Interpretation of the newly observed 
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 resonances

Wang, Wei; Zhu, Ruilin

doi:10.1103/physrevd.96.014024

Cited by 96 publications

(69 citation statements)

References 62 publications

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“…= 120 possible permutations if all five states are P -wave excitations of the ss diquark with respect to the charmed quark. Some more recent calculations [2][3][4][5][6] that appeared after the first version of this paper reach the same conclusion. In parentheses we note an alternative assignment if the two heaviest states are 2S excitations.…”

Section: Introductionsupporting

confidence: 63%

“…(The last paper treats only 2S levels, identifying the states at 3066, 3119 MeV as candidates for J P = 1/2 + , 3/2 + , respectively. In addition, simultaneously with or after the first version of the present paper, there appeared works which also identified the five observed Ω c states as 1P excitations of the (ss) diquark with respect to the charmed quark [2][3][4][5][6], and interpretations based on pentaquarks [28][29][30].) The authors of Ref.…”

Section: Alternative Interpretationsmentioning

confidence: 99%

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Very narrow excited Ωc baryons

2017

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Recently LHCb reported the discovery of five extremely narrow excited Ω c baryons decaying into Ξ + c K − . We interpret these baryons as bound states of a c-quark and a P -wave ss-diquark. For such a system there are exactly five possible combinations of spin and orbital angular momentum. The narrowness of the states could be a signal that it is hard to pull apart the two s-quarks in a diquark. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all with negative parity. Of the five states two can decay in S-wave and three can decay in D-wave. Some of the D-wave states might be narrower than the S-wave states. We discuss relations among the five masses expected in the quark model and the likely spin assignments and compare with the data. A similar pattern is expected for negative-parity excited Ω b states. An alternative interpretation is noted in which the heaviest two states are 2S excitations with J P = 1/2 + and 3/2 + , while the lightest three are those with J P = 3/2 − , 3/2 − , 5/2 − expected to decay via D-waves. In this case we expect J P = 1/2 − Ω c states around 2904 and 2978 MeV.PACS codes: 12.39. Jh, 13.20.Jf, 13.25.Jx, 14.40 The proposed values of spin-parity J P are ours. An alternative set of assignments is shown in parentheses.State Mass (MeV) a Width (MeV) Proposed J P Ω c (3000) 0 3000.4 ± 0.2 ± 0.1 4.5 ± 0.6 ± 0.3 1/2 − (3/2 − ) Ω c (3050) 0 3050.2 ± 0.1 ± 0.1 0.8 ± 0.2 ± 0.1 1/2 − (3/2 − ) < 1.2 MeV, 95% CL Ω c (3066) 0 3065.6 ± 0.1 ± 0.3 3.5 ± 0.4 ± 0.2 3/2 − (5/2 − ) Ω c (3090) 0 3090.2 ± 0.3 ± 0.5 8.7 ± 1.0 ± 0.8 3/2 − (1/2 + ) Ω c (3119) 0 3119.1 ± 0.3 ± 0.91.1 ± 0.8 ± 0.4 5/2 − (3/2 + ) < 2.6 MeV, 95% CL a Additional common error of +0.3,-0.5 MeV from M (Ξ + c ) uncertainty. I IntroductionVery recently LHCb reported the discovery of five extremely narrow excited Ω c baryons decaying into Ξ + c K − [1], with masses and widths shown in Table I. We quote also our favored spin-parity assignment for these states, which we shall choose among the 5! = 120 possible permutations if all five states are P -wave excitations of the ss diquark with respect to the charmed quark. Some more recent calculations [2-6] that appeared after the first version of this paper reach the same conclusion. In parentheses we note an alternative assignment if the two heaviest states are 2S excitations.This discovery raises some immediate questions, which we address in detail: In Sec. II we comment on P -wave css baryons. We then analyze spin-dependent forces for the css system in Sec. III, building upon similar results [7] obtained previously for the negative-parity Σ c states. We evaluate the energy cost for a P -wave css excitation in Sec. IV, carry our results over to the Ω b system in Sec. V, discuss alternative interpretations of the spectrum in Sec. VI, and conclude in Sec. VII. Details of calculating the spin-dependent mass shifts are presented in Appendix A, with a linearized approximation in Appendix B.II P -wave c(ss) system Consider the (ss) in c(ss) to be an S-wave color3 c diquark....

