the QCD dynamics of the process, it also constitutes the main obstacle for *simulating* it with Monte Carlo event generators. The problems to be solved in this context are connected to the definition of initial conditions for the parton-shower evolution, which usually imply a severe restriction of the phase space for extra parton radiation.

We present an extension of a recently introduced method for merging truncated parton showers with higher order tree-level matrix elements, which is capable to solve these problems in a generic way. Hadronic final states in deep-inelastic scattering are analysed in detail and the corresponding results are compared to HERA data. Theoretical uncertainties of the approach are discussed. We outline how the procedure can be generalised to simulate parton radiation in general low-mass final states at hadron-colliders.