Pentaquark Decay Width in QCD Sum Rules

Abstract

In a diquark-diquark-antiquark picture of the pentaquark we study the decay $\Theta \to K^{+}n$ 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.

20 pages, 6 figures

References in corpus (48)

• 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 S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS
• 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
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
• Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
• Evidence for a Narrow Anti-Charmed Baryon State
• Understanding Pentaquark States in QCD
• QCD sum rule approach for the light scalar mesons as four-quark states
• Search for the Pentaquark State in $\psi (2S)$ and $J/\psi$ Decays to $K_S^{0}p{K}^{-}\bar{n}$ and $K_S^0\bar{p}{K}^{+}n$
• Penta-quark baryon from the QCD Sum Rule
• Phenomenology of the Pentaquark Antidecuplet
• Are ${\Theta }^{+}$ and the Roper resonance diquark-diquark-antiquark states?
• Search for the ${\bar{\Theta }}^{-}\to$ K${}^{-}$ $\bar{n}$ with PHENIX
• Parity of ${\Theta }^{+}$(1540) from QCD sum rules
• Two-Hadron-Irreducible QCD Sum Rule for Pentaquark Baryon
• Pentaquarks
• Search for Theta^+ and Xi^{--}_{3/2} pentaquarks in HERA-B
• Systematics of Exotic Cascade Decays
• Theoretical Overview of the Pentaquark Baryons
• $g_{NK\Lambda }$ and $g_{NK\Sigma }$ from QCD Sum Rules in the ${\gamma }_5{\sigma }_{\mu \nu }$ structure
• Pentaquark Searches at CDF
• Anti-charmed pentaquark ${\Theta }_c(3099)$ from QCD sum rules
• Pentaquark baryons in SU(3) quark model
• The narrow width of the Θ^+ - a possible explanation
• Pentaquark Symmetries, Selection Rules and another potentially Narrow State
• Two-point correlation function with pion in QCD sum rules
• Pentaquark and diquark-diquark clustering: a QCD sum rule approach
• QCD sum rule calculation of the $\pi NN$ coupling-revisited
• Width of the J^P=1/2^+ pentaquark in the quark-diquark model
• Pentaquark decay is suppressed by chirality conservation
• How Hard Are the Form Factors in Hadronic Vertices with Heavy Mesons?
• Pentaquarks: review of the experimental evidence
• Light-Front Approach for Pentaquark Strong Decays
• A Perspective on Pentaquarks
• A Comparative Study of Pentaquark Interpolating Currents
• Determining Pentaquark Quantum Numbers from Strong Decays
• Narrow width pentaquarks
• Role of Large Gluonic Excitation Energy for Narrow Width of Penta-Quark Baryons in QCD String Theory
• Heavy and Light Pentaquark Chiral Lagrangian
• Hadronic Decays Involving Heavy Pentaquarks
• Pentaquarks in the Chiral Symmetry Limit
• Can Chiral Symmetry Explain the Small Pentaquark Width?

Cited by in corpus (15)

• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• $Z_c^{+}(3900)$ decay width in QCD sum rules
• Analysis of $P_c^{+}(4380)$ and $P_c^{+}(4450)$ as pentaquark states in the molecular picture with QCD sum rules
• $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}{\pi }^0$ decay widths from QCD sum rules
• Zc(4200)+ decay width as a charmonium-like tetraquark state
• A QCD sum rule calculation of the $X^{\pm }(5568)\to B_s^0{\pi }^{\pm }$ decay width
• Partial decay widths of $P_c(4312)$ as a $\bar{D}{\Sigma }_c$ molecular state
• Nuclear structure and reaction studies at SPIRAL
• The hadronic coupling constants of the lowest hidden-charm pentaquark state with the QCD sum rules in rigorous quark-hadron duality
• QCD sum rules for the anti-charmed pentaquark
• Decay width of the pentaquark state ${\Theta }^{+}(1540)$ with QCD sum rules
• QCD Sum Rule Study for a Possible Charmed Pentaquark Θc(3250)
• Understanding close-lying exotic charmonia states within QCD sum rules
• P-wave Pentaquark and its Decay in the Quark Model with Instanton Induced Interaction
• Pentaquark Decay in QCD Sum Rules