Study of the hidden-heavy pentaquarks and Pcs states

Abstract

Inspired by the recently observed resonance states PψsΛ(4338)0 and Pcs(4459)0 by LHCb Collaboration in J/ψΛ decay channel, we perform a systematical study of all possible hidden-heavy pentaquarks with strangeness S=0,−1,−2,−3, in unified framework of MIT bag model. The color-spin wave functions in terms of Young-Yamanouchi bases and transformed into baryon-meson couplings are utilized to calculate masses, magnetic moments, and relative partial widths of the hidden-heavy pentaquarks, suggesting that the observed PψsΛ(4338)0 is likely to be a 1/2− compact Pcs pentaquark, and the Pcs(4459)0 favors two-peak structure of 3/2− and 1/2− Pcs states. Our computation indicates that hidden-heavy pentaquarks have the masses around 4.35–4.90 GeV for the Pcs, 11.21–11.67 GeV for the Pbs, 4.73–5.02 GeV for the Pcss, and 11.54–11.77 GeV for the Pbss. Published by the American Physical Society 2024