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

Chinese Physics C 2013年第10期37卷 26-32页

作者：宋丽华刘娜段春贵 Department of Physics Hebei Normal University College of Science Hebei United University College of Mathematics and Physics Shijiazhuang University of Economics Hebei Advanced Thin Films Laboratory

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

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The dependence of J/ψ-nucleon inelastic cross section on the Feynman variable

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Chinese Physics C 2011年第9期35卷 804-807页

作者：段春贵刘娜苗文丹 Department of Physics Hebei Normal University Hebei Advanced Thin Films Laboratory CCAST(World Laboratory) P.O.Box 8730 College of Mathematics and Physics Shijiazhuang University of Economics

By means of two typical sets of nuclear parton distribution functions, meanwhile taking account of the energy loss of the beam proton and the nuclear absorption of the charmonium states traversing the nuclear matter in the uniform framework of the Glauber model, a leading order phenomenological analysis is given in the color evaporation model of the E866 experimental data on J/ψ production differential cross section ratios RFe/Be（XF）. It is shown that the energy loss effect of beam proton on RFe/Be（XF） is more important than the nuclear effects on parton distribution functions in the high Feynman variable XF region. It is found that the J/ψ-nucleon inelastic cross section depends on the Feynman variable xF and increases linearly with XF in the region XF 〉 0.2.

关键词： J/ψ production nuclear effect energy loss nuclear absorption

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