53. International Winter Meeting on Nuclear Physics

A New Hadron Spectroscopy

30 Jan 2015, 10:50

40m

Bormio, Italy

Extended Contribution Elementary Particle Physics Friday Morning

Speaker

Dr Stephen Lars Olsen (Institute for Basic Science, Daejeon KOREA)

Description

A number of candidate multiquark, quarkonium-like mesons, i.e., mesons with underlying substructures that are more complex than the quark-antiquark prescription that is in the commonly used textbooks, have been observed in e+e- meson factory and high-energy hadron collider experiments. Many of the most recently observed candidate states are electrically charged and have the same spin and parity, namely JP=1+. In this talk I will give an overview of the current experimental situation and identify patterns among the recently discovered JP=1+ states, compare these patterns with expectations from proposed theoretical models and suggest the existence of additional related states that might be accessible at current and future experiments.

Summary

This talk will not cover results from any specific experiments. I expect these to be covered by other, experiment-designated speakers at the meeting. I propose instead to look at patterns among the observed states and compare them to expectations from competing theoretical models, specifically hadron-molecule schemes and QCD-color inspired diquark diantiquark models. These patterns also naturally suggest the existence of additional, as-yet unseen, related states that could be searched for in current experiments such as BESIII, LHCb, CMS and ATLAS or, in future experiments such as BelleII and PANDA.

The talk introduction will include a concise, tutorial-like review of the basic ideas behind the hadron molecule and QCD diquark-diantiquark models for four-quark meson states.

Presentation materials

Slides

Olsen_Bormio2015.pdf