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arXiv 1005.3113hep-phhep-exhep-lat
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极化深部非弹性散射数据的QCD分析

QCD Analysis of Polarized Deep Inelastic Scattering Data

Johannes Blümlein, Helmut Böttcher

摘要:

本文用QCD方法分析了极化深度非弹性散射的世界数据,包括固定味数方案中首阶的重味Wilson系数。导出了夸克和胶子分布的新参数化,并确定了$α_s(M_z^2)$的值。研究了重整化标度和因子化标度的变化对$α_s$分布和值的影响。我们得到了$α_s^{\rm NLO}(M_Z^2) = 0.1132~~\begin{array}{l} + 0.0056 \\ -0.0095 \end{array}$。计算了极化扭转2部分子分布函数的一阶矩,并与格点量子色动力学模拟的结果进行了比较。潜在的更高的扭曲的结构功能$g_1(x,Q^2)$的贡献被确定,并发现是兼容的质子和氘的目标与零。

英文摘要:

A QCD analysis of the world data on polarized deep inelastic scattering is presented in next--to--leading order, including the heavy flavor Wilson coefficient in leading order in the fixed flavor number scheme. New parameterizations are derived for the quark and gluon distributions and the value of $α_s(M_z^2)$ is determined. The impact of the variation of both the renormalization and factorization scales on the distributions and the value of $α_s$ is studied. We obtain $α_s^{\rm NLO}(M_Z^2) = 0.1132~~\begin{array}{l} + 0.0056 \\ -0.0095 \end{array}$. The first moments of the polarized twist--2 parton distribution functions are calculated with correlated errors to allow for comparisons with results from lattice QCD simulations. Potential higher twist contributions to the structure function $g_1(x,Q^2)$ are determined and found to be compatible with zero both for proton and deuteron targets.

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。

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