Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum

Dong, Xiang-Kun; Guo, Feng-Kun; Zou, Bing-Song

doi:10.1103/physrevlett.126.152001

Cited by 104 publications

(50 citation statements)

References 66 publications

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“…We label the D * + D 0 as the channel-1 and the higher D * 0 D + as the channel-2. We adopt a coupled-channel effective field theory proposed by Cohen et al [39], which is well used to investigate the coupled-channel effect in the hadron physics [40][41][42]. In effective field theory, we introduce the leading order interaction…”

Section: Coupling Constants From the Residuals Of T -Matrixmentioning

confidence: 99%

Probing the long-range structure of the $T_{cc}^+$ with the strong and electromagnetic decays

Meng,

Wang,

Wang

et al. 2021

Preprint

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Very recently, the LHCb Collaboration reported the doubly charmed tetraquark state T + cc blow the D * + D 0 threshold about 273 keV. As a very near-threshold state, its long-distance structure is very important. In the molecular scheme, we investigate the kinetic allowed strong decays T + cc → D 0 D 0 π + , T + cc → D + D 0 π 0 and radiative decays D + D 0 γ, which are sensitive to the long-range structure of T + cc . In a coupled-channel effective field theory, we extract the coupling constants of T + cc to D * 0 D + and D * + D 0 channels from the residuals of the T -matrix. Due to the low-energy universality, the coupling constants only depend on the binding energy. With the coupling constants and the strong and radiation vertices of D * meson from experiments, we give the strong and radiative decay widths of T + cc . Our predictions can be used to test the inner structure of T + cc state.

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Section: Coupling Constants From the Residuals Of T -Matrixmentioning

confidence: 99%

Probing the long-range structure of the $T_{cc}^+$ with the strong and electromagnetic decays

Meng,

Wang,

Wang

et al. 2021

Preprint

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“…Also, it was shown in ref. [60] based on an EFT, if the system contains only two channels, that a dip must appear near the elastic threshold in the inelastic line shape if the elastic-channel interaction is strongly attractive and the production process goes dominantly through inelastic channels. On the other hand, data in the production channels driven by elastic channels should have a near-threshold peak.…”

Section: Jhep08(2021)157mentioning

confidence: 99%

“…[58] is smooth. 2 A strong threshold cusp effect normally requires the existence of a near-threshold pole in an unphysical Riemann sheet (RS) [11,59,60].…”

Section: Introductionmentioning

confidence: 99%

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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“…Moreover, the quasi-degeneracy between the newly observed Z cs (3985) and Z cs (4000) could be reproduced within tetraquark frame [72]. Considering the mass of Z cs (3985) is very close to the threshold of D − s D * 0 , it is natural to propose that Z cs (3985) as D ( * ) s D( * ) molecular state [67,68,70,[73][74][75][76][77][78][79]. However, the calculation from one-boson-exchange (OBE) model do not support a pure hadronic molecular state and there are large compact components in Z cs [80].…”

Section: Introductionmentioning

confidence: 79%

Exploration of the hidden charm decays of $Z_{cs}(3985)$

Wu¹,

Chen²

2021

Preprint

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In the present work, we investigate the decays of Z − cs (3985) in the D − s D * 0 + D * − s D 0 molecular frame. By using an effective Lagrangian approach, the branching ratios of Z − cs → J/ψK − and Z − cs → η c K * − are estimated. It is found that the dominating decay mode of Z − cs ( 3985) is open charm channel, while, the branching ratio of the hidden charm decay channels is about 20%. In particular, the branching ratios of Z − cs → J/ψK − and Z − cs → η c K * − are predicted to be of order of 10%. Moreover, our estimation indicates that the fraction of the quasi-two-body cascade decay via Z cs (3985) and the total cross section of e + e − → K + K − J/ψ around 4.68 GeV is 6.8 +10.5 −6.2 %. All the predicted branching ratios in the present work could be tested by further measurements in BESIII and Belle II.

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Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum

Cited by 104 publications

References 66 publications

Probing the long-range structure of the $T_{cc}^+$ with the strong and electromagnetic decays

Probing the long-range structure of the $T_{cc}^+$ with the strong and electromagnetic decays

Revisiting the nature of the Pc pentaquarks

Exploration of the hidden charm decays of $Z_{cs}(3985)$

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