München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 11: QCD (Theorie) 1
T 11.3: Vortrag
Montag, 9. März 2009, 17:30–17:45, M109
Towards NLO in Sherpa - A Status Report — Jennifer Archibald1, Tanju Gleisberg2, Stefan Hoeche3, Frank Krauss1, •Marek Schoenherr4, Steffen Schumann5, Frank Siegert1, and Jan Winter6 — 1Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, UK — 2Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309, USA — 3Institut für Theoretische Physik, Universität Zürich, CH-8057 Zürich, Switzerland — 4Institut für Kern- und Teilchenphysik, TU Dresden, D-01062 Dresden, Germany — 5Institut für Theoretische Physik, Universität Heidelberg, D-69120, Heidelberg, Germany — 6Fermi National Accelerator Laboratory, Batavia, IL 60510, USA
The Sherpa Monte Carlo Event Generator is a fully equipped tool for event generation for collider experiments. Although achieving a high level of flexibility by using automated tree-level matrix element generators for the hard interaction and an automated way of combining multiple multileg matrix elements with parton showers via the CKKW method, the accuracy is essentially limited to LO+NLL. Therefore, the next step is to extent the framework for computations at NLO accuracy. While automatic generation of dipole subtraction terms is already available the last missing piece are the one-loop diagrams, which cannot be calculated automatically by any publically available tool yet. Further, the parton showers need to be attached in a consistent way, suitable also for multileg matching. In the talk a short review of the status of the framework for unweighted event generation at NLO+NLL accuracy will be given.