Theta++ from QCD sum rule

Abstract

We study the pentaquark $uudd\bar{s}$ with $J=3/2$ and I=1 (${\Theta }^{++}$) in the QCD sum rule approach. We derive the QCD sum rules for positive and negative parity states of the pentaquark. The QCD sum rule predicts that there exists ${\Theta }^{++}$ with negative parity and its mass is $1.5\sim 1.6$ GeV. The negative parity ${\Theta }^{++}$ can be extremely narrow, since it lies much below the $\Delta K$ threshold and the decay into $KN$ state is strongly suppressed due to the $D$-wave centrifugal barrier. Also, the possibility of the existence of the ${\Theta }^{++}$ with positive parity is not excluded. Although it nearly degenerates with the negative parity state, it may be broader than the negative parity state.

5 pages, 4 figures

References in corpus (17)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Diquarks and Exotic Spectroscopy
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• A Diquark-Triquark Model for the KN Pentaquark
• Pentaquark hadrons from lattice QCD
• Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
• Negative-parity Nucleon Resonance in the QCD Sum Rule
• Understanding Pentaquark States in QCD
• Lattice study of exotic S=+1 baryon
• Chiral-Soliton Predictions for Exotic Baryons
• Penta-quark baryon from the QCD Sum Rule
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners
• Are ${\Theta }^{+}$ and the Roper resonance diquark-diquark-antiquark states?

Cited by in corpus (5)

• Search for the possible S=+1 Pentaquark states in Quenched Lattice QCD
• Search for ${\Theta }^{++}$ Pentaquarks in the Exclusive Reaction $\gamma p\to K^{+}{K}^{-}p$
• Spin-3/2 pentaquark in the QCD sum rule
• Spin 3/2 Pentaquarks
• Calculating loops without loop calculations: NLO computation of pentaquark correlators