Understanding of the BESIII measurement of (anti)hyperon-nucleon scattering

Abstract

Focusing on the recent measurements of the scattering processes $\bar{\Lambda }p\to \bar{\Lambda }p$ and $\Lambda p\to \Lambda p$ reported by BESIII, we offer a dynamical interpretation of the differences in the measured total and differential cross sections for both processes. This discrepancy arises because the $u$-channel contribution is forbidden for $\bar{\Lambda }p\to \bar{\Lambda }p$ but allowed for $\Lambda p\to \Lambda p$. Additionally, we examine the enhancement effect in the forward angle region of the differential cross section for $\bar{\Lambda }p$ elastic scattering, attributed to the $t$-channel contribution. This work serves as a test to the scattering mechanism involved in these reactions.

Comments: 4 pages, 4 figures, 1 tables