Double-hadron leptoproduction in the nuclear medium.
Double-hadron leptoproduction in the nuclear medium.
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DOI：
10.1103/physrevlett.96.162301
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发表时间：
2005-10
影响因子：
8.6
通讯作者：
T. H. C. A. Airapetian;et al.
中科院分区：
文献类型：
--
作者：
T. H. C. A. Airapetian;et al.
DESY HERA 的 HERMES 能谱仪使用 27.6 GeV 正电子束首次测量了核介质内深非弹性散射中双强子的产生。通过比较氘、氮、氪和氙核的数据，研究了核介质对双强子与单强子产率之比的影响。可以清楚地观察到对附加强子的核效应，但氮、氪或氙之间几乎没有差异，并且其幅度比之前测量的单强子多重性的效应要小。将数据与基于部分能量损失或前强子散射的模型以及基于最终状态相互作用的纯吸收处理的模型进行比较。因此，双强子比率为研究核物质强子化的变化提供了额外的工具。
The first measurements of double-hadron production in deep-inelastic scattering within the nuclear medium were made with the HERMES spectrometer at DESY HERA using a 27.6 GeV positron beam. By comparing data for deuterium, nitrogen, krypton, and xenon nuclei, the influence of the nuclear medium on the ratio of double-hadron to single-hadron yields was investigated. Nuclear effects on the additional hadron are clearly observed, but with little or no difference among nitrogen, krypton, or xenon, and with smaller magnitude than effects seen on previously measured single-hadron multiplicities. The data are compared with models based on partonic energy loss or prehadronic scattering and with a model based on a purely absorptive treatment of the final-state interactions. Thus, the double-hadron ratio provides an additional tool for studying modifications of hadronization in nuclear matter.