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Near-threshold $K^*(892)^+$ meson production in the interaction of $\pi^-$ mesons with nuclei
Chinese Physics C ( IF 3.6 ) Pub Date : 2020-10-29 , DOI: 10.1088/1674-1137/abae55
E. Ya. Paryev 1, 2
Affiliation  

We study the inclusive strange vector meson $K^*(892)^+$ production in ${\pi^-}A$ reactions at near-threshold laboratory incident pion momenta of 1.4--2.0 GeV/c within a nuclear spectral function approach. The approach accounts for incoherent primary $\pi^-$ meson--proton ${\pi^-}p \to {K^*(892)^+}\Sigma^-$ production processes as well as the influence of the scalar $K^*(892)^+$--nucleus potential (or the $K^*(892)^+$ in-medium mass shift) on these processes. We calculate the absolute differential and total cross sections for the production of $K^*(892)^+$ mesons off carbon and tungsten nuclei at laboratory angles of 0$^{\circ}$--45$^{\circ}$ and at these momenta within five scenarios for the above shift. We show that the $K^*(892)^+$ momentum distributions and their excitation functions (absolute and relative) possess a high sensitivity to changes in the in-medium $K^*(892)^+$ mass shift in the low-momentum region of 0.1--0.6 GeV/c. Therefore, the measurement of such observables in a dedicated experiment at the GSI pion beam facility in the near-threshold momentum domain will allow to get valuable information on the $K^*(892)^+$ in-medium properties.

中文翻译:

$\pi^-$介子与原子核相互作用中的近阈值$K^*(892)^+$介子产生

我们研究了在接近阈值实验室入射 pion 动量为 1.4--2.0 GeV/c 的核谱函数内 ${\pi^-}A$ 反应中包含的奇异矢量介子 $K^*(892)^+$ 的产生方法。该方法考虑了不相干的初级 $\pi^-$ 介子--质子 ${\pi^-}p \to {K^*(892)^+}\Sigma^-$ 生产过程以及这些过程中的标量 $K^*(892)^+$--核势(或 $K^*(892)^+$ 介质中的质量转移)。我们计算了在实验室角度 0$^{\circ}$--45$^{\circ} 下碳和钨核产生 $K^*(892)^+$ 介子的绝对微分和总横截面$ 以及在上述转变的五个场景中的这些时刻。我们表明 $K^*(892)^+$ 动量分布及其激发函数(绝对和相对)对介质中 $K^*(892)^+$ 质量转移的变化具有高度敏感性。 0.1--0.6 GeV/c 的低动量区。因此,在近阈值动量域中的 GSI π 梁设施的专用实验中测量此类可观测值将允许获得有关 $K^*(892)^+$ 介质特性的宝贵信息。
更新日期:2020-10-29
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