Hidden-Bottom Pentaquarks
Gang Yang, Jialun Ping, Jorge Segovia

TL;DR
This study extends the analysis of pentaquark states to the hidden-bottom sector using a chiral quark model, predicting negative parity molecular-like bound states with larger binding energies than in the hidden-charm sector.
Contribution
The paper provides the first detailed theoretical investigation of hidden-bottom pentaquarks, exploring their possible quantum numbers, structures, and binding energies using an extended chiral quark model.
Findings
Negative parity hidden-bottom pentaquarks are predicted.
Molecular-type structures are favored with color-singlet configurations.
Hidden-color configurations lead to deeply bound states with larger binding energies.
Abstract
The LHCb Collaboration has recently reported strong evidences of the existence of pentaquark states in the hidden-charm baryon sector, the so-called and signals. Five-quark bound states in the hidden-charm sector were explored by us using, for the quark-quark interaction, a chiral quark model which successfully explains meson and baryon phenomenology, from the light to the heavy quark sector. We extend herein such study but to the hidden-bottom pentaquark sector, analyzing possible bound-states with spin-parity quantum numbers , and , and in the and isospin sectors. We do not find positive parity hidden-bottom pentaquark states; however, several candidates with negative parity are found with dominant baryon-meson structures . The calculated distances among any…
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