The Narrow ${\Theta }_5$ Pentaquark As The First Non-planar Hadron With the Diamond Structure And Negative Parity

Abstract

Using the picture of the flux tube model, we propose that the ${\Theta }_5$ pentaquark as the first candidate of the three-dimensional non-planar hadron with the extremely stable diamond structure. The up and down quarks lie at the corners of the diamond while the anti-strange quark sits in the center. Various un-excited color flux tubes between the five quarks bind them into a stable and narrow color-singlet. Such a configuration allows the lowest state having the negative parity naturally. The decay of the ${\Theta }_5$ pentaquark into the nucleon and kaon requires the breakup of the non-planar diamond configuration into two conventional planar hadrons, which involves some kind of structural phase transition as in the condensed matter physics. Hence the width of the ${\Theta }^{+}$ pentaquark should be narrow despite that it lies above the kaon nucleon threshold. We suggest that future lattice QCD calculation adopt non-planar interpolating currents to explore the underlying structure of the ${\Theta }_5$ pentaquark.

References in corpus (4)

• Diquarks and Exotic Spectroscopy
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Viewing the Proton Through "Color"-Filters
• Understanding Pentaquark States in QCD

Cited by in corpus (7)

• First Study for the Pentaquark Potential in SU(3) Lattice QCD
• The static tetraquark and pentaquark potentials
• A lattice study of the pentaquark states
• Axial vector tetraquark with S=+2
• Study of a possible S=+1 dynamically generated baryonic resonance
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• Effect of Chiral Symmetry Restoration on Pentaquark ${\Theta }^{+}$ Mass and Width at Finite Temperature and Density