COHERENCE LENGTH AND NUCLEAR SHADOWING FOR TRANSVERSE AND LONGITUDINALPHOTONS

Fizika B (Zagreb)

JRG RAUFEISEN¹ 

关键词: nuclear shadowing;    photons;    light-cone Green function technique;    deepinelastic scattering;   

DOI  :  

学科分类：物理（综合）

来源: Fizika B: a journal of experimental and theoretical physics

【 摘 要 】

We study nuclear shadowing for transverse and longitudinal photons. The coherencelength, which controls the onset of nuclear shadowing at small Bjorken-x, x_Bj, is longer for longitudinal than for transverse photons. Thelight-cone Green function technique properly treats the finite coherence length in allmultiple scattering terms. This is especially important in the region x_Bj>0.01, where most of the data exist. NMC data on shadowingin deep inelastic scattering are well reproduced in this approach. We also incorporatenonperturbative effects, in order to extrapolate this approach to small photonvirtualities Q², where perturbative QCD cannot be applied. This way, we achievea description of shadowing that is based only on quark and gluon degrees of freedom, evenat low Q².

【 授权许可】

Unknown