Progress in the Determination of Polarized PDFs and Higher Twist

Details Progress in the Determination of Polarized PDFs and Higher Twist Progress in the Determination of Polarized PDFs and Higher Twist

2007-12-12

arxiv.org/abs/0712.1901v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 7 figures, to appear in the Proceedings of 12th Workshop on High Energy Spin Physics (DSPIN'07), Dubna, Russia, 3-7 S

Scientific paper

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.

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