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Paper IPM / Particles / 17546

School of Particles and Accelerator

Title:

Investigation of the strange pentaquark candidate

$P_{\psi s}^{\Lambda}(4338){}^0$ recently observed by LHCb

Author(s):

1.	K Azizi
2.	Y Sarac
3.	H Sundu

Status:

Published

Journal:

Phys. Rev. D

No.:

074010

Vol.:

108

Year:

2023

Supported by:

IPM

Abstract:

The recently observed strange pentaquark candidate,

$P_{\psi s}^{\Lambda}(4338){}^0$ , is investigated to provide information about its nature and substructure. To this end, its mass and width through the decay channels

$P_{\psi s}^{\Lambda}(4338){}^0 \rightarrow J/\psi \Lambda$ and

$P_{\psi s}^{\Lambda}(4338){}^0 \rightarrow \eta_c \Lambda$ are calculated by applying two- and three-point QCD sum rules, respectively. The state is considered as a

$\Xi_c\bar{D}$ meson-baryon molecular structure with spin-parity quantum numbers

$J^P=\frac{1}{2}^-$ . The obtained mass,

$m_{P_{\psi s}^{\Lambda}(4338){}^0}=4338\pm 130~\mathrm{MeV}$ , and width,

$\Gamma_{P_{\psi s}^{\Lambda}(4338){}^0}= 10.40\pm 1.93~\mathrm{MeV}$ , are consistent with the experimental data within the presented uncertainties. This allows us to assign a

$\Xi_c\bar{D}$ molecular structure of

$J^P=\frac{1}{2}^-$ for the

$P_{\psi s}^{\Lambda}(4338){}^0$ state.

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