HEP-theory-staff – NCSR DEMOKRITOS Institute of Nuclear and Particle Physics

27 January 2024

Giuseppe Bevilacqua

Dr Giuseppe Bevilacqua obtained his PhD from the University of Torino. He worked as postdoctoral associate and research fellow at the NCSR “Demokritos”, the RWTH Aachen University, the INFN Laboratories at Frascati and the University of Debrecen. He became staff at NCSR Demokritos in 2025 (Researcher grade C). His research activity is set in the context of High Energy Theory, with a solid background in computational physics and precision phenomenology at particle colliders. A distinctive feature of his work is the balance between developing computational tools, automation and practical applications to LHC phenomenology, with a special and continuous interest for Top Quark physics. He has been for many years developing and improving the HELAC-NLO Monte Carlo generator. He also worked to the construction and implementation of subtraction schemes for the computation of real-radiation corrections. He is co-author of several analyses of LHC processes based on state-of-the-art NLO calculations in the Standard Model. He has collaborated with experimental groups (ATLAS, CMS) by delivering dedicated theory predictions and assessing the dominant uncertainties. More recently he expanded his research interests towards BSM phenomenology, with special focus on Effective Field Theories (SMEFT) and their impact on the phenomenology of Top Quark production at the LHC. In parallel to that, he is collaborating with Dr Papadopoulos (INPP) to the goal of extending the HELAC framework to two-loop amplitude calculations while developing a method for two-loop amplitude reduction at integrand level. A full publication list can be found in Inspire http://inspirehep.net/author/profile/G.Bevilacqua.1]. Selected publications: Bevilacqua, D. Canko, C.G. Papadopoulos, A. Spourdalakis, "Towards numerical two-loop integrand reduction", JHEP 11 (2025) 069, https://link.springer.com/article/10.1007/JHEP11(2025)069 Bevilacqua, M. Lupattelli, D. Stremmer and M. Worek, “Study of additional jet activity in top quark pair production and decay at the LHC”, Phys. Rev. D 107 (2023) 114027,https://journals.aps.org/prd/abstract/10.1103/PhysRevD.107.114027 Bevilacqua, H.Y. Bi, H.B. Hartanto, M.Kraus, M. Lupattelli and M. Worek, “ttbb at the LHC: on the size of corrections and b-jet definitions”, JHEP 08 (2021) 008, https://link.springer.com/article/10.1007/JHEP08(2021)008 Bevilacqua, H.B. Hartanto, M. Kraus, T. Weber and M. Worek, “Off-shell vs on-shell modelling of top quarks in photon associated production”, JHEP 03 (2020) 154, https://link.springer.com/article/10.1007/JHEP03(2020)154 Bevilacqua, M. Czakon, M. Kubocz and M. Worek, “Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD”, JHEP 10 (2013) 204, https://link.springer.com/article/10.1007/JHEP10(2013)204 Bevilacqua, M. Czakon, M.V. Garzelli, A. Van Hameren, A. Kardos, C.G. Papadopoulos, R. Pittau and M. Worek, “HELAC-NLO”, Comput.Phys.Commun. 184 (2013) 986-997, https://www.sciencedirect.com/science/article/pii/S0010465512003761?via%3Dihub

23 May 2019

Costas Papadopoulos

Dr. Costas Papadopoulos is currently Director of Research at the Institute of Nuclear and Particle Physics, NCSR “DEMOKRITOS”. He served as research fellow, associate researcher or distinguished visiting scientist at CERN, the University of Durham, ETH-Zurich and the University of Debrecen. His research work covers a large area of theoretical high-energy physics with emphasis to particle physics phenomenology. He is the author of more than 150 publications, in International refereed Journals and conference proceedings. According to the INSPIRE database there are more than 14,000 citations on his published work (h-index 50). Major achievements include: the development of recursive equation approach to scattering amplitudes calculation and the resulting HELAC-PHEGAS computational system; the establishment of the OPP method to calculate virtual one-loop corrections along with the HELAC-NLO framework for arbitrary NLO QCD calculations; the SDE approach to multi-loop calculations. These novel methods and tools allow the detailed study of arbitrary scattering process and played, play and will play a crucial role in the physics analysis of large-scale experiments like LEP and LHC. He has participated, as scientist in charge, in more than 25 research projects funded by the European Union and the Greek General Secretariat for Research and Technology. He has also acted as the coordinator of one of the largest collaborations on theoretical particle physics in Europe, the HEPTOOLS Network that included 17 research teams, from 16 Research centers and 47 Universities worldwide. He has supervised or co-supervised the PhD work of more than 20 students and the post-doctoral research of 9 researchers. He has participated in more than 110 international conferences and workshops and has been invited in more than 30 Universities and research Institutes worldwide.

Full CV can be found here Five most important publications (INSPIRE, 15/2/2022):

Reducing full one-loop amplitudes to scalar integrals at the integrand level

Published in: Nucl.Phys.B 763 (2007), 147-169. [Cited 737 times]

HELAC-NLO

Published in: Comput.Phys. Commun. 184 (2013), 986-997. [Cited 309 times]

HELAC: A Package to compute electroweak helicity amplitudes

Published in: Comput.Phys.Commun. 132 (2000), 306-315. [Cited 278 times]

Simplified differential equations approach for Master Integrals

Published in: JHEP 07 (2014), 088. [Cited 67 times]

Cuts of Feynman Integrals in Baikov representation

Published in: JHEP 04 (2017), 083. [Cited 86 times] For up-to-date information click here