Sea quark and gluon polarization in the nucleon

DANIEL DE FLORIAN; RODOLFO SASSOT,; GABRIELA NAVARRO,

Porto Alegre

Congreso; 1st Latin American Workshop on High Energy Phenomenology; 2007

We present results on the quark and gluon polarization in the nucleon obtained in a combined next to leading order analysis to the available inclusive and semi-inclusive polarized deep inelastic scattering data. Using the Lagrange multiplier method, we asses the uncertainty inherent to the extraction of the different spin dependent parton densities in a QCD global fit, and the impact of the increased set of semi-inclusive data now available.