Hadron formation in semi-inclusive deep inelastic lepton-nucleus scattering  

作　　者：宋丽华 刘娜 段春贵 

机构地区：[1]Department of Physics,Hebei Normal University [2]College of Science,Hebei United University [3]College of Mathematics and Physics,Shijiazhuang University of Economics [4]Hebei Advanced Thin Films Laboratory

出　　处：《Chinese Physics C》2013年第10期26-32,共7页中国物理C（英文版）

基　　金：National Natural Science Foundation of China (11075044);Natural Science Foundation of Hebei Province (A2008000137)

摘　　要：Hadron production in lepton-nucleus deep inelastic scattering is studied in a model including quark energy loss and nuclear absorption. The leading-order computations for hadron multiplicity ratios are presented and compared with the selected HERMES experimental data with the quark hadronization occurring inside the nucleus by means of the hadron formation time. It is shown that with increase of the energy fraction carried by the hadron, the nuclear suppression on hadron multiplicity ratio from nuclear absorption gets bigger. It is found that when hadronization occurs inside the nucleus, the nuclear absorption is the dominant mechanism causing a reduction of the hadron yield. The atomic mass dependence of hadron attenuation for quark hadronization starting inside the nucleus is confirmed theoretically and experimentally to be proportional to A1/3.Hadron production in lepton-nucleus deep inelastic scattering is studied in a model including quark energy loss and nuclear absorption. The leading-order computations for hadron multiplicity ratios are presented and compared with the selected HERMES experimental data with the quark hadronization occurring inside the nucleus by means of the hadron formation time. It is shown that with increase of the energy fraction carried by the hadron, the nuclear suppression on hadron multiplicity ratio from nuclear absorption gets bigger. It is found that when hadronization occurs inside the nucleus, the nuclear absorption is the dominant mechanism causing a reduction of the hadron yield. The atomic mass dependence of hadron attenuation for quark hadronization starting inside the nucleus is confirmed theoretically and experimentally to be proportional to A1/3.

关 键 词：deep inelastic scattering NUCLEI nuclear absorption hadron production 

分 类 号：O572.3[理学—粒子物理与原子核物理] O572.2[理学—物理]