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Prof Guido Martinelli: three roads to find new physics beyond the standard model

2020-03-14


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Guest Introduction

Prof Guido Martinelli graduated in Physics in 1975 under the supervision of Nicola Cabibbo and Giorgio Parisi. In the years 1977-1987, he was researcher at the Frascati National Laboratories of the National Institute of Nuclear Physics (INFN); from 1988, he was Associate Professor of Theoretical Physics at the University La Sapienza of Rome where he became Full Professor in 1990. 

Prof Martinelli was Director of the Physics Department of  La Sapienza (2001-2007), President of the National Committee for Theoretical Physics of INFN and  Director (President) of the International School for Advanced Studies (SISSA) in Trieste (2010-2015). Since January 2015 he is Member of the CERN Scientific Policy Committee. He is member of the Accademia Nazionale dei Lincei. 

The scientific interests of Prof. Martinelli are focused on elementary particle physics and phenomenology. He is author of more than 200 papers in international journals that have received about 21000 citations (InSpires h-factor 75). In 2010 he obtained a grant from the European Research Council. He got several times grants of the Italian Ministry of Education (called PRIN).


Lecture Detail

In this lecture, Pro.Martinelli firstly discussed the reason for physics beyond the standard model: the neutrinos’ mass, dark matter and matter-antimatter asymmetry. Then he introduced three roads to find new physics beyond the standard model: energy frontier about electro-weak symmetry breaking (Higgs physics), flavor physics and dark matter.

Regarding the Higgs particle, Pro.Martinelli introduced their main properties, including mass and spin. He then discussed the importance of the Higgs particle in ensuring the unitary properties of the theory with the Feynman diagrams. He also pointed out that more accurate measurements of the Higgs particle in the future could lead to the discovery of new physics.

Afterwards, Pro.Martinelli elaborated the dark matter. The galactic rotation curves, gravitational lenses,  bullet clusters, and many other astrophysical evidences suggest that 85% of the matter in our universe has not yet been discovered, which has no electricity, no light and basically interacts with other ordinary matter only through gravity. Then he focused the WIMPs, the most important dark matter candidates, whose stability is ensured by their appreciable coupling with the standard model particles and their appropriate symmetry. He also introduced the properties of some candidates: axions, neutrinos.

Finally, Pro.Martinelli argued that the collider is still the most efficient way to discover new physics. He also introduced several planned colliders (FCC, ILC, CEPC) and compared their main parameters (luminosity, dipole field, collision energy, etc.).


Q&A Session

After the seminar, Prof.Martinelli met the students for a face to face discussion on the future perspectives of scientific research in particle physics. In this Q&A Session, students asked some question regarding the Lepton Flavour Universality Violation and the Gauge Field Symmetry, and Pro. Martinelli gave a detailed answer one by one.

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A student is exchanging ideas with prof. Martinelli


Finally, Prof. Leonardo Modesto and Prof. Fabio Briscese presented the honorary certificate of SUSTech to Prof. Guido Martinelli as a perfect ending of the lecture.

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Prof. Leonardo Modesto, Prof. Guido Martinelli and Prof. Fabio Briscese (from left to right)