Signale und Hintergründe Jenseits führender Ordnung: Phänomenologische Studien für den LHC

• Antragstellerin: Professorin Dr. Malgorzata Worek
• Fachliche Zuordnung: Kern- und Elementarteilchenphysik, Quantenmechanik, Relativitätstheorie, Felder
• Förderung: Förderung von 2013 bis 2016
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 228519547

The Large Hadron Collider (LHC), with its two main multipurpose detectors ATLAS and CMS, is the experimental project that dominates present particle physics and will likely dominate the next 20-25 years. With the successful start of collisions at 7 TeV, the LHC has put another milestone towards a thorough exploration of the Terascale. The large energy available has opened many multiparticle channels that are now widely scrutinized. The immense amount of available phasespace leads to the production and identification of final states with 4 or more QCD jets together with isolated leptons. These multi-particle events hide or strongly modify all possible signals of physics beyond the Standard Model (SM). In view of a correct interpretation of the signals of new physics, which might be extracted from data, it is of considerable interest to reduce our theoretical uncertainty for the physical processes under study, especially when large QCD backgrounds are involved. In this respect, the need for next-to-leading-order (NLO) corrections for the LHC is unquestionable. The purpose of this project is to provide an efficient numerical evaluation framework for multi-particle final states at NLO QCD through further development and improvement of the publicly available Monte Carlo (MC) program HELAC-NLO of which I am acoauthor. Such fully flexible and general purpose MC program can be of great importance for the experimental groups while performing comparisons between measured data and theoretical models. In the next step, with the help of the developed MC package, phenomenological aspects of the SM at the LHC will be studied. Among others, I plan to concentrate on studies of the top quark at the LHC. I will concentrate on the calculation of NLO QCD corrections to the final states with 4(5) particles, which are at the current technical frontier. Just to give an example I will calculate NLO QCD corrections to the WWbbj production, which gives a complete NLO description of the production of top anti-top pairs with an additional jet, including interference and off-shell effects as well as non-resonance contributions. As a final matter, I would like to extend HELAC-NLO by matching with parton shower programs like PYTHIA and HERWIG via the POWHEG BOX framework. It allows for interfacing fixed order NLO QCD calculations with all modern showerMonte Carlo programs in order to obtain realistic hadron level events.

• DFG-Verfahren: Sachbeihilfen