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T: Fachverband Teilchenphysik

T 8: Eingeladene Vorträge 3

T 8.3: Eingeladener Vortrag

Donnerstag, 1. März 2012, 15:10–15:40, ZHG 011

Precision event generation for the LHC — •Stefan Höche — SLAC National Accelerator Laboratory, Menlo Park, USA

In order to maximize the discovery potential of the Large Hadron Collider, precise predictions are needed for a multitude of Standard Model reactions. Signals for new physics may be hidden in overwhelming backgrounds, which have to be controlled in order to find anomalies withstanding detailed scrutiny.

Tremendous progress was made in recent years to improve the theoretical description of these backgrounds using next-to-leading order (NLO) QCD. This talk reviews some of the essential aspects of modern multi-jet NLO calculations and presents results in comparison to recent LHC data.

The need for theoretical predictions at the particle level has spurred the development of so-called matching algorithms, which connect NLO parton-level results and parton showers as part of general-purpose Monte-Carlo event generators. The theoretical challenges of these methods for large jet multiplicity are discussed with particular emphasis on the correct treatment of subleading colour and soft gluon effects.