标题： 双$φ$介子产生与$\bar{p}p$散射 显示英文标题

标题： Double $φ$-meson production via $\bar{p}p$ scattering

摘要： 我们利用有效拉格朗日方法研究了近阈区 $\bar{p}p$ 反应中的双 $\phi$ 生产，通过强子过程突显出明显的 OZI 规则违背现象。 我们的模型包含了来自核子的$t$- 和$u$- 通道贡献，以及$s$波$N^*$共振（$N^*(1535,1650,1895)$）和五夸克态$P_s(2071)$的贡献。 在$s$通道中，引入了标量（$f_0$）、张量（$f_2$）和赝标量（$\eta(2225)$）介子。 $N$、$N^*$、$f_0$和$f_2$的贡献增强了截面，并在$W=2.2$GeV 附近产生了峰结构，与 JETSET 数据一致，而尖峰结构则来自$\bar{\Lambda}\Lambda$和$\bar{\Sigma}\Sigma$阈值的开启。极化可观测量（如自旋密度矩阵元 SDME）进一步阐明了潜在的强子机制。 显示英文摘要

摘要： We investigate double $\phi$ production in $\bar{p}p$ reactions near threshold using an effective Lagrangian approach, highlighting a significant OZI rule violation through hadronic processes. Our model includes $t$- and $u$-channel contributions from the nucleon and $s$-wave $N^*$ resonances ($N^*(1535,1650,1895)$), as well as the pentaquark-like state $P_s(2071)$. In the $s$-channel, scalar ($f_0$), tensor ($f_2$), and pseudoscalar ($\eta(2225)$) mesons are incorporated. The $N$, $N^*$, $f_0$, and $f_2$ contributions enhance the cross-section and generate peak structures near $W=2.2$ GeV, consistent with JETSET data, while cusp structures arise from $\bar{\Lambda}\Lambda$ and $\bar{\Sigma}\Sigma$ threshold openings. Polarization observables, such as the spin density matrix element (SDME), further elucidate the underlying hadronic mechanisms.