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Article
Report number	arXiv:1907.05322
Title	Five-flavor pentaquarks and other light- and heavy-flavor symmetry partners of the LHCb hidden-charm pentaquarks
Related title	Five-flavor pentaquarks and other light- and heavy-flavor symmetry partners of the LHCb hidden-charm pentaquarks
Author(s)	Peng, Fang-Zheng (Beihang U.) ; Liu, Ming-Zhu (Beihang U.) ; Pan, Ya-Wen (Beihang U.) ; Sánchez Sánchez, Mario (CENBG, Gradignan) ; Pavon Valderrama, Manuel (Beihang U.)
Publication	2022-10
Imprint	2019-07-11
Number of pages	21
Note	13 pages, 4 tables, corresponds to published version
In:	Nucl. Phys. B 983 (2022) 115936
DOI	10.1016/j.nuclphysb.2022.115936
Subject category	nucl-th ; Nuclear Physics - Theory ; hep-lat ; Particle Physics - Lattice ; hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	The discovery of three pentaquark peaks -- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$-- by the LHCb collaboration has a series of interesting consequences for hadron spectroscopy. If these hidden-charm objects are indeed hadronic molecules, as suspected, they will be constrained by heavy-flavor and SU(3)-flavor symmetries. The combination of these two symmetries will imply the existence of a series of five-flavor pentaquarks with quark content $\bar{b} c s d u$ and $b \bar{c} s d u$, that is, pentaquarks that contain each of the five quark flavors that hadronize. In addition, from SU(3)-flavor symmetry alone we expect the existence of light-flavor partners of the three $P_c$ pentaquarks with strangeness $S=-1$ and $S=-2$. The resulting structure for the molecular pentaquarks is analogous to the light-baryon octet -- we can label the pentaquarks as $P_{Q' \bar{Q}}^N$, $P_{Q' \bar{Q}}^{\Lambda}$, $P_{Q' \bar{Q}}^{\Sigma}$, $P_{Q' \bar{Q}}^{\Xi}$ depending on their heavy- and light-quark content (with $N$, $\Lambda$, $\Sigma$, $\Xi$ the member of the light-baryon octet to which the light-quark structure resembles and $Q'$, $\bar Q$ the heavy quark-antiquark pair). In total we predict $45$ new pentaquarks from heavy- and light-flavor symmetries alone, which extend up to $109$ undiscovered states if we also consider heavy-quark spin symmetry. If an isoquartet ($I={3/2}$) hidden-charm pentaquark is ever observed, this will in turn imply a second multiplet structure resembling the light-baryon decuplet: $P_{Q' \bar{Q}}^{\Delta}$, $P_{Q' \bar{Q}}^{\Sigma^*}$, $P_{Q' \bar{Q}}^{\Xi^*}$, $P_{Q' \bar{Q}}^{\Omega}$.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2022-2025 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

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