Eur. Phys. J. Special Topics 162, 19-24 (2008)
https://doi.org/10.1140/epjst/e2008-00770-3

Recent results on polarized PDFs and higher twist

¹ Imperial College London, Prince Consort Road, London SW7 2BW, UK
² JINR, Bogoliubov Laboratory of Theoretical Physics, 141980 Dubna, Russia
³ Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Blvd. Tsarigradsko Chaussee 72, Sofia 1784, Bulgaria

Corresponding author: sidorov@theor.jinr.ru

Abstract

The impact of the recent very precise CLAS and COMPASS data on polarized parton densities and higher twist effects is discussed. It is demonstrated 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. 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.