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Antikaon-induced K1(1270)+ meson production on nuclei near threshold
Nuclear Physics A ( IF 1.4 ) Pub Date : 2021-01-04 , DOI: 10.1016/j.nuclphysa.2020.122133
E.Ya. Paryev

We study the inclusive strange axial-vector meson K1(1270)+ production in KA reactions at near-threshold laboratory incident antikaon momenta within a nuclear spectral function approach, which describes incoherent direct K1(1270)+ meson production in K meson–proton KpK1(1270)+Ξ production processes and accounts for three different options for its in-medium mass shift (or for its effective scalar potential) at central density ρ0. We calculate the absolute differential and total cross sections for the production of K1(1270)+ mesons on 12C and 184W target nuclei at laboratory angles of 045 by K mesons with momenta of 2.5, 2.8 and 3.5 GeV/c, which are close to the threshold momentum (≈ 2.95 GeV/c) for K1(1270)+ meson production off the free target proton at rest. The intrinsic properies of carbon and tungsten target nuclei have been described in terms of their spectral functions, which take into account the momenta of target protons and the energies of their separation from the considered nuclei. We show that the differential and total (absolute and relative) K1(1270)+ antikaon-induced production cross sections at initial momenta not far from threshold – at momenta ∼ 2.8–3.5 GeV/c, at which there is yet no strong drop in their strength, reveal a distinct sensitivity to changes in the in-medium shift of the K1(1270)+ mass, studied in the paper, both in the K1(1270)+ meson low-momentum (0.1–1.0 GeV/c) and in its full-momentum ranges. This would permit evaluating this shift. Experimental data necessary for this aim can be obtained in a dedicated experiment at the J-PARC Hadron Experimental Facility.



中文翻译:

Antikaon诱导的K 1(1270)+介子在接近阈值的核上产生

我们研究了包容性奇轴矢量介子 ķ1个1270+ 生产中 ķ-一种 核谱函数方法中接近阈值的实验室入射反钾动量的反应,描述了非相干直接 ķ1个1270+ 介子生产 ķ- 介子质子 ķ-pķ1个1270+Ξ- 生产过程,并为中心密度下的中等质量转移(或有效标量势)提供了三种不同的选择 ρ0。我们计算生产的绝对微分和总横截面ķ1个1270+12 C和184 W目标原子核的介子在实验室角为045 通过 ķ- 介子的动量分别为2.5、2.8和3.5 GeV / c,接近于阈值动量(≈2.95 GeV / c) ķ1个1270+介子在静止时释放自由目标质子。碳和钨靶核的固有性质已根据其光谱函数进行了描述,其中考虑了靶质子的动量和它们与所考虑核的分离能量。我们证明了微分和总数(绝对和相对)ķ1个1270+ 在最初的时刻,抗钾诱导的生产截面距阈值不远–在大约2.8–3.5 GeV / c处,此时强度没有显着下降,显示出对钾的中位移的明显敏感性。 ķ1个1270+ 质量,在本文中进行了研究,均在 ķ1个1270+介子低动量(0.1–1.0 GeV / c),并处于全动量范围。这将允许评估此转变。为此目的所需的实验数据可以在J-PARC强子实验设施的专用实验中获得。

更新日期:2021-01-04
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