Christian Bauer, LBNL

Christian Bauer

Email: cwbauer@lbl.gov

Tel:      510-486-7773

Fax:     510-486-6808

Office: 50A-5123

Biography

Christian Bauer received his undergraduate education in Karlsruhe, Germany, and his PhD from the University of Toronto under Michael Luke. After graduating in 2000, he took a postdoc position at UC San Diego. In 2003 he moved to Caltech as a McCone senior research fellow and joined the LBNL theory group in 2005 as a Divisional Fellow to LBNL. Since 2006 he has been Senior Staff Scientist. In 2005 he received an Outstanding Junior Investigator award, and in 2010 an Early Career Award from the Department of Energy. In 2010 he was the recipient of the Presidential Early Career Award.

Research interests

Much of my research in the past has focused on the development of novel calculational techniques to increase our ability to make precise predictions in the standard model.Effective field theories are a wonderful tool to work in realistic situations, where widely separated scales make perturbation theory slowly converging, or where non-perturbative effects become important.

One of my  major accomplishments is the development of Soft-collinear effective theory (SCET), which has been widely used in B physics in the past, and is now applied with great success in the LHC era.

Much of the development in the Monte Carlo community over the past decade has been to improve the accuracy of event generators at fixed order. This has led to fully exclusive simulations, which for inclusive enough distributions make predictions at next-to-leading order (NLO). These programs are used extensively by the LHC experiments. One of the main differences of the GENEVA Monte Carlo compared to any other event generators currently on the market or under development, is that GENEVA does not only include higher fixed order accuracy, but higher logarithmic accuracy as well. Many high profile analyses such as $H \to WW$ require jet vetoes to control the backgrounds, and higher logarithmic resummation has been shown to be of crucial importance to reduce theoretical uncertainties to a level comparable with experimental uncertainties. GENEVA will therefore be of vital importance to provide fully exclusive predictions in such restricted regions of phase space. An automatic by-product of this higher logarithmic resummation is NLO accuracy of different multiplicities, and even NNLO accuracy, something many groups strive to achieve in a general setting.

A major feature of GENEVA is that it completely separates the perturbative calculation from the algorithmic parton shower. This allows all theoretical improvements to be handled directly using perturbative QCD, without having to take into account constraints from the parton shower algorithms. This will in the future allow groups with no knowledge in parton showers to contribute perturbative calculations to GENEVA, similar in spirit to the Powheg Box~(\href{http://arxiv.org/abs/arXiv:1002.2581}{1002.2581}). By clearly separating the perturbative from the nonpeturbative physics also allows to set state of the art perturbative from both resummation and fixed order perturbation theory. In GENEVA, uncertainties are provided on an event-by-event basis.

Selected publications