arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0710.0124hep-ph
收藏

轻子-核子从高到低动量转移的非弹性散射模型

Modeling Lepton-Nucleon Inelastic Scattering from High to Low Momentum Transfer

S. Alekhin, S. A. Kulagin, R. Petti

摘要:

本文提出了一个动量转移平方下的带电轻子-核子和(反)中微子-核子碰撞截面模型$Q^2$,$\sim1 {\rm GeV}^2$。我们量化现有的低Q带电轻子深度非弹性散射(DIS)数据的影响,由于高扭曲运营商和提取的部分子分布函数(PDF)。没有证据表明扭转6贡献的结构功能(SF),并为扭转4长期的logstick SF在$x\gtrsim0.1$。我们发现,DIS数据是一致的与NNLO QCD近似的目标质量和唯象高扭曲修正。对于$Q^2<1 {\rm GeV}^2$,我们扩展外推的算子乘积展开,保持低$Q$电流守恒定理。该过程对低至$Q^2\sim 0.5 {\rm GeV}^2$的数据进行了良好的描述。得到了一组更新的PDF,减少了不确定性,并适用于小动量转移的轻子-核子散射。

英文摘要:

We present a model for inclusive charged lepton-nucleon and (anti)neutrino-nucleon cross sections at momentum transfer squared, $Q^2$, $\sim1 {\rm GeV}^2$. We quantify the impact of existing low-Q charged-lepton deep-inelastic scattering (DIS) data on effects due to high-twist operators and on the extraction of parton distribution functions (PDFs). No evidence is found for twist-6 contributions to structure functions (SF), and for a twist-4 term in the logitudinal SF at $x\gtrsim0.1$. We find that DIS data are consistent with the NNLO QCD approximation with the target mass and phenomenological high twist corrections. For $Q^2<1 {\rm GeV}^2$, we extend extrapolation of the operator product expansion, preserving the low-$Q$ current-conservation theorems. The procedure yields a good description of data down to $Q^2\sim 0.5 {\rm GeV}^2$. An updated set of PDFs with reduced uncertainty and applicable down to small momentum transfers in the lepton-nucleon scattering is obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