Title: Possible Future Circular Colliders

Speaker: Prof.John Ellis（UCL）

Moderator: Prof. LI Haibo

Time: 14:00 PM, April 30

Place: Room C305, IHEP Main Building

Abstract：

An international team coordinated by CERN is considering large circular colliders as possible options to follow the LHC, including a high-intensity e+ e- collider and a 100 TeV pp collider. In this talk I will discuss the physics motivations and capabilities of such machines for Higgs physics, precision measurements and discoveries of new heavy particles such as dark matter.

About the speaker：

I am a theoretical physicist with research interests in particle physics, astrophysics, cosmology and quantum gravity. The discovery of the gluon by experimental teams at DESY in 1979 was based on an idea I published in a paper in 1976 and suggested to them. In 1978 I used a grand unified theory to predict the mass of the bottom quark, and in 1989 I used precision electroweak data to predict the mass of the top quark. I have pioneered phenomenological studies of the Higgs boson (1976), supersymmetry and dark matter (1983), string models (1988) and quantum gravity (1997). Most of my research work has been directly related to experiment, and I frequently co-author scientific papers with experimental authors. Much of my research work also concerns the prospects for future accelerators such as LEP and the LHC. I have been a frequent contributor to studies of their physics capabilities, writing the first survey of possible LEP physics in 1976 and making the first survey of possible beyond the Standard Model physics at the LHC in 1984. The interface between particle physics and cosmology has also been one of my active research interests for many years. I am the author of nearly 900 scientific papers, with over 50,000 citations in the SLAC Spires database, including three papers with over 1000 citations, eight more papers with over 500 citations each and 139 other papers with over 100 citations each, for an h-index of 121.