Speaker
Dimitar Stamenov
(INRNE, Sofia)
Description
The results of a new NLO QCD analysis of the world data on inclusive
polarized DIS are presented. The very precise CLAS proton and
deuteron data, as well as the latest COMPASS data on the asymmetry
$A_1^d$ were included in the analysis, and the impact of these data
on polarized parton densities and higher twist effects has been
studied. It is demonstrated that the low Q^2 CLAS data improve
essentially our knowledge of higher twist corrections to the spin
structure function g_1, while the large Q^2 COMPASS data influence
mainly the strange quark density. It is also shown that a negative
polarized gluon density, or one that changes a sign as a function
of x, cannot be ruled out on the basis of the present DIS data.
Author
Dimitar Stamenov
(INRNE, Sofia)
