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[PAST EVENT] Physics Colloquium - Eichmann
March 3, 2016
4pm - 5pm
Abstract:
Quarks and gluons are the fundamental building blocks of visible matter, yet we cannot observe them because they are confined inside hadrons. In light of ongoing experimental advances, the theoretical description of hadrons within Quantum Chromodynamics (QCD) still poses an enormous challenge. To name a few questions: what is the nature of baryon resonances? Do tetraquarks and pentaquarks exist and if yes, how should we interpret them? Can we describe nucleon form factors, polarizabilities, or electroproduction amplitudes from the level of quarks and gluons, and how is such a description related to effective field theories? What is the QCD contribution to the anomalous magnetic moment of the muon? And is it possible to understand nuclei from the fundamental interactions in QCD?
Here I will present an approach employing Dyson-Schwinger, Bethe-Salpeter and Faddeev equations, whose basic promise is to calculate hadron properties from the nonperturbative structure of the underlying Green functions in QCD – the quark and gluon propagators, quark-gluon vertex etc. I will discuss the basic ideas and highlight some recent progress that has been made regarding the spectrum of mesons and baryons, tetraquarks, nucleon and nucleon resonance form factors, Compton scattering, and the muon g-2 problem.
Quarks and gluons are the fundamental building blocks of visible matter, yet we cannot observe them because they are confined inside hadrons. In light of ongoing experimental advances, the theoretical description of hadrons within Quantum Chromodynamics (QCD) still poses an enormous challenge. To name a few questions: what is the nature of baryon resonances? Do tetraquarks and pentaquarks exist and if yes, how should we interpret them? Can we describe nucleon form factors, polarizabilities, or electroproduction amplitudes from the level of quarks and gluons, and how is such a description related to effective field theories? What is the QCD contribution to the anomalous magnetic moment of the muon? And is it possible to understand nuclei from the fundamental interactions in QCD?
Here I will present an approach employing Dyson-Schwinger, Bethe-Salpeter and Faddeev equations, whose basic promise is to calculate hadron properties from the nonperturbative structure of the underlying Green functions in QCD – the quark and gluon propagators, quark-gluon vertex etc. I will discuss the basic ideas and highlight some recent progress that has been made regarding the spectrum of mesons and baryons, tetraquarks, nucleon and nucleon resonance form factors, Compton scattering, and the muon g-2 problem.