Bonn 2010 – scientific programme
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T: Fachverband Teilchenphysik
T 11: QCD (Theorie) II
T 11.5: Talk
Tuesday, March 16, 2010, 17:45–18:00, HG XVI
Monte-Carlo simulation of deep-inelastic scattering with the Sherpa event generator — Tancredi Carli1, Thomas Gehrmann2, and •Stefan Hoeche2 — 1CERN, Department of Physics, CH-1211 Genève 23, Schweiz — 2Institut für theoretische Physik, Universität Zürich, CH-8057 Zürich, Schweiz
A characteristic feature of deep-inelastic scattering is the nearly arbitrary scale Q2, 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.