Pentaquark decay width in QCD sum rules

Journal Article · Mon Aug 01 00:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.034003· OSTI ID:20711211

Eidemueller, M ^[1]; Navarra, F S; Nielsen, M; Rodrigues da Silva, R Rodrigues ^[1]

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1. Instituto de Fisica, Universidade de Sao Paulo, C. P. 66318, 05315-970 Sao Paulo, SP (Brazil)

In a diquark-diquark-antiquark picture of the pentaquark we study the decay {theta}{yields}K{sup +}n within the framework of QCD sum rules. After evaluation of the relevant three-point function, we extract the coupling g{sub {theta}}{sub nK} which is directly related to the pentaquark width. Restricting the decay diagrams to those with color exchange between the mesonlike and baryonlike clusters reduces the coupling constant by a factor of 4. Whereas a small decay width might be possible for a positive parity pentaquark, it seems difficult to explain the measured width for a pentaquark with negative parity.

• OSTI ID: 20711211
• Journal Information: Physical Review. D, Particles Fields, Vol. 72, Issue 3; Other Information: DOI: 10.1103/PhysRevD.72.034003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLOR MODEL
COUPLING
COUPLING CONSTANTS
FEYNMAN DIAGRAM
HYPERONS
KAONS PLUS
NEUTRONS
PARITY
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE WIDTHS
QUANTUM CHROMODYNAMICS
SUM RULES