Session M3: New Results on the Polarized Glue in the Nucleon

3:30 PM–5:18 PM, Sunday, April 13, 2008
Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), - St. Louis E

Sponsoring Unit: DNP
Chair: Abhay Deshpande, Stony Brook University and RIKEN-BNL Research Center

Abstract: M3.00003 : Beller Lectureship Talk: Theoretical status and advances in understanding the role of polarized gluons

4:42 PM–5:18 PM

Preview Abstract

Author:

  Daniel de Florian
    (Universidad de Buenos Aires)

The contribution of quarks and gluons to the spin of the proton has been a puzzle since the first precise polarized measurements performed 20 years ago. In this talk, after summarizing the current knowledge on spin dependent parton distributions, I will present the results of a global QCD (NLO) analysis of all available polarized data. The inclusion of the recent proton-proton RHIC data, plus the DIS inclusive and semi- inclusive measurements allows attempting for a more precise determination of the gluon polarization. I will put special emphasis on the value obtained for the first moment of the gluonic distribution, the actual contribution of gluons to the spin of the nucleon.