6533b834fe1ef96bd129cd73
RESEARCH PRODUCT
Pentaquark decay width in QCD sum rules
Fernando Silveira NavarraMarkus EidemüllerMarkus EidemüllerR. Rodrigues Da SilvaMarina Nielsensubject
Coupling constantQuantum chromodynamicsPhysicsNuclear and High Energy PhysicsQCD sum rulesParticle physicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyHyperonFOS: Physical sciencesCoupling (probability)PentaquarkNuclear physicsHigh Energy Physics - PhenomenologyParticle decayColor modelHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics::ExperimentNuclear Experimentdescription
In a diquark-diquark-antiquark picture of the pentaquark we study the decay $\Theta \rightarrow K^{+} n$ within the framework of QCD sum rules. After evaluation of the relevant three-point function, we extract the coupling $g_{\Theta nK}$ which is directly related to the pentaquark width. Restricting the decay diagrams to those with color exchange between the meson-like and baryon-like clusters reduces the coupling constant by a factor of four. 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-03-18 | Physical Review D |