phi meson width in the medium from proton induced phi production in nuclei
phi meson width in the medium from proton induced phi production in nuclei
复制标题
质子诱导原子核中 phi 产生产生的介质中 phi 介子宽度
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
E. Oset
中科院分区：
文献类型：
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作者：
V. Magas;L. Roca;E. Oset
我们计算了能量略高于阈值的φ介子在核中的产生，并研究了截面的A依赖性。我们使用的结果中获得的介质中的φ自能的手征幺正方法。我们发现了与入射质子的畸变和出核过程中φ的吸收有关的强烈的A依赖性。后一个过程的影响使重核的截面减小了约2倍，证明了截面的A依赖性对核介质中的φ宽度有价值的信息。计算完成的能量可在一个实验设施，如COSY。
We perform calculations for the production of φ mesons in nuclei at energies just above threshold and study the A dependence of the cross section. We use results for the φ self-energy in the medium obtained within a chiral unitary approach. We find a strong A dependence which is tied to the distortion of the incident proton and to the absorption of the φ on its way out of the nucleus. The effect of this latter process reduces the cross section by about a factor of 2 in heavy nuclei, proving that the A dependence of the cross section bears valuable information on the φ width in the nuclear medium. Calculations are done for energies accessible in an experimental facility like COSY.