Phenomenological constraints on the Jaffe-Wilczek model of pentaquarks

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.074023· OSTI ID:20705347

Cohen, Thomas D ^[1]

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1. Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)

A model recently introduced by Jaffe and Wilczek based on the quarks being dynamically bound into diquarks has been used to predict that the recently observed exotic baryons (pentaquarks) fall into a nearly ideally mixed combination of the 8 and 10-bar representations of SU(3) flavor. The model predicts two states with nucleon quantum numbers which have tentatively been identified with the N*(1440) and the N*(1710). This paper examines the viability of this model by focusing on the decay width of the nucleon members of the multiplet. An inequality relating the partial widths of these nucleon states in the {pi}+nucleon channel to the width of the {theta}{sup +} is derived for this model assuming ideal mixing and that the only significant exact SU(3) symmetry violations are the result of ideal mixing, threshold effects, and the masses of pseudo-Goldstone bosons. This inequality is badly violated if the states in the multiplet are the N*(1440) and the N*(1710) and if the recent bounds extracted for the {theta}{sup +} width are reliable. Thus, the model appears to require a scenario with the existence of at least one presently unknown resonance with nucleon quantum numbers.

• OSTI ID: 20705347
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 70; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FLAVOR MODEL
GOLDSTONE BOSONS
HYPERONS
INTERMEDIATE BOSONS
N BARYONS
NUCLEONS
PARTICLE DECAY
PARTICLE WIDTHS
QUANTUM NUMBERS
QUARKS
RESONANCE PARTICLES
REST MASS
SU-3 GROUPS