The Charpak-Ritz Prize 2023 is awarded to Bruno Mansoulié for his contributions to high energy particle physics at hadron colliders in international particle physics collaborations, from the design and realization of the detectors to the physics analyses and his role in the ATLAS collaboration that has led to the discovery of the Higgs boson.
Bruno Mansoulié is an experimental physicist at Université Paris-Saclay, in the Particle Physics division (CEA-IRFU-DPhP). He worked on several generations of hadron collider experiments, from the design and realization of the detectors to the physics analyses. This started at CERN in the 1980’s with the UA2 experiment, with the discovery of the W and Z bosons. In the 1990’s he joined the D0 experiment in Fermilab USA, with the discovery of the top quark. At the same time, he promoted the early LHC project at CERN, and he was involved in the design and construction of the ATLAS experiment, in particular the Liquid Argon Calorimeter, and in the preparation of the physics analyses.
After the start of the LHC operation, he participated to several aspects of the search for the Higgs Boson, which was discovered in 2012 by the ATLAS and CMS experiments. Leading a large group in the ATLAS collaboration, he studied the properties of the new particle. One important aspect of his work is the combination of the observations of the Higgs Boson in different production and decay modes. This combined analysis allows to determine the couplings of the Higgs boson to the other elementary particles of the Standard Model. The specific pattern of these couplings is a characteristic signature of this very special particle and of its role in the theory.
It is specific to note that when working in large-scale multi-national research projects a significant part of Bruno Mansoulié’s work has been performed in collaboration with Swiss researchers at the Universities of Bern and Geneva.
Next to his complex multi-lateral scientific efforts, Bruno Mansoulié has also been actively involved in outreach activities, explaining the latest results from the ATLAS collaboration on Higgs physics to a broad and interested audience. He also wrote books, such as "All physics (almost) in 15 equations" unveiling the cabalistic signs in quantum mechanics, cosmology and particle physics and exposing its full fascination, or "Physics in Crisis: From Multiverses to Fake News".