Sea-quark flavor content of octet baryons and intrinsic five-quark Fock states

An, Chun-Sheng; Saghai, B.

doi:10.1103/physrevc.85.055203

Cited by 21 publications

(71 citation statements)

References 81 publications

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“…The present work is in line with our earlier efforts [34,35,39] in that realm. There are several difficulties in this endeavor: few observables have been identified carrying information on higher Fock states, the data are scarce and often bear large uncertainties due to the smallness of the effects looked for.…”

Section: Discussionsupporting

confidence: 92%

“…octet baryons [39]. Note that in the SU(3) symmetric case, the ratio of probabilities for five-quark components with strange and light quark-antiquark pairs is 1/2 [16], while by taking into account the SU(3) symmetry breaking effects, we determined [39] that ratio to be P ss /(P uū + P dd ) = 0.057/(0.098 + 0.216) ∼ 0.18 and putting P ss ∼ 6%.…”

Section: Introductionmentioning

confidence: 99%

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Strangeness magnetic form factor of the proton in the extended chiral quark model

Saghai

2013

Phys. Rev. C

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Background: Unravelling the role played by nonvalence flavors in baryons is crucial in deepening our comprehension of QCD. The strange quark, a component of the higher Fock states in baryons, is an appropriate tool to study nonperturbative mechanisms due to the pure sea quark.Purpose: Study the magnitude and the sign of the strangeness magnetic moment µ s and the magnetic form factor (G s M ) of the proton. Methods:Within an extended chiral constituent quark model, we investigate contributions from all possible five-quark components to µ s and G s M (Q 2 ) in the four-vector momentum range Q 2 ≤ 1 (GeV/c) 2 . The probability of the strangeness component in the proton wave function is calculated employing the 3 P 0 model. Results:Predictions are obtained by using input parameters taken from the literature. The observables µ s and G s M (Q 2 ) are found to be small and negative, consistent with the lattice-QCD findings as well as with the latest data released by the PVA4 and HAPPEX Collaborations.Conclusions: Due to sizeable cancelations among different configurations contributing to the strangeness magnetic moment of the proton, it is indispensable to i) take into account all relevant five-quark components and include both diagonal and non-diagonal terms, ii) handle with care the oscillator harmonic parameter ω 5 and the ss component probability.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Strangeness magnetic form factor of the proton in the extended chiral quark model

Saghai

2013

Phys. Rev. C

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“…As we know, the constituent quark mass of charm quark should be ∼ 1200 − 1300 MeV higher than that of light quark, while the studied pentaquark configurations in [25] are 1/2 + states, namely, those configurations are the first orbitally excited pentaquark states, which should raise up E 0 by about 200 − 300 MeV. Accordingly, the value for E 0 obtained in present work is reasonable.…”

Section: Numerical Resultssupporting

confidence: 50%

“…MeV higher than the one obtained by fitting the data for sea content in nucleon [25]. As we know, the constituent quark mass of charm quark should be ∼ 1200 − 1300 MeV higher than that of light quark, while the studied pentaquark configurations in [25] are 1/2 + states, namely, those configurations are the first orbitally excited pentaquark states, which should raise up E 0 by about 200 − 300 MeV.…”

Section: Numerical Resultsmentioning

confidence: 84%

Observed Ωc0 resonances as pentaquark states

Chen

2017

Phys. Rev. D

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In present work, we investigate the spectrum of several low-lying sscqq pentaquark configurations employing the constituent quark model, within which the hyperfine interaction between quarks is taken to be mediated by Goldstone boson exchange. Our numerical results show that four sscqq configurations with J P = 1/2 − or J P = 3/2 − lie at energies very close to the recently observed five Ω 0 c states by LHCb collaboration, this indicates that the sscqq pentaquark configurations may form sizable components of the observed Ω 0 c resonances.

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“…For such transitions, the key ingredient is the QQ creation mechanism. Most widely accepted is the 3 P 0 model [8], which has been successfully applied to the decays of mesons and baryons [9,10], and this was also employed to analyse the sea flavor content of the ground states of the SU (3) octet baryons [11,12], as well as of the spin and electromagnetic properties of baryons [13,14]. In the 3 P 0 model, the QQ pair is created with the quantum numbers of the QCD vacuum 0 ++ , which corresponds to 3 P 0 .…”

Section: Introductionmentioning

confidence: 99%

Mixing of the low-lying three- and five-quarkΩstates with negative parity

Metsch

Zou

2013

Phys. Rev. C

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Mixing of the low-lying three-and five-quark Ω states with spin-parity quantum numbers 1 2 − and 3 2 − is investigated, employing an instanton-induced quark-antiquark pair creation model, which precludes transitions between s 3 and s 4s configurations. Models with hyperfine interactions between quarks of three different kinds, namely, one-gluon-exchange, Goldstone-boson-exchange (GBE) and an instanton-induced interaction (INS) are called OGE, GBE and INS models, respectively. Numerical results show that the instanton-induced pair creation causes strong mixing between the threeand five-quark configurations with spin 3/2, and that this mixing decreases the energy of the lowest spin 3/2 states in all three different hyperfine interaction models to ∼ 1750 ± 50 MeV. On the other hand, transition couplings between s 3 and s 3 qq states with spin 1/2 caused by instanton-induced qq creation is very small and the resulting mixing of three-and five-quark configurations in the OGE and INS models is negligible, while the mixing of the spin 1/2 states in GBE model is not, but effects of this mixing on energies of mixed states are also very small. Accordingly, the lowest Ω states with negative parity in all three hyperfine interactions models have spin 3/2.

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Sea-quark flavor content of octet baryons and intrinsic five-quark Fock states

Cited by 21 publications

References 81 publications

Strangeness magnetic form factor of the proton in the extended chiral quark model

Strangeness magnetic form factor of the proton in the extended chiral quark model

Observed Ωc0 resonances as pentaquark states

Mixing of the low-lying three- and five-quarkΩstates with negative parity

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