Confinement between static quarks is a quantum mechanical archetype. Numerical simulations of lattice-regularised QCD exhibit a linear potential at long range between these infinitely heavy sources/sinks of colour charge. This picture has been formalised and made rigorous in effective field theories for heavy-quarkonia, such as nonrelativistic QCD and its variants. Now these heavy-quarkantiquark bound states are becoming a laboratory within which it may be possible that the evolution between perturbative and nonperturbative QCD can be explored systematically within a controlled framework.
The physics of confinement in the light-quark domain, however, is not obviously amenable to such a description. For example, a veracious realisation of dynamical chiral symmetry breaking is impossible in quantum mechanical potential models. Moreover, in the presence of light- (dynamical-) quarks, the breaking of the string that characterises the potential between heavyquarks appears to be an instantaneous process, with delocalised light-quark-antiquark pair production. Thus either no information is to be had about a string between light-quarks, or it does not exist.
This apparently dichotomous nature of confinement means that a description and understanding of radial and angular momentum excitations, and so-called exotic and/or hybrid states in the heavy-quark sector may appear to rest on a completely different foundation than that in the light-quark sector. Common sense says they must be connected but the question as to how is pressing. A picture is needed that is both quantitatively and qualitatively accurate.
The aim of this workshop is to bring together practitioners with expertise in:
- the application of QCD- and symmetry-based models to the spectrum and dynamics of light-quark hadrons, in particular excited states, exotics and hybrids, and extending also to the physics of charm states;
- conjectures and models of confinement in pure-gauge QCD;
- effective field theories for heavy-quarkonium systems;
- the numerical simulations of lattice-regularised QCD in connection with gauge covariant Schwinger functions, topological features, and experimental observables.
Our aim is to encourage these practitioners to elucidate the strengths of, and challenges for, their chosen tools, and foster discussion about the interplay between dynamical quarks and the problem of confinement. This will be the charge given to each of the key participants.
There will be keynote lectures by well-established researchers, about four on each of the mornings of the workshop. Two hours following lunch are set aside for discussion. Participants will then reassemble for coffee before a set of three/four shorter lectures by earlycareer researchers, including senior PhD students.
The workshop will begin on Monday, 12th March, in the morning and end ond Friday, 16th March, in the afternoon.
The following information on the ECT* web site should help you plan your journey to Trento more easily.
Please do not hesitate to contact the organizing committee of the workshop with your comments and questions.
|Universität Regensburg||Gunnar Bali|
|Germany||Institut für Theoretische Physik|
|D-93040 Regensburg, Germany|
|Universität Graz||Andreas Krassnigg|
|Austria||Institut für Physik, Fachbereich Theoretische Physik|
|A-8010 Graz, Austria|
|Argonne National Laboratory||Craig Roberts|
|(Coordinator)||Argonne National Laboratory|
|Argonne, IL 60439, USA|
|Technische Universität Darmstadt||Jochen Wambach|
|Germany||Institut für Kernphysik (Theory)|
|Schlossgartenstr. 9, S2 14 / 416|
|D-64289 Darmstadt, Germany|