Pentaquarks with the $qqs\bar{Q}Q$ configuration in the Chiral Quark Model

Abstract

We study the five-quark system composed of qqs QQ configuration (q = u or d, Q = b or c), in the framework of the chiral quark model. In consequence, a series of bound states with heavy flavors are predicted by precise five-body dynamical calculations. We found that taking color-octet structure into consideration always provides more bounding energy than color-singlet structure, and the more heavier quark prevents, the easier to form the bound states. We suggest qqs bb configuration is a compact bb-pair surrounded by three other quarks, while qqs bc, qqscb and qqscc configurations are molecular states.

$P_{cs}(4459)$ and other possible molecular states from $Ξ_{c}^{(*)}\bar{D}^{(*)}$ and $Ξ'_c\bar{D}^{(*)}$ interactions

“…The partners of the hidden-charm pentaquarks were also widely discussed in the literature [30][31][32][33][34][35][36][37][38]. Replacing one of the light quark by strange quark, one can naturally obtain a strange hidden-charm pentaquark, which have been studied in the pioneer work [3] and some studies after the observation of P c states [39][40][41][42][43][44][45][46][47]. The observation of these partners is very helpful to understand the internal structure of the pentaquarks.…”

Investigation of $P_{cs}(4459)^0$ pentaquark via its strong decay to $ΛJ/Ψ$

“…They were also explained as kinematical effects [32][33][34][35][36]. Besides the observed ones, the possible other candidate pentaquark states were also considered in the literature with different quark contents [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Strong decays of the newly $P_{cs}(4459)$ as a strange hidden-charm $Ξ_c\bar{D}^*$ molecule

“…And the Ξ c D * and Ξ * c D systems are dominant. In fact, the hidden-charm pentaquarks with strangeness P cs were predicted [22][23][24][25][26][27][28][29][30][31], and suggested to search for in the Λ b (Ξ b ) → J/ψΛK(η) [26,27,32].…”