Kostas Nikolopoulos obtained his Ph.D. on the ATLAS experiment with the University of Athens (Greece) in 2010. His thesis was awarded Marc Virchaux Prize. Subsequently, he joined the Brookhaven National Laboratory (USA) as a post-doctoral research associate, and since 2012 he joined the University of Birmingham as a Lecturer and Birmingham Fellow. In October 2014, he was elected ATLAS UK Physics coordinator.
Became heavily involved in the H→ZZ*→4l analysis already before data-taking, developing the tools and strategies that were used in the actual data analysis. In Oct 2010 he was appointed convener of the ATLAS H → ZZ group (Higgs boson decays channels involving Z bosons), consisting of more than 100 physicists. His term of office was exceptionally extended (Oct 2011) for an additional year and he led the group in the discovery of Higgs boson-like particle in July 2012. Subsequently, he turned his attention to the study of the properties of the Higgs boson with emphasis on the mass, production rates, and couplings. He introduced analysis categories with topologies sensitive to the Higgs boson production mechanism, and experimental variables that enhanced the sensitivity to coupling properties through multi-observable maximum-likelihood fits. This culminated in several publications establishing the Standard Model-like character of the observed Higgs boson.
Furthermore, he is interested in searches for physics Beyond the Standard Model in the Higgs sector; both through the search for additional Higgs boson and through anomalous decays of the observed Higgs boson. He has led the team that performed the first search for the decay of the Higgs boson to a quarkonium state and a photon (H → J/ψγ and H → Υγ), as well as the previously unobserved analogous decays of the Z boson. This analysis provides first information on the Yukawa coupling of the charm quark.
Kostas is a co-investigator on the Birmingham Particle Physics grant from the Science and Technology Facilities Council (STFC).
In recent years has also received funding in support of his work from the Marie Curie actions and the Durham Institute of Particle Physics Phenomenology.