Dynamically generated resonances from the vector octet-baryon octet interaction

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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“…[283,284,285,286,287] for the case of three flavors, and was extended to the case of four flavors in Refs. [249,250], where…”

Section: Dynamically Generated Resonancementioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…The extension of the local hidden gauge approach to the baryon sector for the interaction of vector mesons with baryons has also been tackled: the interaction of vector mesons with the decuplet of baryons is studied in [23] and with the octet of baryons in [24]. In both cases some dynamically generated resonances are obtained which can be associated to reported resonances in the PDG [25].…”

Section: Introductionmentioning

confidence: 99%

Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons

2013

Self Cite

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We present a coupled channel unitary approach to obtain states dynamically generated from the meson baryon interaction with hidden charm, using constraints of heavy quark spin symmetry. We use as basis of states,DB,D * B states, with B baryon charmed states belonging to the 20 representations of SU(4) with J P = 1/2 + , 3/2 + . In addition we also include the η c N and J/ψN states. The inclusion of these coupled channels is demanded by heavy quark spin symmetry, since in the large m Q limit the D and D * states are degenerate and are obtained from each other by means of a spin rotation, under which QCD is invariant. The novelty in the work is that we use dynamics from the extrapolation of the local hidden gauge model to SU(4) and we show that this dynamics fully respects the constraints of heavy quark spin symmetry.With the full space of states demanded by the heavy quark spin symmetry and the dynamics of the local hidden gauge we look for states dynamically generated and find four basic states which are bound, corresponding toDΣ c ,DΣ * c ,D * Σ c andD * Σ * c , decaying mostly into η c N and J/ψN . All the states appear in isospin I = 1/2 and we find no bound states or resonances in I = 3/2. TheDΣ c state appears in J = 1/2, theDΣ * c in J = 3/2, theD * Σ c appears nearly degenerate in J = 1/2, 3/2 and theD * Σ * c appears nearly degenerate in J = 1/2, 3/2, 5/2, with the peculiarity that in J = 5/2 the state has zero width in the space of states chosen. All the states are bound with about 50 MeV with respect to the correspondingDB thresholds and the width, except for the J = 5/2 state, is also of the same order of magnitude.

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“…To estimate the uncertainties, we compare two approaches to this implementation, since they differ in size and energy dependence: In Refs. [19,20], vector mesons are introduced through the Hidden Local Symmetry (HLS) approach, where the tree level vector-meson nucleon scattering amplitudes are obtained from a vector-meson exchange mechanism; In Ref. [21], it is obtained within an SU(6) spin-flavor symmetry extension of chiral perturbation theory.…”

Section: Formalismmentioning

confidence: 99%

In-Medium Properties of the ϕ Meson with ϕ N Resonant Contributions

Cabrera¹,

Blin²,

Vacas³

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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Nuclear production experiments report missing absorption processes of the in-medium ϕ meson. Contributions arising from theKK cloud have already been widely studied, and therefore we investigate the ϕ-meson's properties in cold nuclear matter with the additional inclusion of resonant ϕ N interactions. Two models are considered which dynamically generate N * -like states close to the ϕ N threshold. We find that these states, together with the non-resonant part of the amplitude, contribute to the ϕ self-energy with the same order of magnitude as theKK effects. At non-vanishing nuclear density, both models lead to an additional in-medium broadening of the ϕ, up to around 50 MeV. Furthermore, at least one of the models is compatible with a mass shift to lower energies of up to 35 MeV at threshold and normal matter density. Finally, a double-peak structure appears in the spectral function due to the mixing of resonance-hole modes with the ϕ quasi-particle peak. These results converge into the direction of the experimental findings.

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Dynamically generated resonances from the vector octet-baryon octet interaction

Cited by 198 publications

References 68 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons

In-Medium Properties of the ϕ Meson with ϕ N Resonant Contributions

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