Penta-quark baryon in anisotropic lattice QCD

Abstract

The penta-quark(5Q) baryon is studied in anisotropic quenched lattice QCD with renormalized anisotropy a_s/a_t=4 for a high-precision mass measurement. The standard Wilson action at beta=5.75 and the O(a) improved Wilson quark action with kappa=0.1210(0.0010)0.1240 are employed on a 12^3 \times 96 lattice. Contribution of excited states is suppressed by using a smeared source. We investigate both the positive- and negative-parity 5Q baryons with I=0 and spin J=1/2 using a non-NK-type interpolating field. After chiral extrapolation, the lowest positive-parity state is found to have a mass, m_{Theta}=2.25 GeV, which is much heavier than the experimentally observed Theta^+(1540). The lowest negative-parity 5Q appears at m_{Theta}=1.75 GeV, which is near the s-wave NK threshold. To distinguish spatially-localized 5Q resonances from NK scattering states, we propose a new general method imposing a ``Hybrid Boundary Condition (HBC)'', where the NK threshold is artificially raised without affecting compact five-quark states. The study using the HBC method shows that the negative-parity state observed on the lattice is not a compact 5Q but an s-wave NK-scattering state.

arXiv comment11 pages, 6 figures, 6 tables

References in corpus (54)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Diquarks and Exotic Spectroscopy
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• 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
• 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
• Pentaquark hadrons from lattice QCD
• Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
• The Anisotropic Wilson Gauge Action
• A Lattice Study of the Nucleon Excited States with Domain Wall Fermions
• Understanding Pentaquark States in QCD
• Stable $uudd\bar{s}$ pentaquarks in the constituent quark model
• Lattice study of exotic S=+1 baryon
• Excited Baryons in Lattice QCD
• Search for the Pentaquark State in $\psi (2S)$ and $J/\psi$ Decays to $K_S^{0}p{K}^{-}\bar{n}$ and $K_S^0\bar{p}{K}^{+}n$
• Pentaquark in the Skyrme Model
• Penta-quark baryon from the QCD Sum Rule
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners
• Phenomenology of the Pentaquark Antidecuplet
• Z^* Resonances: Phenomenology and Models
• A study of pentaquarks on the lattice with overlap fermions
• Radial excitations of low--lying baryons and the $Z^{+}$ penta--quark
• Is Theta+(1540) a Kaon--Skyrmion Resonance?
• Are ${\Theta }^{+}$ and the Roper resonance diquark-diquark-antiquark states?
• Limits for the central production of Theta^+ and Xi^{--} pentaquarks in 920 GeV pA collisions
• Pentaquark states in a chiral potential
• Chiral soliton models, large N_c consistency and the Theta^+ exotic baryon
• ${\Theta }^{+}$ in a chiral constituent quark model and its interpolating fields
• Glueball Properties at Finite Temperature in SU(3) Anisotropic Lattice QCD
• The Theta+ (1540) as a heptaquark with the overlap of a pion, a kaon and a nucleon
• Negative-parity baryon spectra in quenched anisotropic lattice QCD
• Search for the ${\bar{\Theta }}^{-}\to$ K${}^{-}$ $\bar{n}$ with PHENIX
• Search for Theta(1540)^+ in exclusive proton-induced reaction p+C(N) \to Theta^+ \bar{K}^0 + C(N) at the energy of 70 GeV
• Scalar Glueball Mass Reduction at Finite Temperature in SU(3) Anisotropic Lattice QCD
• Positive Parity Pentaquarks Pragmatically Predicted
• A Method to Unambiguously Determine the Parity of the Theta+ Pentaquark
• Pentaquarks
• Search for Theta^+ and Xi^{--}_{3/2} pentaquarks in HERA-B
• High Statistics Search for the Theta+(1.54) Pentaquark State
• Theoretical Overview of the Pentaquark Baryons
• Is the Theta+ a K pi N bound state?
• Numerical study of O(a) improved Wilson quark action on anisotropic lattice
• A study of pentaquark $\Theta$ state in the chiral SU(3) quark model
• Magnetic moments of the exotic pentaquark baryons within the chiral quark-soliton model
• Magnetic moments of exotic pentaquarks in the chiral quark-soliton model
• Pentaquark spectrum in string dynamics
• Properties of baryon anti-decuplet
• Pentaquark Baryons in String Theory
• Baryon operators and spectroscopy in lattice QCD

Cited by in corpus (43)

• New Charmonium States in QCD Sum Rules: a Concise Review
• Five-body calculation of resonance and scattering states of pentaquark system
• Charmonium properties in deconfinement phase in anisotropic lattice QCD
• Signatures of S-wave bound-state formation in finite volume
• Search for the possible S=+1 Pentaquark states in Quenched Lattice QCD
• Multiparticle States and the Hadron Spectrum on the Lattice
• Search for the pentaquark resonance signature in lattice QCD
• Study of $Thet{a}^{+}(udud\bar{s})$ in lattice QCD with exact chiral symmetry
• On the Existence of Heavy Pentaquarks: The large Nc and Heavy Quark Limits and Beyond
• Experimental Review on Pentaquarks
• Spin 3/2 Pentaquark Resonance Signature in Lattice QCD
• Spin 3/2 Penta-quarks in anisotropic lattice QCD
• Low-lying $\Lambda$ Baryons with spin 1/2 in Two-flavor Lattice QCD
• Present status on experimental search for pentaquarks
• A lattice study of the pentaquark states
• A comprehensive search for the Θ^+ pentaquark on the lattice
• Pentaquark state in pole-dominated QCD sum rules
• Lowest-lying Tetra-Quark Hadrons in Anisotropic Lattice QCD
• Scalar and Vector 4Q Systems in Anisotropic Lattice QCD
• Further study on 5q configuration states in the chiral SU(3) quark model
• Hadron-hadron interaction from SU(2) lattice QCD
• Effects of Instanton Induced Interaction on the Pentaquarks
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ with QCD sum rules
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ with light-cone QCD sum rules
• Absence of evidence for pentaquarks on the lattice
• Restless pions: orbifold boundary conditions and noise suppression in lattice QCD
• Scalar-Quark Systems and Chimera Hadrons in SU(3)_c Lattice QCD
• Volume Dependence of Spectral Weights for Unstable Particles in a Solvable Model
• Possible quantum numbers of the pentaquark Θ^+(1540) in QCD sum rules
• Spin-3/2 Pentaquark in QCD Sum Rules
• A general study on the volume dependence of spectral weights in lattice field theory
• Calculating loops without loop calculations: NLO computation of pentaquark correlators
• Tetraquark and Pentaquark Systems in Lattice QCD
• Looking for pentaquarks in Lattice QCD
• Dynamics of Multiquark Systems: Mass, Width and Exotics
• The Quark Structure of Pentaquarks
• Light scalar mesons in 2+1 flavor full QCD
• Prediction of the masses and decay processes of strange, charmed and bottomed pentaquarks from the linear molecular crypto-heptaquark model
• Mass Spectra of Pentaquarks -- Overlap versus Wilson Fermions
• Baryons on the lattice
• P-wave Pentaquark and its Decay in the Quark Model with Instanton Induced Interaction
• Heavy Pentaquarks in the Diquark Model and the Large N_c Expansion
• Spectroscopy of Pentaquark Baryons