Wednesday 13 April 2016 

Speaker: Alexander Schmidt (Hamburg University)


Title: "Jet substructure in CMS: methods and applications in searches for new physics" 

Abstract: The direct search for physics beyond the standard model (BSM) is the primary task of the ATLAS and CMS experiments at the LHC.  This search was not yet successful. The currently ongoing Run-II of the LHC represents a unique chance to discover BSM particles which are predicted by a variety of models that are trying to explain the open questions of particle physics. One striking feature common to many of these new models is that the couplings with third-generation quarks are enhanced. This results in final states containing b quarks, vector bosons, Higgs bosons and top quarks that can have significant Lorentz boosts, so that their individual decay products often overlap and merge. Such "boosted topologies" can be exploited thanks to dedicated reconstruction algorithms that were developed and became well established in the context of the analyses of Run-1 data. These algorithms are even more important in Run-2 because of the increased energy. In this talk the methods for jet substructure analysis in CMS will be reviewed and their applications in searches for new physics will be discussed.