COLOR TRANSPARENCY AND SCALING PROPERTIES OF NUCLEAR SHADOWING IN DEEP INELASTIC-SCATTERING

被引:733
作者
NIKOLAEV, NN
ZAKHAROV, BG
机构
[1] LD LANDAU THEORET PHYS INST,MOSCOW 117334,USSR
[2] MV LOMONOSOV STATE UNIV,NUCL PHYS RES INST,MOSCOW 117234,USSR
来源
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1991年 / 49卷 / 04期
关键词
D O I
10.1007/BF01483577
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We present the perturbative QCD analysis of nuclear shadowing in the deep inelastic scattering at small x in terms of the spatial wave function of qqBAR fluctuations of virtual photons. The wave function formalism makes it quite obvious that shadowing is the scaling, rather than the higher twist, 1/Q2, effect, contrary to a numerous recent claims. We demonstrate explicitly how the scaling shadowing comes from the large, hadronic, size quark-antiquark pairs even in the limit of Q2 --> infinity, and why it should very slowly, is proportional to 1/log(Q2/m2), decrease at very large Q2. We argue in favor of the scaling triple-pomeron contribution to the nuclear shadowing and present predictions for a cross section of diffraction dissociation of virtual photons and for the mass spectrum of diffraction excitation, which can be checked at HERA and Fermilab. We predict strikingly different scaling properties of diffraction dissociation and nuclear shadowing for the longitudinal and transverse photons. Our numerical predictions for shadowing are in good agreement with the recent EMC data.
引用
收藏
页码:607 / 618
页数:12
相关论文
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