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arXiv 0712.1901hep-phhep-ex
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偏振PDF和高扭曲度的测定进展

Progress in the Determination of Polarized PDFs and Higher Twist

Elliot Leader, Alexander V. Sidorov, Dimiter B. Stamenov

摘要:

最近非常精确的CLAS和COMPASS G1/F1数据的极化部分子密度和更高的扭曲效应的影响进行了讨论。结果表明,低Q^2 CLAS数据从本质上改进了我们对自旋结构函数g1的高扭曲修正的认识,而大Q^2 COMPASS数据主要影响奇异夸克和胶子极化。它还表明,在确定的极化部分子密度的不确定性显着降低。我们还发现,目前包含DIS数据不能排除负极化和变化的符号胶子密度。讨论了质子自旋和规则的现状。

英文摘要:

The impact of the recent very precise CLAS and COMPASS g1/F1 data on polarized parton densities and higher twist effects is discussed. It is demonstrated that the low Q^2 CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g1, while the large Q^2 COMPASS data influence mainly the strange quark and gluon polarizations. It is also shown that the uncertainties in the determination of the polarized parton densities are significantly reduced. We find also that the present inclusive DIS data cannot rule out a negative polarized and changing in sign gluon densities. The present status of the proton spin sum rule is discussed.

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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