Impact of CLAS and COMPASS data on Polarized Parton Densities and Higher Twist
Abstract
We have re-analyzed the world data on inclusive polarized DIS including the very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry A1d, and have studied the impact of these data on polarized parton densities and higher twist effects. 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 density. In our new analysis we find that a negative polarized gluon density, or one that changes sign as a function of x, cannot be ruled out from the present DIS data.
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