Heavy pentaquark states and a novel color structure

Deng, Chengrong; Ping, J. L.; Huang, Hongxia; Wang, Fan

doi:10.1103/physrevd.95.014031

“…In the past year, the P c (4380) and P c (4450) have been studied by various methods and models in order to explain their nature. There are many possible interpretations, such as meson-baryon molecules [12][13][14][15][16][17][18][19][20][21][22][23], compact diquark-diquark-antiquark pentaquarks [24][25][26][27], compact diquark-triquark pentaquarks [28,29], genuine multiquark states other than molecules [30][31][32][33][34][35], and kinematical effects related to thresholds and triangle singularity [36][37][38][39][40], etc. Their productions and decay properties are also interesting [41][42][43][44][45][46][47][48][49][50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

Revisiting hidden-charm pentaquarks from QCD sum rules

Xiang

¹

,

Chen

²

,

Chen

³

et al. 2019

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We revisit the hidden-charm pentaquark states Pc(4380) and Pc(4450) using the method of QCD sum rules by requiring the pole contribution to be larger than or around 30% to better insure the one-pole parametrization to be valid. We find two mixing currents and our results suggest that the Pc(4380) and Pc(4450) can be identified as hidden-charm pentaquark states having J P = 3/2 − and 5/2 + , respectively, while there still exist other possible spin-parity assignments, such as J P = 3/2 + and J P = 5/2 − , which needs to be clarified in further theoretical and experimental studies.All the local hidden-charm pentaquark interpolating currents have been systematically constructed in Refs. [57,58], and some of them were selected to perform QCD sum rule analyses. The results suggest that the P c (4380) and P c (4450) can be interpreted as hidden-charm pentaquark states composed of anticharmed mesons and charmed baryons. However, the analyses therein use one criterion which is not optimized, that is to require the pole contribution to be larger than 10% to insure the one-pole parametrization to be valid. This value is not so significant, and accordingly, the question arises whether we can find a larger pole contribution to better insure the one-pole parametrization?In the present study we try to answer this question in order to find better (more reliable) QCD sum rule results. Especially, we find the following two mixing currents: * ] channels, etc.

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“…After the announcement of the P c (4380) and P c (4450) states by LHCb, these two P c states were interpreted as Σ cD * , Σ * cD , or Σ * cD * molecules [17][18][19][20][21][22][23][24][25][26][27][28], bound states or resonances of charmonium and nucleon [29][30][31][32], diquarkdiquark-antiquark states [33][34][35][36][37][38], diquark-triquark states [39,40], compact pentaquark states [41][42][43], kinematical effects due to χ c1 p rescattering [44], due to triangle singularity [45][46][47], or due to aD-soliton [48], or a bound state of the colored baryon and meson [49]. Their decay and production properties were studied in Refs.…”

Section: Introductionmentioning

confidence: 99%

Hidden-charm pentaquarks and their hidden-bottom and Bc -like partner states

Wu

¹

,

Liu

²

,

Chen

³

et al. 2017

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In the framework of the color-magnetic interaction, we have systematically studied the mass splittings of the possible hidden-charm pentaquarks qqqcc (q = u, d, s) where the three light quarks are in a color-octet state. We find that i) the LHCb Pc states fall in the mass region of the studied system; ii) most pentaquarks should be broad states since their S-wave open-charm decays are allowed while the lowest state is the J P = 1 2 − Λ-like pentaquark with probably the suppressed ηcΛ decay mode only; and iii) the J P = 5 2 − states do not decay through S-wave and their widths are not so broad. The masses and widths of the two LHCb Pc baryons are compatible with such pentaquark states. We also explore the hidden-bottom and Bc-like partners of the hidden-charm states and find the possible existence of the pentaquarks which are lower than the relevant hadronic molecules.

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“…These P + c states all have a common feature that a e-mail: jlping@njnu.edu.cn (corresponding author) they are very close to baryon-meson thresholds, which led to one of the most popular interpretation of these P + c states as molecular states [5][6][7][8][9][10][11]. Other possible explanations also exist, such as the compact pentaquark states [12,13]. In addition, the decay properties and width of these P + c states also have been investigated in Ref.…”

Section: Introductionmentioning

confidence: 99%

Investigation of hidden-charm pentaquarks with strangeness $$S=-1$$

Hu

¹

,

Ping

²

2022

Self Cite

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Recently, a new hidden-charm pentaquark state $$P_{cs}(4459)$$ P cs ( 4459 ) was reported by the LHCb Collaboration. Stimulated by the fact that all hidden-charm pentaquark states in $$S=0$$ S = 0 systems were successfully studied by the chiral quark model, we extended this study to the $$S=-1$$ S = - 1 systems. All possible states with quantum numbers $$IJ^P=0(\frac{1}{2})^-$$ I J P = 0 ( 1 2 ) - , $$0(\frac{3}{2})^-$$ 0 ( 3 2 ) - , $$0(\frac{5}{2})^-$$ 0 ( 5 2 ) - , $$1(\frac{1}{2})^-$$ 1 ( 1 2 ) - , $$1(\frac{3}{2})^-$$ 1 ( 3 2 ) - and $$1(\frac{5}{2})^-$$ 1 ( 5 2 ) - have been investigated. The calculation results shows that the newly observed state $$P_{cs}(4459)$$ P cs ( 4459 ) can be explained as $$\Xi _c \bar{D}^*$$ Ξ c D ¯ ∗ molecular state and the quantum numbers are $$0(\frac{1}{2})^-$$ 0 ( 1 2 ) - . In addition, we also find other molecular states $$\Xi _c \bar{D}$$ Ξ c D ¯ , $$\Xi _c^* \bar{D}$$ Ξ c ∗ D ¯ and $$\Xi _c' \bar{D}^*$$ Ξ c ′ D ¯ ∗ . It is worth mentioning that $$\Xi _c \bar{D}^*$$ Ξ c D ¯ ∗ can form a two-peak structure from states in system $$0(\frac{1}{2})^-$$ 0 ( 1 2 ) - and $$0(\frac{3}{2})^-$$ 0 ( 3 2 ) - . The decay width of all molecular states is given with the help of real scaling method. These hidden-charm pentaquark states is expected to be further verified in future experiments.

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Heavy pentaquark states and a novel color structure

Cited by 29 publications

References 59 publications

Revisiting hidden-charm pentaquarks from QCD sum rules

Revisiting hidden-charm pentaquarks from QCD sum rules

Hidden-charm pentaquarks and their hidden-bottom and Bc -like partner states

Investigation of hidden-charm pentaquarks with strangeness $$S=-1$$

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