Photonuclear interaction of high energy muons and tau leptons
Photonuclear interaction of high energy muons and tau leptons
复制标题
高能μ子和tau轻子的光核相互作用
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Y. Shlepin
中科院分区：
文献类型：
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作者：
E. Bugaev;Y. Shlepin
提出了衍射区非弹性轻子-核子散射双分量描述的一般形式。用一个改进的广义矢量优势模型描述了对核子电磁结构函数的非微扰贡献，该模型包含了限制虚光子涨落初始$q\overline{q}$对相体积的特殊截止因子。摄动QCD的贡献由Forshaw， Kerley和Shaw提出的现象学模型（以非统一形式）来描述。给出了在${Q}^{2}$上积分的光核截面的数值计算公式。本文认为，对于在${Q}^{2},$上积分的超高能量轻子$(E\ensuremath{\gtrsim}{10}^{5}\mathrm{GeV}),$上的光核截面，以下双分量方案是足够好的：非微扰贡献由Bezrukov和Bugaev的旧参数化近似，微扰贡献由Forshaw， Kerley和Shaw的模型用DESY数据确定的参数来描述。给出了超高能量下$\ensuremath{\mu}A$和$\ensuremath{\tau}A$散射的微扰部分的数值计算结果。
The general formalism for the two-component description of inelastic lepton-nucleon scattering in the diffractive region is proposed. The nonperturbative contribution to electromagnetic structure functions of a nucleon is described by a modified generalized vector dominance model containing special cutoff factors restricting the phase volume of the initial $q\overline{q}$ pairs of the virtual photon's fluctuations. The perturbative QCD contribution is described by the phenomenological model suggested (in nonunitarized form) by Forshaw, Kerley, and Shaw. The formulas needed for a numerical calculation of the photonuclear cross sections integrated over ${Q}^{2}$ are presented. It is argued that in the case of photonuclear cross sections at superhigh energies of leptons $(E\ensuremath{\gtrsim}{10}^{5}\mathrm{GeV}),$ integrated over ${Q}^{2},$ the following two-component scheme is good enough: the nonperturbative contribution is approximated by the old parametrization of Bezrukov and Bugaev, and the perturbative one is described by the model of Forshaw, Kerley, and Shaw with the parameters determined from DESY data. The corresponding results of numerical calculations for the perturbative part are given, for the cases of $\ensuremath{\mu}A$ and $\ensuremath{\tau}A$ scattering at superhigh energies.