Chinese Physics C > 2000, Vol. 24 > Issue(2): 131-139

Non-constancy and the Effect of Nuclear Environment of K-Factors in p-N(A) Drell-Yan Process

Department of Physics, Shandong University, Ji’nan 250100, China2 Department of Physics, Hebei Teacher′s University, Shijiazhuang 050016, China3 Department of Physics, Peking University, Beijing 100871, China

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Abstract：
Based on the next leading order (NLO) perturbative QCD calculation and adopted parton distribution functions from double Q ²rescaling model (DQ ²RM) in nuclei, we have discussed the variation of K-factors in p N(A) Drell-Yan process. Our results show that K-factors could not be treated as constants as usual, but are varied markedly with the kinimatic variable x _T(A). In the ISR and SppS energy regions, when 2×10 ^－3≤ x _T(A)<1, K-factors decrease markedly as x _T(A)becomes smaller, but after x _T(A)<2×10 ^－3, Their values increase rapidly as x _T(A)further decrease. K-factor has a little dependence on nucleon number A of a nuclei also, and their effects are more clear in small x _T(A)region. These observations are important for stringent test of some models and some physical quanties with Drell-Yan (Drell-Yan like) process in super high energy regions.

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LIU ChunXiu, HE ZhenMin, DUAN ChunGui and PENG HongAn. Non-constancy and the Effect of Nuclear Environment of K-Factors in p-N(A) Drell-Yan Process[J]. Chinese Physics C, 2000, 24(2): 131-139.

LIU ChunXiu, HE ZhenMin, DUAN ChunGui and PENG HongAn. Non-constancy and the Effect of Nuclear Environment of K-Factors in p-N(A) Drell-Yan Process[J]. Chinese Physics C, 2000, 24(2): 131-139. shu

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Received: 1998-12-02
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Non-constancy and the Effect of Nuclear Environment of K-Factors in p-N(A) Drell-Yan Process

Corresponding author:LIU ChunXiu,

Department of Physics, Shandong University, Ji’nan 250100, China2 Department of Physics, Hebei Teacher′s University, Shijiazhuang 050016, China3 Department of Physics, Peking University, Beijing 100871, China

Received Date:1998-12-02
Accepted Date:1900-01-01
Available Online:2000-02-05

Abstract:Based on the next leading order (NLO) perturbative QCD calculation and adopted parton distribution functions from double Q²rescaling model (DQ²RM) in nuclei, we have discussed the variation of K-factors in p N(A) Drell-Yan process. Our results show that K-factors could not be treated as constants as usual, but are varied markedly with the kinimatic variable x_T(A). In the ISR and SppS energy regions, when 2×10^－3≤ x_T(A)<1, K-factors decrease markedly as x_T(A)becomes smaller, but after x_T(A)<2×10^－3, Their values increase rapidly as x_T(A)further decrease. K-factor has a little dependence on nucleon number A of a nuclei also, and their effects are more clear in small x_T(A)region. These observations are important for stringent test of some models and some physical quanties with Drell-Yan (Drell-Yan like) process in super high energy regions.