Nucleon resonances with hidden charm in 
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 reactions

Wu, Jia-Jun; Lee, T.-S. H.; Zou, B. S.

doi:10.1103/physrevc.100.035206

“…Indeed, the underlying physics of the AFCI discussed here is general and model independent. In the SM, we show the emergence of AFCI and QAHE in a two-orbital Hubbard model [31][32][33] realizable in cold atoms on optical lattices [34,35] where both the sublattice potential and SOI can be tuned optically [36][37][38]. Possible hosting 2D materials for the AFCI include the honeycomb lattice, noncentrosymmetric NiRuCl 6 with strong SOI [39] and the deposition of heavy atoms with strong SOI on insulating magnetic substrates such as MnTe [40] proposed recently by DFT calculations.…”

Section: Pacs Numbersmentioning

confidence: 94%

Antiferromagnetic Chern Insulators in Noncentrosymmetric Systems

Jiang

¹

,

Zhou

²

,

Dai

³

et al. 2018

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We investigate a new class of topological antiferromagnetic (AF) Chern insulators driven by electronic interactions in two-dimensional systems without inversion symmetry. Despite the absence of a net magnetization, AF Chern insulators (AFCI) possess a nonzero Chern number C and exhibit the quantum anomalous Hall effect (QAHE). Their existence is guaranteed by the bifurcation of the boundary line of Weyl points between a quantum spin Hall insulator and a topologically trivial phase with the emergence of AF long-range order. As a concrete example, we study the phase structure of the honeycomb lattice Kane-Mele model as a function of the inversion-breaking ionic potential and the Hubbard interaction. We find an easy z axis C=1 AFCI phase and a spin-flop transition to a topologically trivial xy plane collinear antiferromagnet. We propose experimental realizations of the AFCI and QAHE in correlated electron materials and cold atom systems.

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“…Using an effective Lagrangian approach, the photoproduction of these P c states is also investigated in Refs. [67][68][69] and it is suggested that higher precision experimental data are needed. Indeed, there is no evidence for the three P c resonances in the measurement of the γp → J=ψp cross section by the GlueX experiment [70] with not enough statistics, where the molecular model cannot be ruled out with the upper limits of the branching fractions of P c → J=ψp.…”

Section: Introductionmentioning

confidence: 99%

How to reveal the nature of three or more pentaquark states

Xiao

¹

,

Lu

²

,

Wu

³

et al. 2020

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Within the chiral unitary approach and with the constraints of heavy quark spin symmetry, we study the coupled channel interactions ofD ðÃÞ Σ ðÃÞ c channels, close to whose thresholds three pentaquarklike P c states have been reported by the LHCb Collaboration. In the present work, we take into account the contributions of pion exchanges via box diagrams to the interaction potentials, and therefore lift the degeneracy in the masses ofD Ã Σ ðÃÞ c spin multiplets. Fitting the J=ψp invariant mass distributions in the Λ 0 b → J=ψK − p decay, we find that the LHCb pentaquark states cannot be reproduced in the direct J=ψp production in the Λ 0 b decay, and can only be indirectly produced in the final state interactions of the Λ 0 b decay products,D ðÃÞ Σ ðÃÞ c , which further supports the nature of these states asD ðÃÞ Σ c molecules. Based on the fit results obtained, we study the partial decay widths/branching ratios to the other decay channels,D Ã Λ c ,DΛ c , and η c N, and the corresponding invariant mass distributions. The resonances with J P ¼ 1 2 − , P c ð4312Þ, P c ð4440Þ and the one ofD Ã Σ Ã c around 4500 MeV, have large partial decay width into η c N, and thus can be easily seen in the η c N invariant mass distributions. By contrast, the states with J P ¼ 3 2 − , P c ð4457Þ, the (predicted) narrow P c ð4380Þ, and the bound state ofD Ã Σ Ã c with a mass of about 4520 MeV do not decay into η c N. Therefore, the η c N channel should be studied in the future to provide further insights into the nature of these states, especially that of P c ð4440Þ and P c ð4457Þ.

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“…To explain these P c states, various theoretical interpretations were proposed, such as loosely-bound meson-baryon molecular states [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] and tightly-bound pentaquark states [39][40][41][42][43][44][45][46][47][48], etc. Since they have only been observed in the J/ψ p invariant mass spectrum by LHCb [3,4], it is crucial to search for some other decay channels in order to better understand their nature.…”

Section: Introductionmentioning

confidence: 99%

Decay properties of $$P_c$$ states through the Fierz rearrangement

Chen

¹

2020

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We systematically study hidden-charm pentaquark currents with the quark configurations $$[\bar{c} u][u d c]$$ [ c ¯ u ] [ u d c ] , $$[\bar{c} d][u u c]$$ [ c ¯ d ] [ u u c ] , and $$[\bar{c} c][u u d]$$ [ c ¯ c ] [ u u d ] . Some of their relations are derived using the Fierz rearrangement of the Dirac and color indices, and the obtained results are used to study strong decay properties of $$P_c$$ P c states as $$\bar{D}^{(*)} \varSigma _c$$ D ¯ ( ∗ ) Σ c hadronic molecules. We calculate their relative branching ratios for the $$J/\psi p$$ J / ψ p , $$\eta _c p$$ η c p , $$\chi _{c0} p$$ χ c 0 p , $$\chi _{c1} p$$ χ c 1 p , $$\bar{D}^{(*)0} \varLambda _c^+$$ D ¯ ( ∗ ) 0 Λ c + , $$\bar{D}^{0} \varSigma _c^{+}$$ D ¯ 0 Σ c + , and $$\bar{D}^{-} \varSigma _c^{++}$$ D ¯ - Σ c + + decay channels. We propose to search for the $$P_c(4312)$$ P c ( 4312 ) in the $$\eta _c p$$ η c p channel and the $$P_c(4440)/P_c(4457)$$ P c ( 4440 ) / P c ( 4457 ) in the $$\bar{D}^{0} \varLambda _c^+$$ D ¯ 0 Λ c + channel.

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Nucleon resonances with hidden charm in γp reactions

Abstract: PACS numbers: 25.20. Lj, 24.85.+p Typeset by REVT E X

Cited by 54 publications

References 112 publications

Antiferromagnetic Chern Insulators in Noncentrosymmetric Systems

Antiferromagnetic Chern Insulators in Noncentrosymmetric Systems

How to reveal the nature of three or more pentaquark states

Decay properties of $$P_c$$ states through the Fierz rearrangement

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