2018 James Chadwick Medal and Prize

Professor Stefan Söldner-Rembold of the University of Manchester for his contributions to pioneering experimental work in high-energy particle physics and his international leadership in Higgs and neutrino physics.

2018 James Chadwick Medal and Prize
© Reidar Hahn/Fermilab

Professor Stefan Söldner-Rembold has led many of the key measurements in particle physics over the past 20 years across experiments at two of the major centres of particle physics – CERN in Switzerland and Fermilab in the US.

He led the D0 experiment from 2009 to 2011 (550 scientists in 18 countries) and, as such, is one of only a handful of UK-based particle physicists to have led such a large collaboration. He led the collaboration in publishing 68 papers, particularly the first paper with evidence of the Higgs boson decaying to b-quarks, which has only recently been matched by measurements at the LHC.

This builds on several years of leadership in the search for the Higgs boson. Stefan was responsible as the physics coordinator of the LEP OPAL experiment for the most stringent limit on Higgs boson production for more than a decade and on D0 for the first exclusions of the Higgs boson around a mass of 160 GeV. He developed the techniques to identify hadronically decaying tau leptons in the context of Higgs searches, which resulted in the most stringent constraints on supersymmetric models at the time, and he led the first search for a doubly-charged Higgs boson at a hadron collider.

He has also made some of the notable first measurements in the area of the strong force Quantum Chromodynamics – particularly the first measurements of the charm-quark content of the photon, a measurement of the strong coupling constant from the photon structure function and the first demonstration that the photon-photon cross section increases with energy.

Rarely for the field where experimentalists tend to specialise in collider or neutrino physics, he has also become a world-leading figure in neutrino physics, having established this as an entirely new research area in Manchester. He has made the most sensitive measurement of the double-beta decay of 150-Nd and has coordinated the international activity to build the core components (APAs) for a liquid argon detector for what will be the world’s largest neutrino experiment – DUNE in South Dakota. He has recently been elected to lead the DUNE Collaboration, which has more than 1000 collaborators from 32 countries.

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