# Partial decay widths of $P_{c}(4312)$ as a $\bar{D}\Sigma_{c}$ molecular state

## TL;DR

This paper investigates the decay widths of the pentaquark state $P_{c}(4312)$ assuming it is a $ar{D}\Sigma_{c}$ molecular state, using QCD sum rules to estimate partial decay widths consistent with experimental data.

## Contribution

It provides the first QCD sum rule calculation of the partial decay widths of $P_{c}(4312)$ as a $ar{D}\Sigma_{c}$ molecular state, supporting its molecular interpretation.

## Key findings

- Partial decay widths are estimated as 5.54 MeV for $ar{D}\Sigma_{c}$ to $\eta_{c} p$.
- Partial decay width to $J/\psi p$ is estimated as 1.67 MeV.
- Results are compatible with the experimental total width of $P_{c}(4312)$.

## Abstract

In the present work, the partial decay widths of $P_{c}(4312)$ to $\eta_{c} p$ and $J/\psi p$ are investigated with the QCD sum rule method under the assumption that $P_{c}(4312)$ is a $\bar{D}\Sigma_{c}$ molecular state with $J^{P}=\frac{1}{2}^{-}$. In the analysis, the pole residue of $P_{c}(4312)$, one of the input parameters for the calculations of the strong decay constants, is calculated first. With the numerical values of the strong decay constants, the partial decay widths to $\eta_{c} p$ and $J/\psi p$ are estimated to be $\Gamma(P_{c}(4312)\rightarrow \eta_{c} p)=5.54^{+0.75}_{-0.5}\mbox{MeV}$ and $\Gamma(P_{c}(4312)\rightarrow J/\psi p)=1.67^{+0.92}_{-0.56}\mbox{MeV}$, respectively, which are compatible with the measured total width of $P_{c}(4312)$. The results suggest that it is reasonable to assign $P_{c}(4312)$ to be a $\bar{D}\Sigma_{c}$ molecular state with $J^{P}=\frac{1}{2}^{-}$.