Bound states in gauge theories, from QED to QCD

Who: Paul Hoyer (University of Helsinki)
When: Wednesday, February 11, 2015 at 11:00
Friday, February 13, 2015 at 11:00
Wednesday, February 18, 2015 at 11:00

Where: The CP³ meeting room

Perturbative methods allow accurate calculations of QED bound states (atoms). Hadrons have atom-like features, even though their quark and gluon constituents are highly relativistic and confined. The possibility that analytic Hamiltonian methods may be useful also for QCD bound states merits careful attention. There is a tantalizing possibility that confinement is described by a classical gauge field (Born approximation), with loop corrections being perturbatively calculable. The \(A^0\) potential of mesons is linear when the boundary condition on the classical solutions of Gauss’ law is given by \(\Lambda_{QCD}\).

Bound states are spatially extended objects which transform non-trivially under boosts (c.f. the classical Lorentz contraction). Relativistic dynamics involves pair creation, giving sea quark distributions. The Born level bound states also feature parton – hadron duality. Scattering amplitudes are defined using the bound states as zeroth order “in” and “out” states of the perturbative expansion.

Previous lecture notes can be found at http://arxiv.org/abs/1402.5005 and a summary of results at http://arxiv.org/abs/1409.4703 .

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