Doubly-strange hidden-charm pentaquarks from the Fermi statistics of the light-quark cloud
EUROPEAN PHYSICAL JOURNAL C, cilt.86, sa.8, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 86 Sayı: 8
- Basım Tarihi: 2026
- Doi Numarası: 10.1140/epjc/s10052-026-16178-x
- Dergi Adı: EUROPEAN PHYSICAL JOURNAL C
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO), Technology Collection (ProQuest)
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Ondokuz Mayıs Üniversitesi Adresli: Evet
Özet
We extend the baryo-charmonium picture of pentaquarks - a color-octet cc & strns; core bonded to a color-octet light-quark cloud - to the doubly-strange sector cc & strns;ssq . The mass splittings are set entirely by the light cloud, so the only new inputs are the strange-strange couplings Jss , fixed by a second application of the chromomagnetic scaling, and an additive strange-mass increment taken from the observed Pc -> Pcs shift. We obtain two negative-parity triplets, one produced with a kaon and one with an antiproton, the lowest kaon-associated 12- state near 4.60 GeV and the antiproton-associated triplet some 120 MeV below. The robust, distinctive prediction is that the upper two kaon-associated states form a near-degenerate doublet, in sharp contrast to the well-separated triplets of the lighter sectors - a sparse, fixed-spacing pattern that sets the scheme apart from the molecular and diquark alternatives. The internal splittings follow without adjustment from the measured Pc and Pcs spectra; the absolute scale relies on the additive strange-mass ansatz, the main assumption of the extrapolation. The predicted masses agree with recent molecular coupled-channel and QCD sum-rule results.