Quark energy loss in semi-inclusive deep inelastic scattering of leptons on nuclei

被引：13
作者：
Song, Li-Hua [1 ,2 ,3 ]
Duan, Chun-Gui [1 ,2 ]
机构：
[1] Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China
[2] Hebei Adv Thin Films Lab, Shijiazhuang 050016, Peoples R China
[3] Hebei Polytech Univ, Coll Informat, Tangshan 063009, Peoples R China
来源：
PHYSICAL REVIEW C | 2010年 / 81卷 / 03期
基金：
中国国家自然科学基金;
关键词：
HADRON-PRODUCTION; FRAGMENTATION; DISTRIBUTIONS; ATTENUATION; TARGETS; MODEL;
D O I：
10.1103/PhysRevC.81.035207
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Semi-inclusive deep inelastic scattering on nuclear targets is an ideal tool to study the energy loss effect of an outgoing quark in a nuclear medium. By means of the short hadron formation time, the experimental data with quark hadronization occurring outside the nucleus are picked out. A leading-order analysis is performed for the hadron multiplicity ratios as a function of the energy fraction on helium, neon, and copper nuclei relative to deuteron for the various identified hadrons. It is shown that the nuclear effects on parton distribution functions can be neglected. It is found that the theoretical results considering the nuclear modification of fragmentation functions due to quark energy loss are in good agreement with the experimental data. Whether the quark energy loss is linear or quadratic with the path length is not determined. The obtained energy loss per unit length is 0.38 +/- 0.03 GeV/fm for an outgoing quark by the global fit.
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页数：7
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