The long road to the LHC

<!--HTML--> Lecture by Lyn Evans Abstract The key to the discovery of the Higgs boson has been the development of particle accelerators at CERN through the years. I will explain how a particle accelerator works and will follow the path from the construction of the Proton Synchrotron in the 1950s to the world’s most powerful colliding beam machine, the Large Hadron Collider. Biography Born in 1945, Lyn Evans has spent his whole career in the field of high energy physics and particle accelerators, participating in all the great projects of CERN. From 1993 he led the team that designed, built and commissioned the LHC. He is presently a visiting professor at Imperial College London and Director of the Linear Collider Collaboration. Among his many honours he is a Fellow of the American Physical Society and a Fellow of the Royal Society. He was awarded a Special Fundamental Physics Prize in 2013 for his contribution to the discovery of the Higgs boson. “Some aspects of physics at CERN (and elsewhere), from the early days to the LHC era.” By Daniel Treille. Abstract I will use stories of various physics breakthroughs to illustrate the major phases of CERN’s activities and results, from the early days to the LHC era, putting them into the general context of global particle physics. Biography 1959: École normale supérieure (Ulm) in Paris 1963: Agrégation de physique 1967: Doctoral thesis in LAL Orsay 1968 – 1969 experiments on e+e– colliding ring ACO in LAL, France 1969: Maître de recherche in CNRS 1976: Indefinite appointment at CERN (research physicist) 1969 – 1973: Experiments at CERN PS 1972 – 1978: Experiments at Omega Spectrometer- Physics Coordinator of the Omega Spectrometer 1978 – 1986: Spokesman of the NA14 and NA14-2 experiments 1979 onwards: Participation to the conception and realization of the Delphi experiment at LEP 1990: Leader of Delphi CERN Group 1996 – 1997: Spokesman of Delphi 1998 – 2000: Coordinator of Delphi LEP200 physics 2000 onwards: Member of the LHC experiment CMS Plenary Rapporteur Talks at six major International Conferences Lectures in many Physics Schools and Workshops Member of scientific and evaluation committees (CERN, DESY (Germany), Portugal, Canada, Spain, France, Belgium, Sweden) 2004-2007 Chair of the IN2P3 Conseil Scientifique, France Plenary Talks for non-specialized audiences (UTLS 2000, EPS 2002, CERN 50 years 2004) About 850 publications in referenced journals Doctor Honoris Causa of Stockholm University in 1996. “The long experimental journey of the Higgs discovery at the LHC” by Peter Jenni Abstract Since 2010, the experiments at the Large Hadron Collider (LHC) have been investigating particle physics at the highest collision energies ever achieved in a laboratory. Following a rich harvest of results for Standard Model physics, the first spectacular discovery by the ATLAS and CMS experiments came in 2012 when they observed a new, heavy particle that was almost certainly the long-awaited Higgs boson. Building up the experimental programme and developing the very sophisticated detectors built and operated by world-wide collaborations represented an incredible scientific and human adventure spanning three decades, and this is only the beginning of a fantastic journey into unchartered physics with the LHC. Biography Former ATLAS Collaboration Spokesperson University of Freiburg (Germany) and CERN (Geneva, Switzerland) Peter Jenni obtained his degree in physics from the University of Bern in 1973 and his doctorate from ETH Zürich in 1976. During 1978/1979, he was a research associate at the Stanford Linear Accelerator Centre (SLAC), USA. He became a CERN research staff physicist in 1980 with the UA2 experiment at the SPS collider. He was a great proponent of the Large Hadron Collider (LHC) right from the beginning in 1984. From 1991 his main activities concentrated on building up an LHC experiment. In 1995, after the ATLAS project was formally approved, he was elected its spokesperson (project leader). He was re-elected several times, and stepped down from this duty in February 2009, retaining however a strong involvement in the operation and the physics of the experiment. Since his retirement from CERN at the end of April 2013, Peter Jenni has been a guest scientist and honorary professor with the Albert-Ludwigs-University Freiburg, Germany. He received or shared, among other honours, the Swiss Greinacher Prize, the Czech Academy of Sciences Ernst Mach Honorary Medal, the German Julius Wess Award, the Special Fundamental Physics Prize (FPP), and the High Energy and Particle Physics Prize of the European Physical Society (EPS). He also received honorary PhD degrees from the Universities of Stockholm and Copenhagen and from the ETHZ.

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