2009 Physics Events

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William Briscoe
David Ireland
Maxim Polyakov
Igor Strakovsky
Daniel Watts

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Daniel Watts
University of Edinburgh
TEL: 0131 650 5286

2009 Physics Events - Edinburgh - Scotland

Narrow Nucleon Resonances:
Predictions, Evidences, Perspectives
June 8 - 10

S C O P E

The first statement on possible existence of a narrow nucleon resonance near 1680 MeV was based on the π Ν Partial Wave Analysis, though it suggested very small coupling with the π Ν channel. Then direct experimental evidences for the narrow bump in this mass area have been reported in the η photoproduction by three independent groups, first by GRAAL, and somewhat later by CB-ELSA and LNS.

The resonance interpretation imply unfamiliar features: a small total width (< 25 MeV), very small π Ν coupling, and strong isotopic asymmetry of photocoupling (production off neutron at least an order higher than off proton). These properties are very similar to those predicted for the non-strange member of the exotic anti-decuplet.

Alternative explanations of the observed bumps in terms of interference of known nucleon resonance have been suggested as well. It seems that, despite intensive studies of baryon spectroscopy world wide, we may have earlier missed a narrow nucleon resonance with mass around 1680 - 1690 MeV.

Therefore, the situation is worth a profound discussion, which may clarify the present status and suggest new directions for both experimental and theoretical investigations.

D I S C U S S I O N Q U E S T I O N S

*	Can the familiar physics (without narrow baryons) suggest a consistent fit to recently observed structures in γN→ηN.?
*	Do we have any reasons to expect narrow (i.e., Γ<Γ_Δ) non-strange baryonic states (Nucleon- or Delta-like) having non-exotic nature?
*	Could we consider any other reactions (different from γN→ηN) to look for such narrow non-strange baryon?
*	Do we need exotica (baryonic and/or mesonic), or Why we are looking for it? Could we leave exotica alone and forget about it?
*	Might exotica, if it exists, require revising the constituent quark model?
*	May the Chiral Soliton Approach present an adequate model for complete QCD description of baryons?

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