论文标题
接近阈值$ k^*（892）^+$ Meson生产$π^ - $ Meson与Nuclei的相互作用
Near-threshold $K^*(892)^+$ meson production in the interaction of $π^-$ mesons with nuclei
论文作者
论文摘要
我们研究了包含的奇怪矢量介子$ k^*（892）^+$ $ $ $ $ $ {π^ - }在核光谱函数方法中，在接近阈值实验室事件中的$反应为1.4---2.0 GEV/c。该方法以不一致的主要$π^ - $ MESON- $ {π^ - } p \ to {k^*（892）^+}σ^ - $生产过程以及标量$ k^*（892）^+$ - nucleus电位（或$ k^*（或$ k^*（892）^yim ships songium ships），$ k^*（892）的影响。我们计算出$ k^*（892）^+$梅森的绝对差异和总横截面，从碳和钨核从0 $^{\ circ} $ -45 $^{\ circ} $的实验室角度和钨核中，以及在这些时刻的五个场景中，在上面的五个场景中。我们表明，$ k^*（892）^+$动量分布及其激发功能（绝对和相对）对中等内部$ k^*（892）^+$ $ $质量的变化具有很高的敏感性。因此，在接近阈值动量域中的GSI翼梁设施的专用实验中测量了此类可观察物，将允许获取有关$ k^*（892）^+$ $ $ $ in-medium属性的有价值的信息。
We study the inclusive strange vector meson $K^*(892)^+$ production in ${π^-}A$ 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 $π^-$ meson--proton ${π^-}p \to {K^*(892)^+}Σ^-$ 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.
