arXiv 2007.101922020-07-16nucl-thhep-phnucl-ex

$π^-$介子与核相互作用中的近阈$K^*(892)^+$介子产生

Near-threshold $K^*(892)^+$ meson production in the interaction of $π^-$ mesons with nuclei

E. Ya. Paryev

备注：: 16 pages, will be published in Chinese Physics C. arXiv admin note: text overlap with arXiv:1910.02755
DOI：: 10.1088/1674-1137/abae55

摘要：

用核谱函数方法研究了入射π介子动量为1.4- 2.0 GeV/c的近阈下${π^-}A$反应中奇异矢量介子$K^*(892)^+$的产生.该方法考虑了非相干初级$π^-$介子-质子${π^-}p \to {K^*(892)^+}Σ^-$的产生过程以及标量$K^*(892)^+$ -核势（或$K^*(892)^+$在介质中的质量移动）对这些过程的影响。我们计算了在实验室角为0 $^{\circ}$-45 $^{\circ}$的情况下，碳核和钨核产生$K^*(892)^+$介子的绝对微分截面和总截面.结果表明，在0.1- 0.6 GeV/c的低动量区，$K^*(892)^+$动量分布及其激发函数（绝对和相对）对介质中$K^*(892)^+$质量位移的变化具有很高的灵敏度。因此，在GSI的π介子束设施在近阈值动量域的专用实验中测量这样的可观测量将允许获得有价值的信息的$K^*(892)^+$在介质中的属性。

英文摘要：

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.

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