Polarized Parton Densities and Higher Twist in the Light of the Recent CLAS and COMPASS data

Details Polarized Parton Densities and Higher Twist in the Light of the Recent CLAS and COMPASS data Polarized Parton Densities and Higher Twist in the Light of the Recent CLAS and COMPASS data

2007-07-10

arxiv.org/abs/0707.1373v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, typo in Ref. 8 corrected, to appear in the Proceedings of the 15th International Workshop on Deep-Inelasti

Scientific paper

The impact of the recent very precise CLAS and COMPASS g_1/F_1 data on polarized parton densities and higher twist effects is discussed. We demonstrate 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 which slightly decrease. We find also that the present inclusive DIS data cannot rule out a negative polarized and changing in sign gluon densities.

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