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arXiv 2407.10491hep-ph
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小Bjorken $x$处螺旋度对质子自旋之谜的贡献

Contribution to the Proton Spin Puzzle from Helicity at small Bjorken $x$

Yossathorn Tawabutr

AI总结:

针对小Bjorken $x$区域质子自旋研究中初始条件自由参数多、预测不确定性大的问题,研究提出在极化质子靶中采用价夸克模型替换多数自由参数,以优化小$x$螺旋度演化的全局分析。

摘要:

小Bjorken $x$区域夸克与胶子自旋对质子螺旋度的贡献,可通过小$x$螺旋度演化便捷开展研究。近期,该演化方法被应用于一项全局分析中,分析纳入了小$x$区域的极化单举与半单举深度非弹性散射测量数据。分析结果显示,演化结果与数据吻合度极佳,但由于初始条件中自由参数数量较多,其预测结果存在较大不确定性。最新研究进展旨在缓解这一问题:通过在极化质子靶中采用价夸克模型,用质子模型提供的物理信息替换初始条件中的大部分自由参数。

英文摘要:

The contribution to proton helicity from the spins of quarks and gluons at small Bjorken $x$ can be conveniently studied through the small-$x$ helicity evolution. Recently, it has been employed in a global analysis that includes polarized inclusive and semi-inclusive deep-inelastic scattering measurements at small $x$. The analysis demonstrates an excellent agreement between the evolution and the data, but its predictions contain large uncertainties owing to the large number of free parameters in the initial conditions. The latest development aims to mitigate this issue by employing the valence quark model in the polarized proton target in order to replace most of the free parameters in the initial conditions by the physical information from the proton model.

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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