Invited Seminars

IIHE invited seminar: New jet taggers and algorithms as tools for SM and BSM physics at CMS

by Dr Loukas Gouskos (CERN)

Jean Sacton Seminar room (1G003) (IIHE (ULB-VUB))

Jean Sacton Seminar room (1G003)



Abstract:Jet algorithms are at the heart of every measurement and search for physics beyond the standard model with quarks and gluons in the final state. Beyond classical jet algorithms used to estimate the momentum of hard quarks or gluons initiating a shower of hadrons, a large variety of jet techniques are used by CMS to identify the objects initiating jets. Through the study of jet constituent properties, jets originating from light quarks, heavy quarks, gluons, W/Z/Higgs bosons and pileup interactions can be discriminated. First algorithms were developed and validated in LHC Run 1. Significantly more advanced techniques making use of machine learning have recently been introduced for analyzing the LHC Run 2 dataset. This talk will introduce recently developed jet identification tools and discuss recent results in Higgs physics and in searches for physics beyond the standard model making use of these new techniques.

Short bio: Dr. Gouskos obtained his PhD in 2014 at the University of Athens, Greece, working on searches for Supersymmetry (SUSY) [inclusive and targeted searches for Natural SUSY], as well as on the CMS event description focusing on the Missing Transverse energy (MET) reconstruction. Afterwards he  joined University of California, Santa Barbara (UCSB) as a Postdoctoral Fellow and  continued searching for supersymmetric signals (top squarks). He also extended his interest in measurements of the Higgs boson properties (first H->cc search in CMS). In parallel, he worked on the event reconstruction, focusing on MET and the development of jet identification (tagging) tools using Machine Learning techniques. In 2019, he joined the CERN group as a Senior Research Fellow. He continues working in Higgs physics and Jet Identification methods, and  joined the CMS High Granularity Calorimeter upgrade program for High-Luminosity LHC.  He had and has several responsibilities within the CMS collaboration: CMS Physics officer responsible for physics objects groups (Cross-POG) (2020–present), Coordinator [on behalf of CMS] in the Inter-Experimental ML Working Group (2019-2020), Co-Coordinator of the combination of the CMS SUSY analyses towards LHC Run 2 (2018-2019), Co-Convener of the missing transverse energy group (2016–2018) 

Zoom meeting:
Meeting ID: 863 0612 6641
Passcode: !!HESem


Organized by

Ioana Maris & Steven Lowette