2025/08/23 by Hao-Nan Wang, Cheng Chen, Wang, Hao-Nan +10
#hep-ph
paper · pdf · doi:10.48550/arxiv.2508.16912
Based on the effective Lagrangian approach, we investigate the p p → ΛΛ 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 p → ΛΛ at threshold.