2- & 3-body dynamics of excited states

by Dr Maxim Mai (George Washington University, Washington, D.C., USA)

Monday 18 Jun 2018, 14:15 → 16:45 Europe/Berlin

3344 (TUM - Physics Department - Garching)

The phenomenology of strong interaction reveals a rich spectrum of excited states, many of which couple dominantly to e.g. 2 or 3 asymptotically stable states, manifesting themselves in analytic properties of the corresponding S-Matrix.  
In this talk, I will present how unitarity and connectedness structure of matrix elements can be used as guiding principles for the construction of 2- and 3-body scattering amplitudes. Furthermore, it will be shown, how a parameterization of the latter in terms of the isobars leads to a simple form of the 3-body quantization condition for the analysis of the Lattice QCD results.
These theoretical results will be related to specific examples interconnecting contemporary experimental and Lattice QCD results, such as: *Insights into properties of the f0(500) driven by recent Lattice QCD results; *New puzzles in Kbar-N-scattering, related to the
Lambda(1405) and Sigma(1385) resonances; 
Ongoing investigations of a1(1260), a1(1420), etc. channels.