Pentaquarks and resonances in the $pJ/ψ$ spectrum

V. V. Anisovich; M. A. Matveev; J. Nyiri; A. V. Sarantsev; A. N. Semenova

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arXiv · 1507.07652

Pentaquarks and resonances in the $pJ/ψ$ spectrum

V. V. Anisovich·M. A. Matveev·J. Nyiri·A. V. Sarantsev·A. N. Semenova

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Abstract

We consider exotic baryons with hidden charm as antiquark-diquark-diquark composite systems. Spin and isospin structure of such exotic states is given and masses are estimated. The data for production of pentaquarks in the reaction $Λ_b\to K^-p J/ψ$ are discussed. We suggest that the narrow peak in $pJ/ψ$ spectra at 4450 MeV is antiquark-diquark-diquark state with negative parity, $5/2^{-}(4450)$, while the broad bump $3/2^{+}(4380)$ is the result of rescatterings in the ($pJ/ψ$)-channel. Positions of other pentaquarks with negative parity are estimated.

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V. V. Anisovich, M. A. Matveev, J. Nyiri, A. V. Sarantsev, A. N. Semenova. 2015-07-28. Pentaquarks and resonances in the $pJ/ψ$ spectrum. https://arxiv.org/abs/1507.07652

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