Heavy pentaquarks

Huang, Peng-Zhi; Liu, Yan‐Rui; Deng, Wubing; Chen, Xingliang; Zhu, Shi-Lin

doi:10.1103/physrevd.70.034003

Cited by 68 publications

(114 citation statements)

References 48 publications

(31 reference statements)

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“…and Ξ ′− 5c (we follow [29] for the notation). 1 The corresponding flavor wave functions are summarized in Table I.…”

Section: ′0− 5cmentioning

confidence: 99%

“…Note that our numerical results are slightly different than that in [29]. If the H1 state turns out to have a positive parity and is a truly ground-state charmed pentaquark, it will have an important implication for the Jaffe-Wilczek model, namely, the diquark should not be treated as an idealized point-like scalar and there are significant hyperfine attractive interactions between the light antiquark and other four quarks of the pentaquark state [23].…”

Section: B Masses Of Heavy Pentaquark Statesmentioning

confidence: 99%

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Light-front approach for heavy pentaquark transitions

2004

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Assuming the two diquark structure for the pentaquark state as advocated in the Jaffe-Wilczek model, there exist exotic parity-even anti-sextet and parity-odd triplet heavy pentaquark baryons. The theoretical estimate of charmed and bottom pentaquark masses is quite controversial and it is not clear whether the ground-state heavy pentaquark lies above or below the strong-decay threshold. We study the weak transitions of heavy pentaquark states using the light-front quark model. In the heavy quark limit, heavy-to-heavy pentaquark transition form factors can be expressed in terms of three Isgur-Wise functions: two of them are found to be normalized to unity at zero recoil, while the third one is equal to 1/2 at the maximum momentum transfer, in accordance with the prediction of the large-N c approach or the quark model. Therefore, the light-front model calculations are consistent with the requirement of heavy quark symmetry. Numerical results for form factors and Isgur-Wise functions are presented. Decay rates of the weak decays Θ

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“…and Ξ ′− 5c (we follow [29] for the notation). 1 The corresponding flavor wave functions are summarized in Table I.…”

Section: ′0− 5cmentioning

confidence: 99%

Section: B Masses Of Heavy Pentaquark Statesmentioning

confidence: 99%

Light-front approach for heavy pentaquark transitions

2004

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“…The analyses of in-medium gluon propagators, however, can in principle be more non-linear and complex, as the quark loop effects may strongly depend on the phase structure [48][49][50][51][52][53]. For example the quarks entering the loop can be either gapped or gapless depending on the pairing near the Fermi surface, and add totally different contributions to the gluon polarization functions.…”

Section: Introductionmentioning

confidence: 99%

Gluon propagator in two-color dense QCD: Massive Yang-Mills approach at one loop

Suenaga

Kojo

2019

Phys. Rev. D

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We study the Landau gauge gluon propagators in dense two-color QCD at quark chemical potential, µq, in the range from 0.5 to 1.0 GeV not reachable by the perturbative method at weak coupling. In order to take into account the non-perturbative effects, at tree level we use a massive Yang-Mills model for the Yang-Mills theory (or the Curci-Ferrari model) which has successfully described the lattice results of the gluon and ghost propagators in the Landau gauge. We couple quarks to this theory and compute the one-loop polarization effects in medium. The presence of the gluon mass significantly tempers the medium effects and uncertainties associated with the strong coupling constant αs. The diquark condensate in two-color QCD is color-singlet, for which neither electric nor magnetic screening masses should appear at the scale less than the diquark gap. The presence of the gap helps to explain the lattice results which are not very sensitive to the quark density. Meanwhile we also found the limitation of the one-loop estimate as well as the lack of some physics in perturbative medium corrections. *

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“…These alternatives (g2SC and gCFL) however might be prone to instabilities, begging for serious scrutiny before this debate can be settled (e.g. Shovkovy, Rüster & Rischke 2005;He, Jin & Zhuang 2005;Huang & Shovkovy 2005). The differences in these studies are connected with the choice of the model parameters and are beyond the scope of this paper.…”

Section: Caveats On the 2sc Phase And Model Generalitiesmentioning

confidence: 99%

Cooling of quark stars in the colour superconductive phase: effect of photons from glueball decay

Ouyed

Hamp

Woodworth

2006

Monthly Notices of the Royal Astronomical Society

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The cooling history of a quark star in the colour superconductive phase is investigated. Here we specifically focus on the two‐flavour colour (2SC) phase where the novel process of photon generation via glueball (GLB) decay has already been investigated. The picture we present here can, in principle, be generalized to quark stars entering a superconductive phase where similar photon generation mechanisms are at play. As much as 1045–1047 erg of energy is provided by the GLB decay in the 2SC phase. The generated photons slowly diffuse out of the quark star, keeping it hot and radiating as a blackbody (with possibly a Wien spectrum in gamma‐rays) for millions of years. We discuss hot radio‐quiet isolated neutron stars in our picture (such as RX J185635–3754 and RX J0720.4–3125) and argue that their nearly blackbody spectra (with a few broad features) and their remarkably tiny hydrogen atmosphere are indications that these might be quark stars in the colour superconductive phase where some sort of photon generation mechanism (reminiscent of the GLB decay) has taken place. Fits to observed data of cooling compact stars favour models with superconductive gaps of Δ2SC∼ 15–35 MeV and densities ρ2SC= (2.5–3.0) ×ρN (ρN being the nuclear matter saturation density) for quark matter in the 2SC phase. If correct, our model combined with more observations of isolated compact stars could provide vital information to studies of quark matter and its exotic phases.

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Heavy pentaquarks

Cited by 68 publications

References 48 publications

Light-front approach for heavy pentaquark transitions

Light-front approach for heavy pentaquark transitions

Gluon propagator in two-color dense QCD: Massive Yang-Mills approach at one loop

Cooling of quark stars in the colour superconductive phase: effect of photons from glueball decay

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