Production potential of hidden-strange molecular pentaquarks through the $\pi^-p\rightarrow K^{*}\Sigma$ process

TL;DR

This paper investigates the production of hidden-strange molecular pentaquarks in the  reaction using an effective Lagrangian approach, predicting cross sections and encouraging experimental searches at facilities like J-PARC.

Contribution

It introduces a theoretical analysis of hidden-strange pentaquark production in  reactions, highlighting the dominance of s-channel exchange and providing differential cross section predictions.

Findings

s-channel  exchange dominates the cross section

Predicted cross section can reach tens of  near threshold

Encourages experimental measurement at facilities like J-PARC

Abstract

In this study, applying the effective Lagrangian approach, we investigate the reaction $\pi^-p\rightarrow K^{*}\Sigma$ to explore the production of the hidden-strange molecular pentaquarks $P_{s\bar{s}}$. Specifically, we analyze two scenarios, where the $J^P$ quantum numbers of $P_{s\bar{s}}$ are $3/2^-$ and $1/2^-$. Our results show that the contribution from $s$-channel $P_{s\bar{s}}$ exchange dominates the total cross section, surpassing those from $t$-channel $K^{(*)}$ exchange and $u$-channel $\Sigma$ exchange. Additionally, we present predictions for the differential cross section of the $\pi^-p\rightarrow K^{*}\Sigma$ process. Finally, we extend the 2-to-2 scattering process to the 2-to-3 Dalitz process and provide theoretical predictions for this scenario. Our findings suggest that the cross section for the $\pi^-p \rightarrow K^{*}\Sigma\rightarrow K^+\pi^-\Sigma^0$ process can reach several tens of $\mu b$ near the threshold, making it highly favorable for experimental measurement. However, the current scarcity of experimental data for the $\pi^-p\rightarrow K^{*}\Sigma$ reaction at threshold energy limits our ability to determine the properties of the hidden-strange molecular pentaquarks $P_{s\bar{s}}$ and related physical quantities. Therefore, additional experimental measurements of the $\pi^-p \rightarrow K^{*}\Sigma$ reaction at threshold are strongly encouraged, and correlation studies could be pursued at facilities such as J-PARC, AMBER, and upcoming HIKE and HIAF meson beam experiments.