共查询到18条相似文献,搜索用时 125 毫秒
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在既考虑到泄漏在束缚核子外的海夸克与胶子间的重组,又考虑到仍束缚在核子内的部分子由于其禁闭空间的变化而发生的演化的基础上,给出了核内胶子分布函数的普遍形式,并具体计算了锡梭与碳核的胶子分布比,结果与NMC实验合作组的最新实验相一致. 相似文献
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利用夸克模型计算了核子的自旋相关结构函数随Q2的依赖关系.在小动量转移区研究高扭曲效应a2(Q2),d2(Q2)对结构函数的影响.计算结果和其它的一些模型理论计算做了比较. 相似文献
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Nuclear Effects in Structure Functions xFa(x, Q^2) from Charge Current Neutrino Deep Inelastic Scattering 下载免费PDF全文
By taking advantage of the model-independent nuclear parton distributions, the structure functions xF3(x, Q^2) are calculated, in comparison with the experimental data from CCFR neutrino-nuclei charge current deep inelastic scattering. It is shown that shadowing and anti-shadowing effects occur in valence quark distributions for small and medium x regions, respectively. It is suggested that the neutrino experimental data should be employed in the future for pinning down the nuclear patton distributions. 相似文献
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DONG Yu-Bing 《理论物理通讯》2005,43(4):695-698
By employing the parametrization form of the nucleon spin structure function
in the resonance region, which includes the contributions of the resonance
peaks and of nonresonance background, we study Bloom-Gilman quark-hadron
duality of g1 both in the inelastic resonance region and elastic one. 相似文献
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We discuss the nucleon spin structure function gl and the difference between the proton and neutrontargets gp1 - gn1 , based on quark model calculation. Quark-hadron duality for the nucleon spin structure function is alsoanalyzed. Effects of the △(1232) and Roper P11(1440) resonances on the spin structure function and on the differencegn1 - gn1 are mentioned. The results of different models for the Roper resonance are also addressed. 相似文献
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The instanton induced cross section in deep inelastic kinematics is a subject which people are tendentious to investigate it. Instanton induced contributions are well defined for the nucleon structure function. The non-perturbative contribution to the quark distributions of structure function, F2 (x, Q2 ), is considered within an instanton model for the QCD vacuum. We find that the structure function may possess numerically large non-perterbative contributions which are related to the violation of chirality and correspond to the correction of parton distribution of the leading twist. It is shown that the instantons give a negative contribution to the structure function at the NLO approximation. A comparison between our results, considering instantaon effect, and the case when we do not take this effect is done. Taking into account the instanton size, ρ, via the modified running coupling constant we get to a good agreement between our results at the NLO and NNLO approximations and the available experimental data, specially at the low values of the Bjorken variable x0.1 which confirms the validity of our calculations. 相似文献
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利用非相对论和相对论夸克模型分别计算了干涉截面对极化核子自旋结构函数的影响.计算所得到的明显的作用为今后实验上抽取核子自旋结构函数提供了依据. 相似文献
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The overlap and the leakage of the parton was considered so that the nucleon effective mass can be successfully used as the only free parameter to adjust the structure function ratios recently measured by NMC. 相似文献