Pentaquarks with hidden charm as hadroquarkonia

Michael I. Eides, Victor Yu Petrov, Maxim V. Polyakov

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

We consider hidden charm pentaquarks as hadroquarkonium states in a QCD inspired approach. Pentaquarks arise naturally as bound states of quarkonia excitations and ordinary baryons. The LHCb Pc(4450) pentaquark is interpreted as a ψ-nucleon bound state with spin-parity JP= 3 / 2 -. The partial decay width Γ(Pc(4450) → J/ ψ+ N) ≈ 11 MeV is calculated and turned out to be in agreement with the experimental data for Pc(4450). The Pc(4450) pentaquark is predicted to be a member of one of the two almost degenerate hidden-charm baryon octets with spin-parities JP= 1 / 2 -, 3 / 2 -. The masses and decay widths of the octet pentaquarks are calculated. The widths are small and comparable with the width of the Pc(4450) pentaquark, and the masses of the octet pentaquarks satisfy the Gell-Mann–Okubo relation. Interpretation of pentaquarks as loosely bound Σc and Σc∗D¯∗ deuteronlike states is also considered. We determine quantum numbers of these bound states and calculate their masses in the one-pion exchange scenario. The hadroquarkonium and molecular approaches to exotic hadrons are compared and the relative advantages and drawbacks of each approach are discussed.

Original languageEnglish
Article number36
JournalEuropean Physical Journal C
Volume78
Issue number1
DOIs
StatePublished - Jan 1 2018

Bibliographical note

Publisher Copyright:
© 2018, The Author(s).

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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