Dr. Georgios Anagnostou is a a Senior Researcher at the Institute of Nuclear & Particle Physics, NCSR Demokritos, Athens, Greece.
He received his diploma in electrical and computing engineering from NTU Athens and an MSc in telecommunications from Essex University (UK). After working briefly in the private sector he joined the Birmingham University particle physics group. His PhD thesis concerned the measurement of fermion pairs cross-sections and asymmetries for OPAL experiment. He has worked as a postdoctoral researcher in CMS experiment initially at Demokritos (2003-2007) and then at Aachen University (2007-2011). Since 2012, he is a member of the CMS group in the Institute of Nuclear and Particle Physics in Demokritos.
His main interest in experimental particle physics concerns possible BSM signals originating from final states with 2 invisible particles. This kind of signals are predicted by many interesting theories that include invisible dark matter candidates or heavy top partners. Traditionally, missing energy related observables are used in these searches, making signal extraction difficult due to the similarity with the background shape in the tail of the distributions. A new method is proposed to search for these final states based on the mass reconstruction of the two unknown particles. Thus, a bump hunting is possible in the 2-Dimensional mass plane, using as assumption only the event topology. The mass space is ideal for searches as there is no need for training or optimization. It can also be used to give us hints about the nature of possible new physics by constraining the parameters of the model. In collaboration with Dr.S.Beranek (Aachen) and Dr.A.Psallidas (Demokritos) the new method was applied to CMS Run1 data. Initially, known particles such as top pairs were used as a proof of principle. The next step was the search for heavy top partners in a generic topology for anything decaying like dilepton top pairs. This was also the subject of Dr.S.Beranek PhD thesis. The analysis effort is ongoing in Run2, trying to apply the generic method in other interesting topologies. More details can be found on the publications below as well as on this talk (Dark matter Identification Conference, Mainz 2019).
G.Anagnostou, “Searching in 2-Dimensional Mass Space for Final States with 2 Invisible Particles”, e-Print: 2009.10032 [hep-ph].
CMS Collaboration, “Beyond 2 Generations”, EPJ Web Conf. 126, 04001 (2016), DOI https://doi.org/10.1051/epjconf/201612604001
CMS Collaboration, “Search in two-dimensional mass space for T’T’ → W’bW’b in the dilepton final state in proton-proton collisions at √s = 8 TeV”, CMS-PAS-B2G-12-025
CMS Collaboration, “Search for the MSSM Higgs bosons at the LHC”, AIP Conf.Proc. 1078 (2009) 192-194, DOI https://doi.org/10.1063/1.3051905
The LEP Collaborations, the LEP Electroweak Working Group “A combination of preliminary electroweak measurements and constraints on the Standard Model”, CERN-EP-2003-091, LEP-EWWG/2003-02, e-Print: hep-ex/0312023
The Opal Collaboration, “Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion-Pair Production at 189-209 GeV at LEP“, Eur. Phys. J. C 33, 173-212 (2004), DOI https://doi.org/10.1140/epjc/s2004-01595-9
G.Anagnostou, “Fermion Pair physics at LEP2”, Eur. Phys. J. C 33 s700-s702 (2004), DOI https://doi.org/10.1140/epjcd/s2004-03-1622-3
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