Pentaquark baryons in the SU(3) quark model

Oh, Yongseok; Kim, Hungchong

doi:10.1103/physrevd.70.094022

Cited by 30 publications

(20 citation statements)

References 109 publications

(94 reference statements)

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“…Using a SU(4) estimate a width results of about 150 MeV. Moderate SU(4) breaking allows to reduce the width down to [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] MeV within the range suggested in [6]. A small OZI violating φ µ DD vertex can be used to increase the mass of the state up to the empirical value of 3.52 GeV.…”

Section: Introductionmentioning

confidence: 99%

Coupled-channel study of crypto-exotic baryons with charm

Hofmann¹,

Lutz²

2005

Nuclear Physics A

256

420

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Identifying the t-channel exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a surprisingly rich spectrum of molecules is formed. We argue that chiral symmetry and large- N_c considerations determine that part of the interaction which generates the spectrum. All channels that are required by the existence of (u,d,s,c) quarks are considered. A bound state with exotic quantum numbers is predicted at mass 2.78 GeV. It couples strongly to the (bar D_s N),(bar D Lambda),(bar D Sigma) channels. A further charm minus-one system is predicted at mass 2.84 GeV as a result of (bar D_s Lambda), (bar D Xi) interactions. We suggest the existence of strongly bound crypto-exotic baryons, which contain a charm-anti-charm pair. Such states are narrow since they can decay only via OZI-violating processes. A narrow nucleon resonance is found at mass 3.52 GeV. It is a coupled-channel bound state of the (eta_c N), (bar D Sigma_c) system, which decays dominantly into the (eta' N) channel. Furthermore two isospin singlet hyperon states at mass 3.23 GeV and 3.58 GeV are observed as a consequence of coupled-channel interactions of the (bar D_s Lambda_c), (bar D Xi_c) and (eta_c Lambda),(bar D Xi_c') states. Most striking is the small width of about 1 MeV of the lower state. The upper state may be significantly broader due to a strong coupling to the (eta' Lambda) state. The two so far observed s-wave baryons with charm one are recovered. We argue that the Lambda_c(2880) is not a s-wave state. In addition to those states we predict the existence of about ten narrow s-wave baryon states with masses below 3 GeV.Comment: 51 pages, 3 figures, 25 tables some misprints are corrected, a few more references are adde

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Section: Introductionmentioning

confidence: 99%

Coupled-channel study of crypto-exotic baryons with charm

Hofmann¹,

Lutz²

2005

Nuclear Physics A

256

420

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“…Composite fermions play a significant role in modern quantum physics. Suffice it to mention a few instances of CFs: these include quasiparticles involved in the theory of fractional quantum Hall effect [1]; also, let us mention baryons and pentaquarks as known instances in hadron physics [2][3][4]. In this paper, we will focus on the entanglement properties of composite fermions basing on their fermionic oscillator realization, in two relatively simple cases: cofermion built from a pure fermion and a pure boson, or the cofermion as a composite made of a pure fermion and a deformed boson (taken in general form).…”

Section: Introductionmentioning

confidence: 99%

Composite Fermions as Deformed Oscillators: Wavefunctions and Entanglement

Gavrilik

Mishchenko

2019

Ukr. J. Phys.

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Composite structure of particles somewhat modifies their statistics, compared to the pure Boseor Fermi-ones. The spin-statistics theorem, so, is not valid anymore. Say, π-mesons, excitons, Cooper pairs are not ideal bosons, and, likewise, baryons are not pure fermions. In our preceding papers, we studied bipartite composite boson (i.e. quasiboson) systems via a realization by deformed oscillators. Therein, the interconstituent entanglement characteristics such as entanglement entropy and purity were found in terms of the parameter of deformation. Herein, we perform an analogous study of composite Fermi-type particles, and explore them in two major cases: (i) "boson + fermion" composite fermions (or cofermions, or CFs); (ii) "deformed boson + fermion" CFs. As we show, cofermions in both cases admit only the realization by ordinary fermions. Case (i) is solved explicitly, and admissible wavefunctions are found along with entanglement measures. Case (ii) is treated within few modes both for CFs and constituents. The entanglement entropy and purity of CFs are obtained via the relevant parameters and illustrated graphically. K e y w o r d s: composite fermions (cofermions), composite bosons (cobosons, quasibosons), realization by deformed oscillators, bipartite entanglement, entanglement entropy, purity.

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“…In addition, there is a debate on the parity of Θ in lattice calculation [119] and the parity-flip was claimed in QCD sum rules [92] with heavier anti-quark. (See 7 Flavor SU(3) symmetry allows three kinds of Θ baryons in quark models; isosinglet in antidecuplet, isovector in 27-plet, and isotensor in 35-plet [162]. also Refs.…”

Section: Figmentioning

confidence: 99%

“…[122][123][124], which motivated the development of a chiral Lagrangian for antidecuplet [160,161]. In a recent paper [162] the SU(3) quark model has been extended to obtain the flavor wave functions of all pentaquark states including singlet, octet, decuplet, antidecuplet, 27-plet and 35-plet. Thus the SU(3) symmetric Lagrangian describing the pentaquark-three-quark and pentaquark-pentaquark interactions with meson octet has been obtained.…”

Section: Figmentioning

confidence: 99%

Pentaquark Θ+(1540) production in γN→KK¯N reactions

Nakayama

Lee

2006

Physics Reports

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The recent developments in the search of exotic pentaquark hadrons are briefly reviewed. We then focus on investigating how the exotic pentaquark Θ(1540) baryon production can be identified in the γN → KKN reactions, focusing on the influence of the background (non-Θ production) mechanisms. By imposing the SU(3) symmetry and using various quark model predictions, we are able to fix the coupling constants for evaluating the kaon backgrounds, the KK production through the intermediate vector meson and tensor meson photoproduction, and the mechanisms involving intermediate Λ (1116), Λ(1405), Λ(1520), Σ(1193), Σ(1385), and ∆(1232) states. The vector meson photoproduction part is calculated from a phenomenological model which describes well the experimental data at low energies. We point out that the neutral tensor meson production can not be due to π 0 -exchange as done by Dzierba et al. [Phys. Rev. D 69, 051901 (2004)] because of C parity. The neutral tensor meson production is estimated by considering the vector meson exchange and found to be too weak to generate any peak at the position near Θ(1540). For Θ(1540) production, we assume that it is an isoscalar and hence can only be produced in γn → K + K − n and γp → K 0 K 0 p reactions, but not in γp → K + K − p and γn → K 0 K 0 n. The total cross section data of γp → K + K − p is thus used to fix the form factors which regularize the background amplitudes so that the signal of Θ(1540) in γn → K + K − n and γp → K 0 K 0 p cross sections can be predicted.We find that the predicted K + K − and K + n invariant mass distributions of the γn → K + K − n reaction can qualitatively reproduce the shapes of the JLab data. However, the predicted Θ(1540) peak can not be identified unambiguously with the data. High statistics experiments are needed to resolve the problem. We also find that an even-parity Θ is more likely to be detected, while it will be difficult to identify an odd-parity Θ, even if it exists, from the background continuum, if its coupling constants are small as in the present quark model predictions.

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Pentaquark baryons in the SU(3) quark model

Cited by 30 publications

References 109 publications

Coupled-channel study of crypto-exotic baryons with charm

Coupled-channel study of crypto-exotic baryons with charm

Composite Fermions as Deformed Oscillators: Wavefunctions and Entanglement

Pentaquark Θ+(1540) production in γN→KK¯N reactions

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