Neural network study of hidden-charm pentaquark resonances

Mutuk, Halil

doi:10.1088/1674-1137/43/9/093103

Cited by 44 publications

(28 citation statements)

References 79 publications

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“…Although the molecular-state interpretation is quite consistent with the current LHCb observation, there are still many other proposals to understand the origin of these P c states [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Moreover, up to now, these hidden-charm pentaquarks were still only observed in the Λ b decay at LHCb.…”

Section: Introductionsupporting

confidence: 55%

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Pion-induced production of hidden-charm pentaquarks P(4312),P(4440), and P(4457)

Wang

Chen

et al. 2019

Physics Letters B

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The production of the hidden-charm pentaquarks P c via pion-induced reaction on a proton target is investigated within an effective Lagrangian approach. Three experimentally observed states, P c (4312), P c (4440), and P c (4457), are considered in the calculation, and the Reggeized t-channel meson exchange is considered as main background for the reaction π − p → J/ψn. The numerical results show that the experimental data of the total cross section of the reaction π − p → J/ψn at W ≃ 5 GeV can be well explained by contribution of the Reggeized t channel with reasonable cutoff. If the branching ratios Br[P c → J/ψN] ≃ 3% and Br[P c → πN] ≃ 0.05% are taken, the average value of the cross section from the P c (4312) contribution is about 1.2 nb/100 MeV, which is consistent with existing rude data at near-threshold energies. The results indicate that the branching ratios of the P c states to the J/ψN and πN should be small. The shape of differential cross sections shows that the Reggeized t-channel provides a sharp increase at extreme forward angles, while the differential cross sections from the P c states contributions are relatively flat. High-precision experimental measurements on the reaction π − p → J/ψn at near-threshold energies are suggested to confirm the LHCb hidden-charm pentaquarks as genuine states, and such experiments are also helpful to understand the origin of these resonance structures.

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Section: Introductionsupporting

confidence: 55%

“…8 −0.6 MeV was also reported. After the result was released, the theoretical researches on these three P c states is springing up [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Pion-induced production of hidden-charm pentaquarks P(4312),P(4440), and P(4457)

Wang

Chen

et al. 2019

Physics Letters B

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“…Very recently, the LHCb Collaboration updated its analysis of the J=ψp invariant mass spectroscopy of Λ b → KJ=ψp and found three pentaquark states, which are P þ c ð4312Þ, P þ c ð4440Þ, and P þ c ð4457Þ [33]. After the new observation, some interpretation has been proposed immediately in the molecular [34][35][36][37][38][39][40][41][42][43][44][45][46][47] and pentaquark scenarios [48][49][50][51][52][53][54]. In addition, by fitting the LHCb data around 4312 MeV with the amplitudes satisfying the general principles of S-matrix theory, P c ð4312Þ is assigned as a virtual state resulting from the weak interactions ofD and Σ c [55].…”

Section: Introductionmentioning

confidence: 99%

Production of Pc states from Λb decay

Chen

2019

Phys. Rev. D

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In the present work, we investigate P c ð4312Þ, P c ð4440Þ, and P c ð4457Þ production from Λ b decay in a molecular scenario by using an effective Lagrangian approach. We predict the ratio of the branching fraction of Λ b → P c K, which is weakly dependent on our model parameter. We also find the ratios of the productions of the branching fractions of Λ b → P c K and P c → J=ψp can be well interpreted in the molecular scenario. Moreover, the estimated branching fractions of Λ b → P c K are of order 10 −6 , which could be tested by further measurements by the LHCb Collaboration.

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“…A common one is the baryonmeson molecular picture, i.e. Σ cD ( * ) states described within different kind of formalisms such as effective field theories [3,4], heavy quark spin symmetry approach [5,6], phenomenological potential models [7][8][9][10][11][12][13], heavy hadron chiral perturbation theory [14], and QCD sum rules [15,16]. The P c (4312) + and P c (4457) + signals have been studied independently in Refs.…”

Section: Introductionmentioning

confidence: 99%

Doubly charmed pentaquarks

2020

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The LHCb Collaboration, using its full data set from runs 1 and 2, announced in 2019 a surprising update of the hidden-charm pentaquark states Pc(4380) + and Pc(4450) + , observed in 2015. A new state, Pc(4312) + , was clearly seen at lower energies; furthermore, the original Pc(4450) resonance was resolved into two individual states, named the Pc(4440) + and the Pc(4457) + . Motivated by the fact that these new hidden-charm pentaquark states were successfully predicted by our chiral quark model, we extend herein such study to the doubly charmed sector. The analyzed total spin and parity quantum numbers are J P = 1

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Neural network study of hidden-charm pentaquark resonances

Cited by 44 publications

References 79 publications

Pion-induced production of hidden-charm pentaquarks P(4312),P(4440), and P(4457)

Pion-induced production of hidden-charm pentaquarks P(4312),P(4440), and P(4457)

Production of Pc states from Λb decay

Doubly charmed pentaquarks

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