Exploration of charmed pentaquarks

Gerasyuta, S. M.; Kochkin, V. I.; Liu, Xiang

doi:10.1103/physrevd.91.054037

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…However some experimental searches on pentaquarks still came into view with null results such as the result of ALICE Collaboration investigating φ(1869) pentaquark [64] and J-PARC E19 Collaboration searching for Θ + [65] state. On the other hand the theoretical studies indicated that the search on the pentaquark containing heavy quark constituents is still necessary [66] due to the effect of such a structure on the stability of the hadronic structures beyond the traditional hadrons [67]. In 2015 the observation of two pentaquark states, P + c (4380) and P + c (4450), was finally reported by LHCb Collaboration in the Λ 0 b → J/ψK − p decays.…”

Section: Introductionmentioning

confidence: 99%

Analysis of $P_c^+(4380)$ and $P_c^+(4450)$ as pentaquark states in the molecular picture with QCD sum rules

Azizi,

Sarac,

Sundu

2016

Preprint

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To better understand the nature and internal structure of the exotic states discovered by many collaborations, more information on their electromagnetic properties and their strong and weak interactions with other hadrons is needed. The residue or current coupling constant of these states together with their mass are the main inputs in determinations of such properties. We perform QCD sum rules analyses on the hidden-charm pentaquark states with spin-parities J P = 3 2 ± and J P = 5 2 ± to calculate their residue and mass. In the calculations, we adopt a molecular picture for± states and a mixed current in a molecular form for J P = 5 2 ± . Our analyses show that the P + c (4380) and P + c (4450), observed by LHCb Collaboration, can be considered as hidden-charm pentaquark states with J P = 3 2 − and J P = 5 2 + , respectively.

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Section: Introductionmentioning

confidence: 99%

Analysis of $P_c^+(4380)$ and $P_c^+(4450)$ as pentaquark states in the molecular picture with QCD sum rules

Azizi,

Sarac,

Sundu

2016

Preprint

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“…In 2013 with the observation of Z c [30], being an indication for the existence of pentaquark, the attentions have centered upon pentaquarks again. While there still were some null results coming from experimental researches such as the results of ALICE Collaboration investigating φ(1869) pentaquark [31] and J-PARC E19 Collaboration searching for Θ + [32], the theoretical studies were indicating necessity for searching the pentaquark states with heavy quark contents [33]. Finally there came the long sought result from the LHCb Collaboration with the announcement of the observation of P + c (4380) and P + c (4450), in the Λ 0 b → J/ψK − p decay with masses 4380 ± 8 ± 29 MeV and 4449.8 ± 1.7 ± 2.5 MeV, spins 3/2 and 5/2 and decay widths 205 ± 18 ± 86 MeV and 39 ± 5 ± 19 MeV, respectively [1].…”

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confidence: 99%

Strong decay of P(4380) pentaquark in a molecular picture

2018

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There are different assumptions on the substructure of the pentaquarks Pc(4380) and Pc(4450), newly founded in J/ψN invariant mass by the LHCb collaboration, giving consistent mass results with the experimental observations. The experimental data and recent theoretical studies on their mass suggest interpretation of these states as spin-3/2 negative-parity and spin-5/2 positive-parity pentaquarks, respectively. There may exist opposite-parity states corresponding to these particles, as well. Despite a lot of studies, however, the nature and internal organization of these pentaquarks in terms of quarks and gluons are not clear. To this end we need more theoretical investigations on other physical properties of these states. In this accordance, we study a strong and dominant decay of the Pc(4380) to J/ψ and N in the framework of three point QCD sum rule method. An interpolating current in a molecular form is applied to calculate six strong coupling form factors defining the transitions of the positive and negative parity spin-3/2 pentaquark states. The values of the coupling constants are used in the calculation of the decay widths of these transitions. The obtained results are compared with the existing experimental data.

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“…Mesonbaryon molecules have been suggested in [22][23][24][25][26][27][28][29][30]. Pentaquark states of diquark-diquark-antiquark nature have been suggested in [31][32][33][34][35], compact diquark-triquark pentaquarks in [36,37],D-soliton states in [38], genuine multiquark states in [39,40], and some papers have suggested that the peaks could be related to kinematic effects of a triangle singularity [41][42][43]. Summaries of the theoretical and experimental work done can be seen in Refs.…”

Section: Introductionmentioning

confidence: 99%

On the hidden charm pentaquarks in $$\Lambda _b \rightarrow J/\psi K^- p$$ Λ b → J / ψ K - p decay

Roca

Oset

2016

Eur. Phys. J. C

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In a previous work we presented a theoretical analysis of the b → J/ψ K − p reaction based on which a recent experiment by the LHCb collaboration at CERN claimed the existence of two hidden charm pentaquarks, P c (4380) + and P c (4450) + . In that work we focused only on the (1405) and P c (4450) + signals and discussed the possible explanation of this pentaquark state within the picture of a dynamical meson-baryon molecule made up mostly fromD * c andD * * c components. In the present work we improve upon the previous one by considering the total K − p and J/ψ p data including all the relevant resonances contributing to the spectra, and discuss the possible nature of both P c (4380) + and P c (4450) + . We also discuss several important topics, like the effect of the contact term in the reaction, the viability of reproducing the data without the P c (4380) + and the possible quantum number assignment to these pentaquarks.

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Exploration of charmed pentaquarks

Cited by 4 publications

References 40 publications

Analysis of $P_c^+(4380)$ and $P_c^+(4450)$ as pentaquark states in the molecular picture with QCD sum rules

Analysis of $P_c^+(4380)$ and $P_c^+(4450)$ as pentaquark states in the molecular picture with QCD sum rules

Strong decay of P(4380) pentaquark in a molecular picture

On the hidden charm pentaquarks in $$\Lambda _b \rightarrow J/\psi K^- p$$ Λ b → J / ψ K - p decay

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