Polarized Parton Densities and Higher Twist in the Light of the Recent CLAS and COMPASS data
Abstract
The impact of the recent very precise CLAS and COMPASS g1/F1 data on polarized parton densities and higher twist effects is discussed. We demonstrate that the low Q2 CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g1, while the large Q2 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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