Is $d^*$ a candidate of hexaquark-dominated exotic state?

Huang, Fei; Zhang, Z. Y.; Shen, P. N.; Wang, W. L.

doi:10.48550/arxiv.1408.0458

Cited by 11 publications

(23 citation statements)

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“…[1] on purely phenomenological grounds for the description of the ABC effect is possibly at variance with the data for isoscalar two-pion production in non-fusion channels. Hence alternative solutions for this phenomenon may have to be looked for, such as d-wave contributions in the intermediate ∆∆ system and/or final nucleon-pair [34,35].…”

Section: Resultsmentioning

confidence: 99%

Measurement of the $np \to npπ^0π^0$ Reaction in Search for the Recently Observed $d^*(2380)$ Resonance

Adlarson,

Augustyniak,

Bardan

et al. 2014

Preprint

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Exclusive measurements of the quasi-free np → npπ 0 π 0 reaction have been performed by means of d p collisions at T d = 2.27 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region √ s = (2.35 -2.46) GeV, which includes the region of the ABC effect and its associated d * (2380) resonance. Adding the d * resonance amplitude to that for the conventional processes leads to a reasonable description of the data. The observed resonance effect in the total cross section is in agreement with the predictions of Fäldt and Wilkin as well Albadajedo and Oset. The ABC effect, i.e. the low-mass enhancement in the π 0 π 0 -invariant mass spectrum, is found to be very modest -if present at all, which might pose a problem to some of its interpretations.

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Section: Resultsmentioning

confidence: 99%

Measurement of the $np \to npπ^0π^0$ Reaction in Search for the Recently Observed $d^*(2380)$ Resonance

Adlarson,

Augustyniak,

Bardan

et al. 2014

Preprint

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“…In particular, R ∆∆ =0.76 fm from the quark-based model of Ref. [19], as shown on the l.h.s. panel of Fig.…”

Section: Introductionmentioning

confidence: 87%

“…Realizing that the decay pions from a d * (2380) compact ∆∆ component have particularly low momenta, we compute M π 0 π 0 = 314 MeV by using the value q ∆→Nπ = 113.6 MeV/c, corresponding to R ∆∆ = 0.76 fm from the quark-based calculations of Ref. [19]. The ABC enhancement appears not to arise in the pn → pnπ 0 π 0 non-fusion reaction, apparently because the outgoing quasi-free nucleons manage to affect the ∆ → Nπ decay spectra more readily than when bound in the deuteron.…”

Section: Introductionmentioning

confidence: 99%

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The d ⁎ (2380) dibaryon resonance width and decay branching ratios

Gal

2017

Physics Letters B

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Attempts to reproduce theoretically the width Γ d * = 80 ± 10 MeV of the I(J P ) = 0(3 + ) d * (2380) dibaryon resonance established by the WASA-at-COSY Collaboration are discussed. The validity of associating the d * (2380) in quark-based models exclusively with a tightly bound ∆∆ configuration is questioned. The d * (2380) width and decay branching ratios into NNππ, NNπ and NN final states are studied within the Gal-Garcilazo hadronic model in which the d * (2380) is a πN∆ resonance embedded in the NNππ continuum some 80 MeV below the ∆∆ threshold. In particular, predictions are made for the branching ratios of the unobserved yet d * (2380) → NNπ decays which are suppressed in a purely-∆∆ dibaryon model. Comments are also made on a possible connection of the ABC effect observed in the pn → d * → dπ 0 π 0 resonance reaction to the d * (2380) dibaryon.

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“…( 22), the RGM equation for a bound state problem, in both the chiral SU(3) quark model and the extended chiral SU(3) quark model with the parameters listed in Table I. The results are tabulated in Table II [25]. Let's first focus on the results from a ∆∆ (L = 0, 2) double-channel calculation.…”

Section: Energy and Structure Of D *mentioning

confidence: 99%

Understanding the structure of d*(2380) in chiral quark model

Huang

Shen

Dong

et al. 2016

Sci. China Phys. Mech. Astron.

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The structure and decay properties of d * have been detailedly investigated in both the chiral SU(3) quark model and the extended chiral SU(3) quark model that describe the energies of baryon ground states and the nucleon-nucleon (NN) scattering data satisfactorily. By performing a dynamical coupled-channels study of the system of ΔΔ and hidden-color channel (CC) with quantum numbers I(J P ) = 0(3 + ) in the framework of the resonating group method (RGM), we find that the d * has a mass of about 2.38-2.42 GeV and a root-mean-square radius (RMS) of about 0.76-0.88 fm. The channel wave function is extracted by a projection of the RGM wave function onto the physical basis, and the fraction of CC component in the d * is found to be about 66%-68%, which indicates that the d * is a hexaquark-dominated exotic state. Based on this scenario the partial decay widths of d * → dπ 0 π 0 and d * → dπ + π − are further explicitly evaluated and the total width is then obtained by use of the branching ratios extracted from the measured cross sections of other possible decay channels. Both the mass and the decay width of d * calculated in this work are compatible with the data (M ≈ 2380 MeV, Γ ≈ 70 MeV) reported by WASA-at-COSY Collaboration. hexaquark state, d * (2380), quark model, hidden-color channel PACS number(s): 14.20.Pt, 13.75.Cs, 12.39.Jh, 13.30.Eg Citation:

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Is $d^*$ a candidate of hexaquark-dominated exotic state?

Cited by 11 publications

References 0 publications

Measurement of the $np \to npπ^0π^0$ Reaction in Search for the Recently Observed $d^*(2380)$ Resonance

Measurement of the $np \to npπ^0π^0$ Reaction in Search for the Recently Observed $d^*(2380)$ Resonance

The d ⁎ (2380) dibaryon resonance width and decay branching ratios

Understanding the structure of d*(2380) in chiral quark model

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