Abstract
The last few years have been witness to a proliferation of new results concerning heavy exotic hadrons. Experimentally, many new signals have been discovered that could be pointing towards the existence of tetraquarks, pentaquarks, and other exotic configurations of quarks and gluons. Theoretically, advances in lattice field theory techniques place us at the cusp of understanding complex coupled-channel phenomena, modelling grows more sophisticated, and effective field theories are being applied to an ever greater range of situations. It is thus an opportune time to evaluate the status of the field. In the following, a series of high priority experimental and theoretical issues concerning heavy exotic hadrons is presented.
Highlights
In 2007 the Belle Collaboration claimed the discovery of the Z(4430)
A compelling and unified understanding of the new states has not yet emerged, and the gap between theory and experiment remains a major deficiency in our current level of understanding of elementary particle physics
We suggest that detailed lattice studies of the QQmass spectrum as a function of light quark masses for masses in a range between their physical values and ≈ 2 × ΛQCD will give much insight into the effects of coupling to decay channels in a model independent way
Summary
In 2007 the Belle Collaboration claimed the discovery of the Z(4430). This state attracted considerable attention because it is charged and couples to charmonium, implying that the most economical interpretation of its quark content is ccud. A compelling and unified understanding of the new states has not yet emerged, and the gap between theory and experiment remains a major deficiency in our current level of understanding of elementary particle physics This gap has its roots in the famously difficult problem of solving QCD in its many-body, strongly interacting, relativistic regime. The PANDA experiment at FAIR is expected to start taking data in 2019; amongst its goals is the exploration of charmonium hybrids and other exotic states. In view of this situation, a workshop was convened at the Institute of Nuclear Theory, Seattle, with the aim of assessing the status of the field and drawing up a short list of questions that have the potential to move the field forward. The emphasis is on smoothing the interaction between theorists and experimental collaborations with the hope of drawing on the strengths of both communities
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