用Paschos-Wolfenstein关系提取$sin^2θ_W$时核介质和非等尺度效应的影响
Effects of nuclear medium and nonisoscalarity in extracting $sin^2θ_W$ using Paschos-Wolfenstein relation
摘要：
利用Paschos-Wolfenstein（PW）关系研究了在提取弱混合角sin $^2θ_W$中的核介质效应和非等标度修正。计算是针对铁核进行的。结果进行了讨论，随着NuTeV合作推断的实验结果。计算中考虑了费米运动、束缚、遮蔽和反遮蔽修正以及π介子云和ρ介子云的贡献等核介质效应。在局域密度近似下，采用包含核子关联的相对论核谱函数进行了计算。这些研究可能对正在进行的MINER $ν$ A实验以及拟议的NuSOnG实验有用。
英文摘要：
We study the nuclear medium effects and nonisoscalarity correction in the extraction of weak mixing angle sin$^2θ_W$ using Paschos-Wolfenstein (PW) relation. The calculations are performed for the iron nucleus. The results are discussed along with the experimental result inferred by NuTeV collaboration. The nuclear medium effects like Fermi motion, binding, shadowing and antishadowing corrections and pion and rho meson cloud contributions have been taken into account. Calculations have been performed in the local density approximation using a relativistic nuclear spectral function which includes nucleon correlations. These studies may be useful for the ongoing MINER$ν$A experiment as well as for the proposed NuSOnG experiment.
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