Photoproduction of pentaquark states at the LHC

Gonçalves, V. P.; Jaime, M. Medina

doi:10.1016/j.physletb.2020.135447

Cited by 18 publications

(17 citation statements)

References 46 publications

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“…A further study about the photoproduction of these pentaquark states at the RHIC and LHC can be found in Ref. [71], and the electroproduction in Refs. [72,73] at these and the future EicC (Electron-Ion Collider in China) facilities.…”

Section: Introductionmentioning

confidence: 99%

How to reveal the nature of three or more pentaquark states

Xiao

et al. 2020

Phys. Rev. D

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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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Section: Introductionmentioning

confidence: 99%

How to reveal the nature of three or more pentaquark states

Xiao

et al. 2020

Phys. Rev. D

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“…Photoproduction data would help elucidate the nature of these states (108)(109)(110). Pentaquarks may also be produced, via γ p → P (111). Jefferson Lab's GlueX experiment has recently put strong limits on photoproduction of cc-containing pentaquarks (112).…”

Section: Photoproduction Of Exotic Hadronsmentioning

confidence: 99%

Photonuclear and Two-Photon Interactions at High-Energy Nuclear Colliders

Klein

Steinberg

2020

Annu. Rev. Nucl. Part. Sci.

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Ultraperipheral collisions (UPCs) of heavy ions and protons are the energy frontier for electromagnetic interactions. Both photonuclear and two-photon collisions are studied at collision energies that are far higher than those available elsewhere. In this review, we discuss physics topics that can be addressed with UPCs, including nuclear shadowing, nuclear structure, and searches for physics beyond the Standard Model.

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“…Second, it is expected to be possible to extract from the quarkonium photoproduction cross section near threshold the quarkonium-hadron scattering length, which can be used to determine the J/ and ϒ binding energy in nuclear matter [31,33,36,51,52]. Finally, this process is an irreducible background for the searching of the P c and P b pentaquark states, predicted to be produced in photon-hadron interactions and to decay into the J/ p and ϒ p final states, respectively [53][54][55][56][57]. Recently, the GlueX Collaboration at Jefferson Laboratory (JLab) has reported its data for the photoproduction of J/ in ep scattering [58], with the new data for the threshold cross section being significantly different from the 40-yearold Cornell data and more data from JLab are expected in a near future.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs. [53,57], the photoproduction of pentaquark states in fixed target collisions at the LHC was investigated, and the results pointed out that a future experimental analysis of the P c and P b states is, in principle, feasible. However, in order to constrain the properties of these states, it is fundamental to have precise estimates of the exclusive vector meson photoproduction cross section at low energies, which is an irreducible background for the pentaquark photoproduction.…”

Section: Introductionmentioning

confidence: 99%

Near threshold heavy vector meson photoproduction at LHC and EicC

Xie

Gonçalves

2021

Eur. Phys. J. C

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The exclusive $$J/\Psi $$ J / Ψ and $$\Upsilon $$ Υ photoproduction in fixed - target collisions at the LHC and ep(A) collisions at the Electron ion collider in China (EicC) is investigated considering different models for the treatment of the vector meson production at low energies, close to the threshold. Results for the total cross sections and associated distributions are presented. We predict a large number of $$J/\Psi $$ J / Ψ events at the LHC in the rapidity range covered by the LHCb detector. For the EicC, our predictions point out that a detailed analysis of the near threshold $$J/\Psi $$ J / Ψ and $$\Upsilon $$ Υ photoproduction is feasible. Moreover, our results indicate that the modeling of the near threshold vector meson production can be constrained by future experimental analyzes at the LHC and EicC.

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Photoproduction of pentaquark states at the LHC

Cited by 18 publications

References 46 publications

How to reveal the nature of three or more pentaquark states

How to reveal the nature of three or more pentaquark states

Photonuclear and Two-Photon Interactions at High-Energy Nuclear Colliders

Near threshold heavy vector meson photoproduction at LHC and EicC

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