Surveying exotic pentaquarks with the typical $QQqq\overline{q}$ configuration

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Surveying exotic pentaquarks with the typical $Q Q q q \bar{q}$ configuration

Qin-Song Zhou, Kan Chen, Xiang Liu, Yan-Rui Liu, and Shi-Lin Zhu

Phys. Rev. C 98, 045204 – Published 15 October 2018

Abstract

As a hot issue, exploring exotic pentaquarks is full of challenges and opportunities for both theorist and experimentalist. In this work, we focus on a type of pentaquark with the $Q Q q q \bar{q}$ ( $Q = b, c$ ; $q = u, d, s$ ) configuration, where their mass spectrum is estimated systematically. In particular, our result indicates that there may exist some stable or narrow exotic pentaquark states. Obviously, our study may provides valuable information for further experimental search for the $Q Q q q \bar{q}$ pentaquarks. With the running of large Hadron collider beauty (LHCb) and forthcoming Belle II, we have a reason to believe that these predictions presented here can be tested.

Received 22 April 2018
Revised 5 September 2018

DOI:https://doi.org/10.1103/PhysRevC.98.045204

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Few-body systems QCD in nuclear reactions Quark model

Exotic baryons

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Qin-Song Zhou^1,2, Kan Chen^1,2, Xiang Liu^1,2,*, Yan-Rui Liu^3,†, and Shi-Lin Zhu^4,5,6,‡

¹School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
²Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China
³School of Physics and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan 250100, China
⁴School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
⁵Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
⁶Center of High Energy Physics, Peking University, Beijing 100871, China

^*xiangliu@lzu.edu.cn
^†yrliu@sdu.edu.cn
^‡zhusl@pku.edu.cn

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Vol. 98, Iss. 4 — October 2018

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Figure 1
SU(3) $_{f}$ weight diagrams for the $Q Q q q \bar{q}$ pentaquark states. (a) The two light quarks belong to ${\bar{3}}_{f}$ and (b) The two light quarks belong to $6_{f}$ .
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Figure 2
Relative positions (units: MeV) for the $c c n n \bar{q}$ , $b b n n \bar{q}$ , $c c s s \bar{q}$ , and $b b s s \bar{q}$ pentaquark states labeled with solid and dashed lines. The dotted lines indicate various baryon-meson thresholds. The $I = \frac{3}{2}$ and $\frac{1}{2} c c n n \bar{n}$ states with $I_{n n} = 1$ have the same mass spectrum and are shown in the diagram (a) with solid lines. The doubly bottom analog is shown in the diagram (c). When the isospin (spin) of an initial pentaquark state is equal to a number in the subscript (superscript) of a baryon-meson state, its decay into that baryon-meson channel through $S$ or $D$ wave is allowed by the isospin (angular momentum) conservation. We have adopted the masses estimated with the reference thresholds of (a) $Σ_{c} D$ , (b) $Σ_{c} D_{s}$ , (c) $Σ_{b} \bar{B}$ , (d) $Σ_{b} {\bar{B}}_{s}$ , (e) $Ω_{c} D$ , (f) $Ω_{c} D_{s}$ , (g) $Ω_{b} \bar{B}$ , and (h) $Ω_{b} {\bar{B}}_{s}$ .
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Figure 3
Relative positions (units: MeV) for the $b c n n \bar{q}$ and $b c s s \bar{q}$ pentaquark states labeled with solid and dashed lines. The dotted lines indicate various baryon-meson thresholds. The $I = \frac{3}{2}$ and $\frac{1}{2} b c n n \bar{n}$ states with $I_{n n} = 1$ have the same mass spectrum and are shown in the diagram (a) with solid lines. When the isospin (spin) of an initial pentaquark state is equal to a number in the subscript (superscript) of a baryon-meson state, its decay into that baryon-meson channel through $S$ or $D$ wave is allowed by the isospin (angular momentum) conservation. We have adopted the masses estimated with the reference thresholds of (a) $Σ_{c} \bar{B}$ , (b) $Σ_{c} {\bar{B}}_{s}$ , (c) $Ω_{c} \bar{B}$ , and (d) $Ω_{c} {\bar{B}}_{s}$ .
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Figure 4
Relative positions (units: MeV) for the $c c n s \bar{q}$ and $b b n s \bar{q}$ pentaquark states labeled with solid lines. The dotted lines indicate various baryon-meson thresholds. The $I = 0$ and $I = 1 c c n s \bar{n}$ states have the same mass spectrum and are shown in the diagram (a). The doubly bottom analog is shown in the diagram (c). When the spin of an initial pentaquark state is equal to a number in the superscript of a baryon-meson state, its decay into that baryon-meson channel through $S$ or $D$ wave is allowed by the angular momentum conservation. We have adopted the masses estimated with the reference thresholds of (a) $Ξ_{c}^{^{'}} D$ , (b) $Ξ_{c}^{^{'}} D_{s}$ , (c) $Ξ_{b}^{^{'}} \bar{B}$ , and (d) $Ξ_{b}^{^{'}} {\bar{B}}_{s}$ .
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Figure 5
Relative positions (units: MeV) for the $b c n s \bar{q}$ pentaquark states labeled with solid lines. The dotted lines indicate various baryon-meson thresholds. The $I = 0$ and $I = 1 b c n s \bar{n}$ states have the same mass spectrum and are shown in the diagram (a). When the spin of an initial pentaquark state is equal to a number in the superscript of a baryon-meson state, its decay into that baryon-meson channel through $S$ or $D$ waves is allowed by the angular momentum conservation. We have adopted the masses estimated with the reference thresholds of (a) $Ξ_{b}^{^{'}} D$ and (b) $Ξ_{b}^{^{'}} D_{s}$ .
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Physical Review C

covering nuclear physics

Surveying exotic pentaquarks with the typical $Q Q q q \bar{q}$ configuration

Qin-Song Zhou, Kan Chen, Xiang Liu, Yan-Rui Liu, and Shi-Lin Zhu

Phys. Rev. C 98, 045204 – Published 15 October 2018

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Physical Review C

covering nuclear physics

Surveying exotic pentaquarks with the typical QQqqq¯ configuration

Qin-Song Zhou, Kan Chen, Xiang Liu, Yan-Rui Liu, and Shi-Lin Zhu

Phys. Rev. C 98, 045204 – Published 15 October 2018

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Surveying exotic pentaquarks with the typical $Q Q q q \bar{q}$ configuration