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

Abstract

Recently the observation of a new pentaquark state, the hidden-charmed strange Pcs(4459) 0 , was reported by the LHCb Collaboration. The spin-parity quantum numbers of this state were not determined as a result of insufficient statistics. To shed light on its quantum numbers, we investigate its decay, Pcs(4459) 0 → J/ΨΛ, the mode that this state has been observed, within the QCD sum rule framework. We obtain the width of this decay assigning the spin-parity quantum numbers of Pcs(4459) 0 state as J P = 1 2 − and its substructure as diquark-diquark-antiquark. To this end, we first calculate the strong coupling constants defining the considered decay and then use them in the width calculations. The obtained width is consistent with the experimental observation, confirming the quantum numbers J P = 1 2 − and compact pentaquark nature for Pcs(4459) 0 state.

An updated review of the new hadron states

“…The diquark-diquark-antiquark configuration was used in Refs. [706,707,708] to investigate the P cs (4459). In Ref.…”

“…The authors of Ref. [708] studied the P cs (4459) → J/ψΛ decay also within the QCD sum rule framework, and calculated its partial decay width to be 15.87 ± 3.11 MeV.…”

Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules

“…Besides the molecular interpretation, there also exist other explanations such as the hadro-charmonium [324], compact pentaquark states [402,357]. There were intensive discussions of its production, decays and other properties [410,411,412]. Similar to the P c states, various partners of the P cs were also predicted in numerous theoretical works [398,407,397,409,413,404,395,414,397], which need to be examined by future experiments.…”

“…From Eqs. (410) or (411) we know that there are two orthogonal basis with η = +1 and −1, respectively. In the above investigations [298,297,299,305,323], the Z cs (3985) was assigned as the η = +1 state.…”

Analysis of the hidden-charm pentaquark molecular states with strangeness and without strangeness via the QCD sum rules

“…not necessary to be loosely bound, they can be compact objects and can lie below or above the corresponding meson-meson or meson-baryon pairs [9]. On the other hand, the P c (4312), P c (4380), P c (4440), P c (4457) and P cs (4459) can be the diquark-diquark-antiquark type or diquark-triquark type pentaquark states [10,11,12,13,14,15,16]. In Ref.…”