Understanding the newly observed heavy pentaquark candidates

Liu, Xiaohai; Wang, Qian; Zhao, Qiang

doi:10.1016/j.physletb.2016.03.089

Cited by 254 publications

(167 citation statements)

References 35 publications

(37 reference statements)

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“…In Ref. [399], Liu et al indicated that the mass thresholds for the pχ cJ (J = 0, 1, 2) are all close to the peak masses for the P + c (4450). Including these thresholds in their calculation, they found that the corresponding mass of the Λ * is larger than 2 GeV, which is in contrast with m(Λ * ) = 1.89 ∼ 2.11 GeV in Ref.…”

Section: Kinematical Effectmentioning

confidence: 85%

“…Thus, they concluded that the P + c (4450) can also be the kinematical effects around the χ c1 p threshold [397]. Later, Liu et al also investigated the possibility of the P c (4450) as kinematical effects [399] and considered three typical decay mechanisms which include (a) Λ b → Λ * χ cJ → K − pJ/ψ via exchanging a proton which is the same as one of the mechanisms proposed in Ref. [397]…”

Section: Kinematical Effectmentioning

confidence: 96%

“…In Refs. [397,398,399], these authors proposed various rescattering mechanisms to show that the narrow P c (4450) state might arise from the kinematical effect. Before reviewing these results, we note that the strength of this kinematical effect (singularity) can not be calculated due to the lack of knowledge on the relevant couplings.…”

Section: Kinematical Effectmentioning

confidence: 99%

“…Although both Guo et al [397] and Liu et al [399] studied similar issues of Λ b → Λ * χ cJ → K − pJ/ψ, there exist some difference. In Ref.…”

Section: Kinematical Effectmentioning

confidence: 99%

“…Liu et al further analyzed the second mechanism [399], and pointed out that there also exist the conditions required by the triangle singularity. When the Λ ( * ) [399] must be J P = 1/2 + , which does match the experimental measurement of the P c (4450) quantum number.…”

Section: Kinematical Effectmentioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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Section: Kinematical Effectmentioning

confidence: 85%

Section: Kinematical Effectmentioning

confidence: 96%

Section: Kinematical Effectmentioning

confidence: 99%

“…Although both Guo et al [397] and Liu et al [399] studied similar issues of Λ b → Λ * χ cJ → K − pJ/ψ, there exist some difference. In Ref.…”

Section: Kinematical Effectmentioning

confidence: 99%

Section: Kinematical Effectmentioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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Revisiting the nature of the Pc pentaquarks

Baru

Guo

et al. 2021

J. High Energ. Phys.

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The nature of the three narrow hidden-charm pentaquark Pc states, i.e., Pc(4312), Pc(4440) and Pc(4457), is under intense discussion since their discovery from the updated analysis of the process $$ {\Lambda}_b^0\to J/\psi {pK}^{-} $$ Λ b 0 → J / ψ pK − by LHCb. In this work we extend our previous coupled-channel approach [Phys. Rev. Lett. 124, 072001 (2020)], in which the Pc states are treated as $$ {\Sigma}_c^{\left(\ast \right)}{\overline{D}}^{\left(\ast \right)} $$ Σ c ∗ D ¯ ∗ molecules, by including the $$ {\Lambda}_c{\overline{D}}^{\left(\ast \right)} $$ Λ c D ¯ ∗ and ηcp as explicit inelastic channels in addition to the J/ψp, as required by unitarity and heavy quark spin symmetry (HQSS), respectively. Since inelastic parameters are very badly constrained by the current data, three calculation schemes are considered: (a) scheme I with pure contact interactions between the elastic, i.e., $$ {\Sigma}_c^{\left(\ast \right)}{\overline{D}}^{\left(\ast \right)} $$ Σ c ∗ D ¯ ∗ , and inelastic channels and without the $$ {\Lambda}_c{\overline{D}}^{\left(\ast \right)} $$ Λ c D ¯ ∗ interactions, (b) scheme II, where the one-pion exchange (OPE) is added to scheme I, and (c) scheme III, where the $$ {\Lambda}_c{\overline{D}}^{\left(\ast \right)} $$ Λ c D ¯ ∗ interactions are included in addition. It is shown that to obtain cutoff independent results, OPE in the multichannel system is to be supplemented with S-wave-to-D-wave mixing contact terms. As a result, in line with our previous analysis, we demonstrate that the experimental data for the J/ψp invariant mass distribution are consistent with the interpretation of the Pc(4312) and Pc(4440)/Pc(4457) as $$ {\Lambda}_c\overline{D} $$ Λ c D ¯ and $$ {\Sigma}_c{\overline{D}}^{\ast } $$ Σ c D ¯ ∗ hadronic molecules, respectively, and that the data show clear evidence for a new narrow state, Pc(4380), identified as a $$ {\Sigma}_c^{\ast}\overline{D} $$ Σ c ∗ D ¯ molecule, which should exist as a consequence of HQSS. While two statistically equally good solutions are found in scheme I, only one of these solutions with the quantum numbers of the Pc(4440) and Pc(4457) being JP = 3/2− and 1/2−, respectively, survives the requirement of regulator independence once the OPE is included. Moreover, we predict the line shapes in the elastic and inelastic channels and demonstrate that those related to the Pc(4440) and the Pc(4457) in the $$ {\Sigma}_c^{\left(\ast \right)}\overline{D} $$ Σ c ∗ D ¯ and ηcp mass distributions from $$ {\Lambda}_b^0\to {\Sigma}_c^{\left(\ast \right)}\overline{D}{K}^{-} $$ Λ b 0 → Σ c ∗ D ¯ K − and $$ {\Lambda}_b^0\to {\eta}_c{pK}^{-} $$ Λ b 0 → η c pK − will shed light on the quantum numbers of those states, once the data are available. We also investigate possible pentaquark signals in the $$ {\Lambda}_c{\overline{D}}^{\left(\ast \right)} $$ Λ c D ¯ ∗ final states.

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The Strong Decay Mode $$J/\psi $$ J / ψ for the Pentaquark States $$P_c^+(4380)$$ P c + ( 4380 ) and $$P_c^+(4450)$$ P c + ( 4450 ) in a $$\varSigma _c\bar{D}^*$$ Σ c D ¯ ∗ Molecular Scenario

Dong

Lü

2016

Few-Body Syst

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Understanding the newly observed heavy pentaquark candidates

Cited by 254 publications

References 35 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Revisiting the nature of the Pc pentaquarks

The Strong Decay Mode $$J/\psi $$ J / ψ for the Pentaquark States $$P_c^+(4380)$$ P c + ( 4380 ) and $$P_c^+(4450)$$ P c + ( 4450 ) in a $$\varSigma _c\bar{D}^*$$ Σ c D ¯ ∗ Molecular Scenario

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