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Section: Introductionsupporting

confidence: 63%

Section: Alternative Interpretationsmentioning

confidence: 99%

Very narrow excited Ωc baryons

2017

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“…While one may also expect that the next-to-lowest state in our model may correspond for the observed Ω c (3000) 0 , since once the values of coupling strength constants for Goldstone boson exchange are taken to be 0.9 times of the ones given in [19,21,22], the resulting energy for the next-to-lowest state is 2980 MeV, while the three higher states almost keep as what they are. The Ω 0 c resonances have also been investigated by using various of quark models [7,8,10,12,16] since the observation by LHCb collaboration. In [7,8,16], the Ω 0 c states are interpreted as system with one diquark and one charm quark, and the parities for all the five observed states are assigned to be negative, but with different spin quantum numbers.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The Ω 0 c resonances have also been investigated by using various of quark models [7,8,10,12,16] since the observation by LHCb collaboration. In [7,8,16], the Ω 0 c states are interpreted as system with one diquark and one charm quark, and the parities for all the five observed states are assigned to be negative, but with different spin quantum numbers.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Consequently, observation of the five states is of significant importance for us to understand structure of the Ω states with narrow width lying at ∼ 3000 MeV, and what kind of structure of these states should be. In fact, just after the LHCb announcement, various of theoretical investigations on the structure and quantum numbers of Ω 0 c resonances have been done, using the QCD sum rule method [3][4][5][6], quark-diquark picture [7][8][9], chiral quark model [10,11], constituent quark model [12], lattice QCD [13], chiral quark-soliton model [14], and in several very recent works, the decay behaviours of the observed Ω 0 c are also investigated [15][16][17]. On the other hand, one may notice that two hidden charm pentaquark states have been announced by LHCb collaboration in 2015 [18], one of these two states also has narrow decay width.…”

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confidence: 99%

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Observed Ωc0 resonances as pentaquark states

Chen

2017

Phys. Rev. D

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In present work, we investigate the spectrum of several low-lying sscqq pentaquark configurations employing the constituent quark model, within which the hyperfine interaction between quarks is taken to be mediated by Goldstone boson exchange. Our numerical results show that four sscqq configurations with J P = 1/2 − or J P = 3/2 − lie at energies very close to the recently observed five Ω 0 c states by LHCb collaboration, this indicates that the sscqq pentaquark configurations may form sizable components of the observed Ω 0 c resonances.

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The Molecular Nature of Some Exotic Hadrons

Ramos

Feijoo²,

Llorens

et al. 2020

Few-Body Syst

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The exciting discovery by LHCb of the P c (4312) + and P c (4450) + pentaquarks, or the suggestion of a tetraquark nature for the Z c (3900) state seen at BESIII and Belle, have triggered a lot of activity in the field of hadron physics, with new experiments planned for searching other exotic mesons and baryons, and many theoretical developments trying to disentangle the true multiquark nature from their possible molecular origin. After a brief review of the present status of these searches, this paper focusses on recently seen or yet to be discovered exotic heavy baryons that may emerge from a conveniently unitarized meson-baryon interaction model in coupled channels. In particular, we will show how interferences between the different coupled-channel amplitudes of the model may reveal the existence of a N * resonance around 2 GeV having a meson-baryon quasi-bound state nature. We also discuss the possible interpretation of some of the Ω c states recently discovered at LHCb as being hadron molecules. The model also predicts the existence of doublycharmed quasibound meson-baryon Ξ cc states, which would be excited states of the ground-state Ξ cc (3621) MeV, whose mass has only been recently established. Extensions of these results to the bottom sector will also be presented. Composite Hadrons: A Brief ReviewThe basic constituents of matter in QCD are quarks and gluons. Although hadrons, the colourless objects of the theory, could be realized in many complicated combinations of the elementary constituents, the conventional

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Interpretation of the newly observed Ωc0 resonances

Abstract: We study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in S wave and thus their total spin is 1. We calculate the mass spectra of the S and P wave orbitally excited states and find the Ω 0 c (

Cited by 96 publications

References 62 publications

Very narrow excited Ωc baryons

Very narrow excited Ωc baryons

Observed Ωc0 resonances as pentaquark states

The Molecular Nature of Some Exotic Hadrons

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