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24 pages, 515 KiB

Open AccessArticle

Hidden-Charm Pentaquarks with Strangeness in a Chiral Quark Model

by Gang Yang, Jialun Ping and Jorge Segovia

Symmetry 2024, 16(3), 354; https://doi.org/10.3390/sym16030354 - 14 Mar 2024

Cited by 7 | Viewed by 1526

The LHCb collaboration has recently announced the discovery of two hidden-charm pentaquark states with strange quark content,

P_{c s} (4338)

and

P_{c s} (4459)

; its analysis points towards having both hadrons’ isospins equal to zero and [...] Read more.

The LHCb collaboration has recently announced the discovery of two hidden-charm pentaquark states with strange quark content,

P_{c s} (4338)

and

P_{c s} (4459)

; its analysis points towards having both hadrons’ isospins equal to zero and spin-parity quantum numbers

{\frac{1}{2}}^{-}

and

{\frac{3}{2}}^{-}

, respectively. Herein, we perform a systematical investigation of the

q q s c \bar{c}

(q = u, d)

system by means of a chiral quark model, along with a highly accurate computational method, the Gaussian expansion approach combined with the complex scaling technique. baryon-meson configurations in both singlet- and hidden-color channels are considered. The

P_{c s} (4338)

and

P_{c s} (4459)

signals can be well identified as molecular bound states with dominant components

Λ J / ψ

(60 %)

and

Ξ_{c} D

(23 %)

for the lowest-energy case and

Ξ_{c} D^{*}

(72 %)

for the highest-energy one. In addition, it seems that some narrow resonances can also be found in each allowed

I (J^{P})

channel in the energy region of

4.6

–

5.5

GeV, except for the

1 ({\frac{1}{2}}^{-})

channel where a shallow bound state with dominant

Ξ_{c}^{*} D^{*}

structure is obtained at 4673 MeV with binding energy

E_{B} = - 3

MeV. These exotic states are expected to be confirmed in future high-energy experiments. Full article

(This article belongs to the Section Physics)

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14 pages, 380 KiB

Open AccessArticle

Study of Hidden-Charm and Hidden-Bottom Pentaquark Resonances in the Quark Model

by Xinmei Zhu, Yuheng Wu, Hongxia Huang, Jialun Ping and Youchang Yang

Universe 2023, 9(6), 265; https://doi.org/10.3390/universe9060265 - 31 May 2023

Cited by 3 | Viewed by 1366

Abstract

Inspired by the LHCb observation of hidden-charm pentaquarks, i.e.,

P_{c} (4312)

P_{c} (4440)

, and

P_{c} (4457)

in the

J / ψ p

invariant mass spectrum, a calculation of the [...] Read more.

Inspired by the LHCb observation of hidden-charm pentaquarks, i.e.,

P_{c} (4312)

P_{c} (4440)

, and

P_{c} (4457)

in the

J / ψ p

invariant mass spectrum, a calculation of the

J / ψ p

scattering cross-section was performed using the quark-delocalization color screening model. The results show that

P_{c} (4312)

can be identified as a hidden-charm molecular state

Σ_{c} D

with

J^{P} = {\frac{1}{2}}^{-}

. The two-peak structure can be reproduced around 4450 MeV, which corresponds to

P_{c} (4440)

and

P_{c} (4457)

. They are the resonances molecular states

Σ_{c} D^{*}

J^{P} = {\frac{1}{2}}^{-}

and

J^{P} = {\frac{3}{2}}^{-}

. Moreover, the

Σ_{c}^{*} D^{*}

of both

J^{P} = {\frac{1}{2}}^{-}

and

J^{P} = {\frac{3}{2}}^{-}

are possible molecular pentaquarks. Moreover, in the same theoretical frame, the calculation is extended to the

P_{c}

-like molecular pentaquarks, denoted as

P_{b}

. Several hidden-bottom pentaquarks with masses above 11 GeV and narrow widths were obtained. All of these heavy pentaquarks are worth exploring in future experiments. Full article

(This article belongs to the Special Issue Universe: Feature Papers 2024—High Energy Nuclear and Particle Physics)

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78 pages, 1348 KiB

Open AccessFeature PaperEditor’s ChoiceArticle

Tetra- and Penta-Quark Structures in the Constituent Quark Model

by Gang Yang, Jialun Ping and Jorge Segovia

Symmetry 2020, 12(11), 1869; https://doi.org/10.3390/sym12111869 - 13 Nov 2020

Cited by 114 | Viewed by 5565

Abstract

With the development of high energy physics experiments, a large amount of exotic states in the hadronic sector have been observed. In order to shed some light on the nature of the tetraquark and pentaquark candidates, a constituent quark model, along with the Gaussian expansion method, has been employed systematically in real- and complex-range investigations. We review herein the double- and fully-heavy tetraquarks, but also the hidden-charm, hidden-bottom and doubly charmed pentaquarks. Several exotic hadrons observed experimentally were well reproduced within our approach; moreover, their possible compositeness and other properties, such as their decay widths and general patterns in the spectrum, are analyzed. Besides, we report also some theoretical predictions of tetra- and penta-quark states which have not seen by experiment yet. Full article

(This article belongs to the Special Issue Advances in Chiral Quark Models)

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