[PAST EVENT] Physics Colloquium - Jeremy Green
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- Open to the public
Jeremy Green, Deutsches Eletronen-Synchrotron, Germany, Title of talk: Calculating the quark substructure of the proton and neutron
Abstract: Protons and neutrons (together called nucleons) are the basic building blocks of ordinary matter, along with electrons. Unlike electrons, they are not fundamental particles in the Standard Model of particle physics ? they are bound states of quarks and gluons interacting as described by the theory of quantum chromodynamics (QCD). Because QCD is strongly coupled at low energies, it is difficult to determine the structure of nucleons from first principles. This can be done using lattice QCD: a formulation of QCD suitable for performing calculations on supercomputers, which provides a way to calculate nucleon structure with controllable uncertainties.
In this talk I will discuss some basic properties of nucleons such as the proton radius (which is the subject of a large disagreement between different experiments), and how they can be computed using lattice QCD. I will give an overview of the current status of these calculations, and present some progress in understanding the role that strange quarks play in nucleons.