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J/ψΛ femtoscopy and the nature of PψsΛ(4338)

Yi-Bo Shen and Zhi-Wei Liu

Ming-Zhu Liu*

Rui-Xiang Shi, Chu-Wen Xiao, and Wei-Hong Liang

Li-Sheng Geng†

  • School of Physics, Beihang University, Beijing 102206, China; Sino-French Carbon Neutrality Research Center, École Centrale de Pékin/School of General Engineering, Beihang University, Beijing 100191, China; Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 102206, China; and Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou 516000, China

  • *Contact author: liumz@lzu.edu.cn
  • †Contact author: lisheng.geng@buaa.edu.cn
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Phys. Rev. D 113, 074034 – Published 29 April, 2026

DOI: https://doi.org/10.1103/rnsq-c7j6

Abstract

Over the past two decades, numerous exotic hadron states have been discovered, yet their underlying nature remains unclear. It is widely acknowledged that understanding hadron-hadron interactions is essential to unraveling their properties. Hadron spectroscopy is a powerful tool for this endeavor, providing rich experimental data that can shed light on exotic systems. Recently, the LHCb experiment analyzed the process B−→J/ψΛp¯ and observed a narrow peak in the J/ψΛ invariant mass spectrum, regarding it as a candidate for a pentaquark. In this work, we extract the coupled-channel J/ψΛ−D¯Ξc−D¯sΛc potential based on the J/ψΛ invariant mass spectrum. Our results indicate the existence of a bound state below the D¯Ξc mass threshold, corresponding to the experimentally measured state Pcs(4338). Furthermore, we predict the scattering lengths and momentum correlation functions for the J/ψΛ and D¯Ξc channels, which serve as theoretical references for future femtoscopy experiments.

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Phys. Rev. D 113, 074034– Published 29 April, 2026
  • Received 20 January 2026
  • Accepted 2 April 2026
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