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arXiv 1405.7854nucl-exhep-ex
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高精度测定$Q^2$ -Bjorken和的演变

High precision determination of the $Q^2$-evolution of the Bjorken Sum

A. Deur, Y. Prok, V. Burkert, D. Crabb, F. -X. Girod, K. A. Griffioen, N. Guler, S. E. Kuhn, N. Kvaltine

备注：
Published in Phys. Rev. D. V1: 8 pages, 3 figures. V2: Updated references; Included threshold matching in α_s evolution. Corrected a typo on the uncertainty for Λ_QCD. V3: Published version
发表信息：
Phys. Rev. D 90, 012009 (2014)
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摘要：

我们提出了一个显着改进的测定Bjorken和0.6 $\leq Q^{2}\leq$ 4.8 GeV $^{2}$使用精确的新$g_{1}^{p}$和$g_{1}^{d}$数据采取CLAS探测器在杰斐逊实验室。对比约肯和的$Q^{2}$依赖性的更高扭曲分析产生扭曲-4系数$f_{2}^{p-n}=-0.064 \pm0.009\pm_{0.036}^{0.032}$。这导致颜色极化率$χ_{E}^{p-n}=-0.032\pm0.024$和$χ_{B}^{p-n}=0.032\pm0.013$。强耦合力被确定为$α_{s}^{\overline{\mbox{ MS}}}(M_{Z}^{2})=0.1124\pm0.0061$，它的不确定性比以前使用极化DIS数据的估计值小1.5倍。这一改进使得从偏振DIS中提取的$α_{s}$与其它技术的比较成为QCD的一个有价值的检验。

英文摘要：

We present a significantly improved determination of the Bjorken Sum for 0.6$\leq Q^{2}\leq$4.8 GeV$^{2}$ using precise new $g_{1}^{p}$ and $g_{1}^{d}$ data taken with the CLAS detector at Jefferson Lab. A higher-twist analysis of the $Q^{2}$-dependence of the Bjorken Sum yields the twist-4 coefficient $f_{2}^{p-n}=-0.064 \pm0.009\pm_{0.036}^{0.032}$. This leads to the color polarizabilities $χ_{E}^{p-n}=-0.032\pm0.024$ and $χ_{B}^{p-n}=0.032\pm0.013$. The strong force coupling is determined to be $α_{s}^{\overline{\mbox{ MS}}}(M_{Z}^{2})=0.1124\pm0.0061$, which has an uncertainty a factor of 1.5 smaller than earlier estimates using polarized DIS data. This improvement makes the comparison between $α_{s}$ extracted from polarized DIS and other techniques a valuable test of QCD.

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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